{"title":"Yamaha CV55ELF Outboard Parts - All Years \u0026 Models","description":"\u003c!-- AUTO:LEAF_INDEX:START --\u003e\n\u003cnav class=\"breadcrumb\" style=\"font-size:14px;color:#555;margin-bottom:16px;\"\u003e← Browse: \u003ca href=\"\/collections\/yamaha-outboard-motor-parts\"\u003eYamaha Parts\u003c\/a\u003e\u003c\/nav\u003e\n\u003ch2\u003eYamaha CV55ELF Outboard Parts Catalog\u003c\/h2\u003e\n\u003cp\u003eFind quality replacement and aftermarket parts for your \u003cstrong\u003eYamaha CV55ELF\u003c\/strong\u003e outboard motor. Select your specific year and serial number range below.\u003c\/p\u003e\n\u003ch3\u003eBrowse by Year \u0026amp; Model (2 variants)\u003c\/h3\u003e\n\u003cul class=\"model-list\"\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/yamaha-cv55elf-1989\"\u003eCV55ELF 1989\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/yamaha-cv55elf-1990\"\u003eCV55ELF 1990\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- AUTO:LEAF_INDEX:END --\u003e","products":[{"product_id":"water-pump-impeller-for-yamaha-40-50-55-60-70-hp-6h3-44352-01","title":"6H3-44352 Water Pump Impeller for Yamaha 40 50 60 70 T50 T60 C40 C50 C55 C60 C70 E60 P40 P50 P60 F40A F40C F45A F50A F50B F50F FT50B FT50C FT50G F60A F60C FT60B FT60D F70A | JLM Marine","description":"\u003ch2\u003eWater Pump Impeller for Yamaha 40-70 HP Outboard Motors – Replaces 6H3-44352\u003c\/h2\u003e\n\n\u003cp\u003eThis high-quality water pump impeller is designed for Yamaha 2-stroke and 4-stroke outboard engines ranging from \u003cstrong\u003e40 HP to 70 HP\u003c\/strong\u003e. It ensures reliable cooling system performance across a wide range of models, including T50, T60, C40, C50, C55, C60, C70, E60, P40, P50, P60, F40A, F40C, F45A, F50A, F50B, F50F, FT50B, FT50C, FT50G, F60A, F60C, FT60B, FT60D, and F70A series engines.\u003c\/p\u003e\n\n\u003cp\u003eThis impeller directly replaces Yamaha OEM part numbers \u003cstrong\u003e6H3-44352\u003c\/strong\u003e, \u003cstrong\u003e6H3-44352-01\u003c\/strong\u003e, and \u003cstrong\u003e697-44352-00\u003c\/strong\u003e, providing a dependable aftermarket solution for maintaining your outboard's water pump system.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eFits both 2-stroke and 4-stroke Yamaha outboards from 40 HP to 70 HP\u003c\/li\u003e\n\u003cli\u003eDirect replacement for multiple OEM part numbers\u003c\/li\u003e\n\u003cli\u003eEssential component for proper engine cooling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6H3-44352\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6H3-44352-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e697-44352-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6H3-44352-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e697-44352-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e18-3069\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40, 50, P50, P60\u003c\/td\u003e\n\u003ctd\u003e40-60 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e~96\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT50, T60\u003c\/td\u003e\n\u003ctd\u003e50-60 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e97~\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40, C40, 40V, 40Y, P40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e97~\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e50, C50, 50G, 50H, 55B, Pro50, P50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e97~\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55\u003c\/td\u003e\n\u003ctd\u003e55 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e90~91\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eE60, 60, C60, P60, 60F\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e97~03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e70, 70B, C70\u003c\/td\u003e\n\u003ctd\u003e70 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e97~03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40A, F40C, F45A\u003c\/td\u003e\n\u003ctd\u003e40-45 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF50A, F50B, F50F, FT50B, FT50C, FT50G\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF60A, F60C, FT60B, FT60D\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF70A\u003c\/td\u003e\n\u003ctd\u003e70 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1995-2004\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1997-2002\u003c\/td\u003e\n\u003ctd\u003e3-Cyl.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999\u003c\/td\u003e\n\u003ctd\u003e4-Cyl.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999\u003c\/td\u003e\n\u003ctd\u003e2.6L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eP40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1998\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1995-2004\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1999-2001\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999-2003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eP50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1995-1996\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT50\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1996-2002\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55\u003c\/td\u003e\n\u003ctd\u003e55 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1991-1994\u003c\/td\u003e\n\u003ctd\u003eDrive I \u0026amp; II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV55\u003c\/td\u003e\n\u003ctd\u003e55 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003eDrive I \u0026amp; II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC60\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1996-2001\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eE60\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1995-2000\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF60\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002-2003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eP60\u003c\/td\u003e\n\u003ctd\u003e60 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1991-1999\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e70 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e1984-2002\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC70\u003c\/td\u003e\n\u003ctd\u003e70 HP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2000-2001\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e6H3-44352, 6H3-44352-01, 697-44352-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eYamaha Outboard Water Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible HP Range\u003c\/td\u003e\n\u003ctd\u003e40-70 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Stroke\u003c\/td\u003e\n\u003ctd\u003e2-Stroke \u0026amp; 4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Outboard Water Pump Impeller\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the fuel line and ensure the engine is completely off and cool before beginning work.\u003c\/li\u003e\n\u003cli\u003eRemove the lower unit from the outboard motor following your engine's service manual instructions.\u003c\/li\u003e\n\u003cli\u003eLocate and remove the water pump housing, typically secured by several bolts.\u003c\/li\u003e\n\u003cli\u003eCarefully extract the old impeller from the pump housing, noting its orientation and direction of the vanes.\u003c\/li\u003e\n\u003cli\u003eInspect the pump housing and plate for cracks, wear, or debris; clean thoroughly if necessary.\u003c\/li\u003e\n\u003cli\u003eApply a thin coat of marine-grade grease to the new impeller vanes and inside the pump housing.\u003c\/li\u003e\n\u003cli\u003eInstall the new impeller with the vanes oriented in the correct rotation direction (usually matching the old impeller's position).\u003c\/li\u003e\n\u003cli\u003eReassemble the water pump housing, ensuring all seals and gaskets are properly seated.\u003c\/li\u003e\n\u003cli\u003eReattach the lower unit to the outboard motor, tightening all bolts to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReconnect the fuel line and perform a test run in a water tank or on the water to verify proper water flow from the tell-tale.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this impeller fits my specific Yamaha engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Cross-reference your engine model, horsepower, and year with the compatibility table above. Additionally, verify your original OEM part number matches 6H3-44352, 6H3-44352-01, or 697-44352-00. If you're unsure, consult your engine's service manual or use the Yamaha serial number guide linked above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Most manufacturers recommend replacing the impeller every 2-3 years or every 200-300 hours of operation, whichever comes first. If you frequently operate in sandy or debris-filled water, more frequent replacement may be necessary.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my impeller is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include reduced or no water flow from the tell-tale (indicator stream), engine overheating, steam from the engine, or a decrease in cooling system performance. Inspect the impeller immediately if you notice any of these signs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this impeller myself, or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: If you have basic mechanical skills and the proper tools, you can replace the impeller yourself by following the installation guide and your engine's service manual. However, professional installation is recommended to ensure safety and optimal performance, especially if you're unfamiliar with outboard service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket impellers?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50469081809209,"sku":"17IY002","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_for_Yamaha_40_50_55_60_70_HP__6H3-44352-01_-_JLM_MARINE-8288624.png?v=1755252410"},{"product_id":"water-pump-impeller-kit-for-yamaha-25-to-70-hp-663-44311-02","title":"Water Pump Impeller Kit – Fits Yamaha 25-70 HP (Replaces 663-44311-02)","description":"\u003ch2\u003eWater Pump Impeller Kit – Fits Yamaha 25-70 HP (Replaces 663-44311-02)\u003c\/h2\u003e\n\u003cp\u003eThis water pump impeller service kit is designed for a wide range of Yamaha 2-stroke and 4-stroke outboard engines, from 25 HP to 70 HP. It provides the necessary components for repairing or rebuilding the engine's water pump, a critical part of the cooling system.\u003c\/p\u003e\n\u003cp\u003eThis assembly is a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring broad compatibility with various models produced between 1984 and 2000.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Drop-in replacement for the original water pump assembly.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Manufacturing:\u003c\/strong\u003e Produced in an ISO9002 certified facility to meet or exceed OEM specifications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes a new impeller, housing insert, gaskets, plate, and bolts required for a full service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003ePart Number\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663-44311-00\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02-00\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663-44311-0200\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663-W0078-A0-00\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e663W0078A000\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6H4-W0078-A0-00\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6H4W0078A000\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6J8-44311-00\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6J84431100\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eSierra\u003c\/td\u003e\n                \u003ctd\u003e18-3408\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n                \u003ctd\u003e46-81416T\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eAftermarket\u003c\/td\u003e\n                \u003ctd\u003eAM663-44311-02\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eAftermarket\u003c\/td\u003e\n                \u003ctd\u003eMAL9-43255\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eYamaha 2-Stroke Engines\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003eModel\u003c\/th\u003e\n                \u003cth\u003eRated HP\u003c\/th\u003e\n                \u003cth\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eYears\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\u003c\/th\u003e\n                \u003cth\u003eNotes\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e25B\/BETO\u003c\/td\u003e\n                \u003ctd\u003e25\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e40N\/H\/E\u003c\/td\u003e\n                \u003ctd\u003e40\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e40\u003c\/td\u003e\n                \u003ctd\u003e40\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1984–1994\u003c\/td\u003e\n                \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n                \u003ctd\u003e6H4 code models\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e48\u003c\/td\u003e\n                \u003ctd\u003e48\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1995–2000\u003c\/td\u003e\n                \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n                \u003ctd\u003e6H4 code models\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e50G\/GEO\/GETO\u003c\/td\u003e\n                \u003ctd\u003e50\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e50D\u003c\/td\u003e\n                \u003ctd\u003e50\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e50\u003c\/td\u003e\n                \u003ctd\u003e50\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1984–1994\u003c\/td\u003e\n                \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n                \u003ctd\u003e6H4 code models\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e55B\/BET\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003eE55CMH\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003eC55\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1990–1995\u003c\/td\u003e\n                \u003ctd\u003e663-W0078-A0, 670-W0078-A0\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003eCV55\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1989\u003c\/td\u003e\n                \u003ctd\u003e663-W0078-A0\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1989–1995\u003c\/td\u003e\n                \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n                \u003ctd\u003e6H4 code models\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e60FEO\/FETO\/FEDO\u003c\/td\u003e\n                \u003ctd\u003e60\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e60BE\/BEM\/BET\u003c\/td\u003e\n                \u003ctd\u003e60\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e70CE\u003c\/td\u003e\n                \u003ctd\u003e70\u003c\/td\u003e\n                \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003eYamaha 4-Stroke Engines\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003eModel\u003c\/th\u003e\n                \u003cth\u003eRated HP\u003c\/th\u003e\n                \u003cth\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eYears\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\u003c\/th\u003e\n                \u003cth\u003eNotes\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e55C\u003c\/td\u003e\n                \u003ctd\u003e55\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1990\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e60C\u003c\/td\u003e\n                \u003ctd\u003e60\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003e663-44311-02\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eSpecification\u003c\/th\u003e\n            \u003cth\u003eValue\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eWater Pump Impeller Kit\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eDrop-in replacement\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eOther Technical Attributes\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eISO9002 certified manufacturing\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x Water Pump Gasket (\u003cstrong\u003e663-44315-A0-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Insert (\u003cstrong\u003e663-44322-00-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Outer Plate (\u003cstrong\u003e663-44323-00-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Gasket (\u003cstrong\u003e663-44324-A0-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Seal Damper 2 (\u003cstrong\u003e663-44366-00-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller (\u003cstrong\u003e6H3-44352-00-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Woodruff Key (\u003cstrong\u003e90280-03024-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e2 x Bolts (\u003cstrong\u003e97095-08045-00\u003c\/strong\u003e)\u003c\/li\u003e\n    \u003cli\u003e2 x Bolts (\u003cstrong\u003e97095-08055-00\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Disconnect the engine's battery and ensure the engine is off and cool.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAccess the Pump:\u003c\/strong\u003e Remove the lower unit (gearcase) from the outboard motor by unbolting it.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDisassemble Housing:\u003c\/strong\u003e Carefully unbolt and remove the water pump housing to expose the old impeller.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNote Old Impeller:\u003c\/strong\u003e Pay close attention to the orientation of the impeller vanes before removing it.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Inspect:\u003c\/strong\u003e Thoroughly clean the inside of the pump housing and inspect it for any cracks, scoring, or warping.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstall New Components:\u003c\/strong\u003e Install the new gaskets, plate, and impeller from the kit. Ensure the impeller vanes are oriented correctly (typically clockwise).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReassemble Pump:\u003c\/strong\u003e Securely fasten the water pump housing, tightening the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReinstall Lower Unit:\u003c\/strong\u003e Re-attach the lower unit to the outboard motor.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTest Operation:\u003c\/strong\u003e Connect a water supply (\"earmuffs\" or by submerging the unit) and run the engine at idle to confirm a steady stream of water from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my specific Yamaha engine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: First, check your engine's model and year against the \"Compatible Engine Models\" table above. This kit replaces several OEM part numbers, including \u003cstrong\u003e663-44311-02\u003c\/strong\u003e and \u003cstrong\u003e6H4-W0078-A0-00\u003c\/strong\u003e. For further verification, we recommend using the \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e and reviewing the diagrams in the \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Catalog\u003c\/a\u003e to match the parts exactly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the common signs of a failing water pump impeller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The most common indicators include the engine overheating, a weak or non-existent water stream from the \"tell-tale\" cooling outlet, or discovering the old impeller is dry, brittle, cracked, or has missing vanes during an inspection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the water pump impeller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: As a general rule, it is recommended to inspect the impeller annually and replace it every 1-2 years or after 100-200 hours of operation. Frequent use in saltwater or sandy\/silty water may require more frequent replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50475698716985,"sku":"23KY087","price":54.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Yamaha_25_to_70_HP_663-44311-02_-_JLM_MARINE-8288881.jpg?v=1754991546"},{"product_id":"water-pump-impeller-kit-for-yamaha25-to-70-hp-663-44311-02","title":"Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663-44311-02)","description":"\n\u003ch2\u003eWater Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards\u003c\/h2\u003e\n\u003cp\u003eThis water pump impeller kit is a comprehensive solution for rebuilding the water pump assembly on Yamaha outboard motors from 25 to 70 horsepower. It is engineered to restore the cooling system to its original performance, preventing engine overheating and ensuring long-term reliability.\u003c\/p\u003e\n\u003cp\u003eThis kit directly replaces Yamaha OEM part numbers: \u003cstrong\u003e663-W0078-01\u003c\/strong\u003e, \u003cstrong\u003e663-W0078-A0\u003c\/strong\u003e, \u003cstrong\u003e6H3-W0078-02-00\u003c\/strong\u003e, and \u003cstrong\u003e6H3-W0078-A0-00\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Designed for Yamaha 2-Stroke outboards from 25 HP to 70 HP (1984–2005).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Assembly:\u003c\/strong\u003e Includes all necessary components shown in the detailed parts list for a full water pump service.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Installs directly as a replacement for the original factory components without modification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eOEM Part No.\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC-55\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1995\u003c\/td\u003e\n\u003ctd\u003e663-W0078-01, 663-W0078-A0\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV-55\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003e663-W0078-01, 663-W0078-A0\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC-60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–2001\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC-70\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2001\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eP-60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–1999\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT-50\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–2001, 2003, 2005\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT-60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003–2005\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–2003\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-02-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT50\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-A0-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55 (Drive 2)\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1994\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-A0-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV55 (Drive 2)\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-A0-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eP60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-A0-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984–1991\u003c\/td\u003e\n\u003ctd\u003e6H3-W0078-A0-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984–1994\u003c\/td\u003e\n\u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1994\u003c\/td\u003e\n\u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003ePro 50\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1994\u003c\/td\u003e\n\u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWater Pump Impeller Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther Technical Attributes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaintains proper cooling water circulation for outboard motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x Cartridge Insert (663-44322-00-00)\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 x Impeller (6H3-44352-00-00)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket (663-44315-A0-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Outer Plate (663-44323-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Gasket (663-44324-A0-00)\u003c\/li\u003e\n    \u003cli\u003e2 x Bolts (97095-08055-00)\u003c\/li\u003e\n    \u003cli\u003e2 x Bolts (97095-08045-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Seal Damper 2 (663-44366-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Woodruff Key (90280-03M03-00)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n    \u003cli\u003eDrain the lower unit gear oil.\u003c\/li\u003e\n    \u003cli\u003eRemove the lower unit by unbolting it from the midsection.\u003c\/li\u003e\n    \u003cli\u003eRemove the old water pump housing bolts and lift the housing off.\u003c\/li\u003e\n    \u003cli\u003eTake note of the old components and remove the old impeller, gaskets, and plates.\u003c\/li\u003e\n    \u003cli\u003eClean all mating surfaces thoroughly.\u003c\/li\u003e\n    \u003cli\u003eInstall the new gaskets, plates, impeller, and key from the kit.\u003c\/li\u003e\n    \u003cli\u003eLubricate the inside of the housing and the new impeller with a marine-safe lubricant.\u003c\/li\u003e\n    \u003cli\u003eReinstall the water pump housing and torque the bolts to the manufacturer's specification.\u003c\/li\u003e\n    \u003cli\u003eReattach the lower unit, refill the gear oil, and reconnect the battery.\u003c\/li\u003e\n    \u003cli\u003eStart the engine and verify water is discharging from the tell-tale port.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my specific engine?\u003c\/strong\u003e\u003cbr\u003e\nA: The surest method is to check your original part number against the ones listed in this description. You can also consult our \u003cstrong\u003eCompatible Engine Models\u003c\/strong\u003e table and use the Yamaha Serial Number Guide to verify your motor's model and year.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the symptoms of a failing water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Common signs include the engine overheating at idle or low speeds, a weak or non-existent stream from the \"tell-tale\" water outlet, or a high engine temperature alarm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: As a general rule, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the complete water pump housing included?\u003c\/strong\u003e\u003cbr\u003e\nA: This is an impeller repair kit and does not include the main pump housing. It is designed to rebuild your existing housing assembly with all new wear parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50476156289337,"sku":"17KY010","price":46.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Yamaha25_to_70_HP_663-44311-02_-_JLM_MARINE-8288992.jpg?v=1755252275"},{"product_id":"water-pump-impeller-kit-for-yamaha-25-to-70-hp-663-44311-2","title":"Water Pump Housing – Fits Yamaha 55HP C55 Outboards (Replaces 663-44311-02-00)","description":"\n\u003ch2\u003eWater Pump Housing – Fits Yamaha 55HP C55 Outboards (Replaces 663-44311-02-00)\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket water pump housing is designed for Yamaha 2-Stroke 55HP (C55) outboard models manufactured between 1991 and 1994. It serves as a direct replacement, ensuring proper fit and function for cooling system repairs.\u003c\/p\u003e\n\u003cp\u003eIt directly replaces Yamaha OEM part number \u003cstrong\u003e663-44311-02-00\u003c\/strong\u003e and is interchangeable with aftermarket part numbers from Sierra (9-43255) and GLM (12446).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Direct OEM replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Built to meet or exceed original equipment specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent:\u003c\/strong\u003e This is a single housing component. The complete water pump repair kit is sold separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e663-44311-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e9-43255\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e12446\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eOEM Part No.\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991-1994\u003c\/td\u003e\n\u003ctd\u003e663-44311-02-00\u003c\/td\u003e\n\u003ctd\u003eUsed with water pump kit 663-W0078-00\/01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eE48\u003c\/td\u003e\n\u003ctd\u003e48\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e663-44311-02-00\u003c\/td\u003e\n\u003ctd\u003eMentioned in Amazon listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eOutboard Water Pump Housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cp\u003eThis is a single component part. \u003cspan style=\"color:red;\"\u003eThe water pump housing is sold separately and does not include a complete repair kit.\u003c\/span\u003e\u003c\/p\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect Power:\u003c\/strong\u003e Start by disconnecting the battery terminals to prevent electrical accidents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess the Lower Unit:\u003c\/strong\u003e Drain the gearcase oil from the lower unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove Lower Unit:\u003c\/strong\u003e Unbolt and carefully detach the lower unit from the outboard's midsection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove Old Housing:\u003c\/strong\u003e Locate the water pump assembly and unbolt the old housing to remove it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect Components:\u003c\/strong\u003e Check the impeller, wear plate, and gaskets (not included) for wear or damage. Replace them if necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean Surfaces:\u003c\/strong\u003e Thoroughly clean the mounting surfaces where the new housing will sit to ensure a perfect seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall New Housing:\u003c\/strong\u003e Position the new water pump housing and secure it by tightening the bolts to the manufacturer's recommended torque specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReassemble:\u003c\/strong\u003e Reinstall the lower unit onto the outboard motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefill and Test:\u003c\/strong\u003e Refill the gearcase with the correct type and amount of lube. Reconnect the battery and run the engine on a water supply to check for proper cooling system operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this housing fits my Yamaha engine?\u003c\/strong\u003e\u003cbr\u003eThis housing is confirmed to fit Yamaha C55 models from 1991-1994 and is listed for E48 models. The most reliable method is to verify that your existing part number is \u003cstrong\u003e663-44311-02-00\u003c\/strong\u003e. Use our compatibility table and cross-reference guides to be certain.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a complete water pump kit?\u003c\/strong\u003e\u003cbr\u003eNo, this listing is for the \u003cstrong\u003ewater pump housing only\u003c\/strong\u003e. It is a single component and does not include the impeller, gaskets, or other parts found in a complete repair kit (sold separately).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are common signs of a failed water pump housing?\u003c\/strong\u003e\u003cbr\u003eKey indicators include the engine overheating, a noticeably weak or non-existent water stream from the \"tell-tale\" outlet, or discovering visible cracks, warping, or corrosion on the housing during an inspection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003eThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003eWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003eThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50485469380921,"sku":"SIE-17KY010","price":46.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Yamaha_25_to_70_HP_663-44311-02_-_JLM_MARINE-8289193.jpg?v=1755252184"},{"product_id":"thermostat-143-f-62-c-for-yamaha-2-str-9-9-55-hp-6f5-12411-01-6f5-12411-02-6f5-12411","title":"6F5-12411-03 Thermostat Kit for Yamaha 25D | JLM Marine","description":"\u003ch2\u003eThermostat Kit for Yamaha 25D – 6F5-12411-03\u003c\/h2\u003e\n\n\u003cp\u003eThis thermostat kit is designed for \u003cstrong\u003eYamaha 2-stroke 25D outboard engines\u003c\/strong\u003e, providing reliable temperature regulation to protect your motor from overheating. It includes all essential components for a complete thermostat service, ensuring proper cooling system performance and engine longevity.\u003c\/p\u003e\n\n\u003cp\u003eThis kit directly replaces multiple Yamaha OEM part numbers, including \u003cstrong\u003e6F5-12411-01\u003c\/strong\u003e, \u003cstrong\u003e6F5-12411-02\u003c\/strong\u003e, and \u003cstrong\u003e6F5-12411-03\u003c\/strong\u003e, along with compatible housing gaskets. It offers a cost-effective aftermarket solution for maintaining your outboard's cooling system.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eComplete service kit with thermostat, seal, and housing gasket\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for Yamaha OEM part numbers\u003c\/li\u003e\n  \u003cli\u003eDesigned for Yamaha 2-stroke 25D outboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6F5-12411-01\u003c\/td\u003e\n      \u003ctd\u003eOutboard Thermostat\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6F5-12411-02\u003c\/td\u003e\n      \u003ctd\u003eOutboard Thermostat\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6F5-12411-03\u003c\/td\u003e\n      \u003ctd\u003eOutboard Thermostat\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e61A-12414-A0\u003c\/td\u003e\n      \u003ctd\u003eThermostat Housing Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6H4-12414-00\u003c\/td\u003e\n      \u003ctd\u003eThermostat Housing Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6H4-12414-A0\u003c\/td\u003e\n      \u003ctd\u003eThermostat Housing Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6J8-12414-A0\u003c\/td\u003e\n      \u003ctd\u003eThermostat Housing Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n      \u003cth\u003eStroke\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e25D\u003c\/td\u003e\n      \u003ctd\u003e2-Stroke\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e6F5-12411-03\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFits Brand\u003c\/td\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eEngine Type\u003c\/td\u003e\n      \u003ctd\u003e2-Stroke Outboard\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Models\u003c\/td\u003e\n      \u003ctd\u003e25D\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis complete thermostat service kit includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Outboard Thermostat\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Thermostat Seal\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1 × Thermostat Housing Gasket\u003c\/strong\u003e \u003cspan style=\"color:red;\"\u003e(Gasket color may be black or blue, but the material is the same)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n  \u003cli\u003eLocate the thermostat housing on your Yamaha 25D outboard, typically on the cylinder head or mid-section.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the thermostat housing cover using the appropriate socket or wrench.\u003c\/li\u003e\n  \u003cli\u003eCarefully lift off the housing cover and remove the old thermostat and gasket. Inspect the housing for corrosion or damage.\u003c\/li\u003e\n  \u003cli\u003eClean all mating surfaces thoroughly, removing old gasket material and debris to ensure a proper seal.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat seal onto the thermostat, ensuring it seats correctly in the groove.\u003c\/li\u003e\n  \u003cli\u003ePosition the new thermostat into the housing with the temperature-sensing element (spring side) facing the correct direction as indicated by the old unit.\u003c\/li\u003e\n  \u003cli\u003ePlace the new thermostat housing gasket onto the housing, aligning all bolt holes properly.\u003c\/li\u003e\n  \u003cli\u003eReinstall the thermostat housing cover, ensuring proper alignment with the gasket.\u003c\/li\u003e\n  \u003cli\u003eTighten the housing bolts in a crisscross pattern to the manufacturer's recommended torque specification to prevent warping.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and start the engine, allowing it to reach operating temperature while monitoring for leaks.\u003c\/li\u003e\n  \u003cli\u003eCheck coolant levels and top off if necessary, then verify proper engine temperature operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this thermostat kit fits my Yamaha outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify that your engine is a Yamaha 2-stroke 25D model. Cross-reference your current thermostat part number with the listed OEM numbers (6F5-12411-01, 6F5-12411-02, 6F5-12411-03) to ensure compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my outboard thermostat?\u003c\/strong\u003e\u003cbr\u003e\nA: Thermostats should be inspected annually and replaced every 2-3 years or when you notice overheating issues, inconsistent temperature readings, or visible corrosion. Regular replacement prevents costly engine damage from cooling system failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my thermostat is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include engine overheating, running too cool (prolonged warm-up), steam from the engine, reduced performance, or the overheat alarm activating. If you experience any of these, inspect and replace the thermostat immediately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why does the gasket color vary between black and blue?\u003c\/strong\u003e\u003cbr\u003e\nA: The gasket color may vary by production batch, but both black and blue gaskets are manufactured from the same material specification and provide identical sealing performance. Use whichever color is supplied in your kit with confidence.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50578603082041,"sku":"23TH015","price":31.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/23TH015_1_1a846d8b-6d3f-400f-bdc0-29b6b79a2d9e.jpg?v=1755251608"},{"product_id":"thermostat-with-gasket-for-yamaha-2-str-9-9-55-hp-6f5-12411-01-6f5-12411-02-143-f-62-c-6f5-12411-03","title":"Yamaha Outboard Thermostat 143°F\/62°C – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01\/6F5-12411-02\/6F5-12411-03)","description":"\u003ch2\u003eYamaha Outboard Thermostat 143°F\/62°C – Fits Yamaha 2-Stroke 9.9-55 HP\u003c\/h2\u003e\n\u003cp\u003eThis replacement thermostat is designed for a wide range of Yamaha 2-Stroke outboard engines from 9.9 HP to 55 HP, specifically for models manufactured between 1986 and 1997. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yamaha OEM part numbers \u003cstrong\u003e6F5-12411-01-00\u003c\/strong\u003e, \u003cstrong\u003e6F5-12411-02-00\u003c\/strong\u003e, and \u003cstrong\u003e6F5-12411-03-00\u003c\/strong\u003e, as well as Sierra part number \u003cstrong\u003e18-3625\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eEngineered to operate at \u003cstrong\u003e143°F (62°C)\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003eDirect fitment into the original thermostat housing for straightforward installation.\u003c\/li\u003e\n    \u003cli\u003eComplete kit includes the thermostat, O-ring, and gasket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eBrand\u003c\/th\u003e\n            \u003cth\u003ePart Number\u003c\/th\u003e\n            \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n            \u003ctd\u003eSupersedes 6F5-12411-02-00, 6F5-12411-01-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003e6F5-12411-02-00\u003c\/td\u003e\n            \u003ctd\u003eSuperseded by 6F5-12411-03-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003e6F5-12411-01-00\u003c\/td\u003e\n            \u003ctd\u003eSuperseded by 6F5-12411-03-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSierra\u003c\/td\u003e\n            \u003ctd\u003e18-3625\u003c\/td\u003e\n            \u003ctd\u003eAftermarket replacement\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eBrand\u003c\/th\u003e\n            \u003cth\u003eModel\u003c\/th\u003e\n            \u003cth\u003eRated HP\u003c\/th\u003e\n            \u003cth\u003eStroke\u003c\/th\u003e\n            \u003cth\u003eYears\u003c\/th\u003e\n            \u003cth\u003eOEM Part No.\u003c\/th\u003e\n            \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9, 9.9EL, 9.9ES\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9L, 9.9S\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9M\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e15, 15EL, 15ES\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e15L, 15S\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25EL\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ML\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25MS\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV25EL, CV25EM\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC30EL\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1992\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV30EL\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40EL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40MS, C40PL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40ML\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV40EL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55EL\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV55EL\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n\u003ctd\u003eSupersedes 6F5-12411-01-00, 6F5-12411-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eSpecification\u003c\/th\u003e\n            \u003cth\u003eValue\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eProduct Type\u003c\/td\u003e\n            \u003ctd\u003eMarine Outboard Thermostat\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eInstallation\u003c\/td\u003e\n            \u003ctd\u003eDirect fit into thermostat housing\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eFuel Type\u003c\/td\u003e\n            \u003ctd\u003eGasoline\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eOperating Temperature\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003e143°F (62°C)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eOther Technical Attributes\u003c\/td\u003e\n            \u003ctd\u003ePart of engine cooling system\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x 62°C \/ 143°F Outboard Thermostat (\u003cspan style=\"color:red;\"\u003e6F5-12411-03-00\u003c\/span\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x O-ring\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (682-12414-A1)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Ensure the engine is off and cool, and disconnect the battery.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLocate Housing:\u003c\/strong\u003e Find the thermostat housing, typically located on the cylinder head or engine block.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDrain Coolant:\u003c\/strong\u003e Place a drain pan under the housing to catch any spilling coolant.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRemove Cover:\u003c\/strong\u003e Carefully unbolt and remove the thermostat housing cover.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eExtract Old Parts:\u003c\/strong\u003e Remove the old thermostat, O-ring, and gasket. Note the orientation of the thermostat.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClean Surfaces:\u003c\/strong\u003e Thoroughly clean the mating surfaces of the housing and cover, removing any old gasket material or corrosion.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstall New Parts:\u003c\/strong\u003e Place the new thermostat, gasket, and O-ring into the housing, ensuring correct alignment.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReassemble:\u003c\/strong\u003e Reattach the housing cover and tighten the bolts to the manufacturer's recommended torque specifications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFinal Checks:\u003c\/strong\u003e Reconnect the battery, start the engine, and carefully check for leaks as it warms up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this thermostat fits my engine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The surest way is to check the compatibility list on this page. Please review the \"Compatible Engine Models\" table to verify that your Yamaha engine’s model and year range are listed. This part is a confirmed replacement for OEM numbers 6F5-12411-01, 6F5-12411-02, and 6F5-12411-03.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the symptoms of a failing outboard thermostat?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Common signs of a bad thermostat include the engine overheating (running too hot) or running too cold (not reaching operating temperature). You might notice an alarm from your controls, steam from the engine, or poor performance at idle. The thermostat can fail by being stuck open or stuck closed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: I've seen other thermostats listed at 140°F. Why is this one 143°F?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This thermostat is manufactured to the precise OEM specification of \u003cstrong\u003e143°F (62°C)\u003c\/strong\u003e. While some aftermarket listings may round down to 140°F, our data from multiple technical sources confirms 143°F is the correct temperature for the listed Yamaha models, ensuring your engine operates in its designed temperature range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50579313983801,"sku":"24TH505","price":18.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/24TH505_1_d379df72-cd00-41d3-b470-838b53732997.jpg?v=1754990866"},{"product_id":"thermostat-143-f-62-c-with-gasket-for-yamaha-2-stroke-9-9-55-hp-6f5-12411-01-6f5-12411-02-6f5-12411-02","title":"Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03)","description":"\u003ch2\u003eThermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03)\u003c\/h2\u003e\n\u003cp\u003eThis thermostat is designed for a wide range of Yamaha 2-Stroke outboards from 9.9 to 55 HP, manufactured between 1986 and 1997. This includes specific models such as the 9.9\/15 HP (1986–1995), C25\/C30 (1990–1997), C40\/C55 (1990–1997), and the CV25\/CV30\/CV40\/CV55 series (1989–1990).\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yamaha parts 6F5-12411-01-00, 6F5-12411-02-00, and 6F5-12411-03-00, as well as aftermarket equivalents like Sierra Marine 18-3625 and Quicksilver 814554T01.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eIncludes one thermostat and one O-ring gasket for a complete installation.\u003c\/li\u003e\n    \u003cli\u003eEngineered for a precise \u003cstrong\u003e143°F (62°C)\u003c\/strong\u003e opening temperature.\u003c\/li\u003e\n    \u003cli\u003eDesigned for direct OEM replacement, ensuring a straightforward installation process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003ePart Number\u003c\/th\u003e\n                \u003cth\u003eSuperseded By\u003c\/th\u003e\n                \u003cth\u003eNotes\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6F5-12411-01-00\u003c\/td\u003e\n                \u003ctd\u003e6F5-12411-02-00\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6F5-12411-02-00\u003c\/td\u003e\n                \u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eYamaha\u003c\/td\u003e\n                \u003ctd\u003e6F5-12411-03-00\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003eCurrent\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eSierra Marine\u003c\/td\u003e\n                \u003ctd\u003e18-3625\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003eAftermarket\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eQuicksilver\u003c\/td\u003e\n                \u003ctd\u003e814554T01\u003c\/td\u003e\n                \u003ctd\u003e\u003c\/td\u003e\n                \u003ctd\u003eAftermarket\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eFor Mercury owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eYamaha 2-Stroke Outboards\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003eModel\u003c\/th\u003e\n                \u003cth\u003eRated HP\u003c\/th\u003e\n                \u003cth\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eYears\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\u003c\/th\u003e\n                \u003cth\u003eNotes\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9, 9.9EL, 9.9ES\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9L, 9.9S\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9M\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e15, 15EL, 15ES\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e15L, 15S\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25EL\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ML, C25MS\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV25EL, CV25EM\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC30EL\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1992\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV30EL\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40EL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40MS, C40PL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1997\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC40ML\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV40EL\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC55EL\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1995\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV55EL\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003e6F5-12411-01\/02\/03\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eMercury\/Mariner Compatibility (Crossover Application)\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003eModel\u003c\/th\u003e\n                \u003cth\u003eRated HP\u003c\/th\u003e\n                \u003cth\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eYears\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\u003c\/th\u003e\n                \u003cth\u003eNotes\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1979–1986\u003c\/td\u003e\n\u003ctd\u003e814554T01\u003c\/td\u003e\n\u003ctd\u003eCrossover application\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e15K, 20C, 25C\u003c\/td\u003e\n\u003ctd\u003e15-25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1998\u003c\/td\u003e\n\u003ctd\u003e814554T01\u003c\/td\u003e\n\u003ctd\u003eCrossover application\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e25K, 40C, K40, 40\u003c\/td\u003e\n\u003ctd\u003e25-40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1998\u003c\/td\u003e\n\u003ctd\u003e814554T01\u003c\/td\u003e\n\u003ctd\u003eCrossover application\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984–1985\u003c\/td\u003e\n\u003ctd\u003e814554T01\u003c\/td\u003e\n\u003ctd\u003eCrossover application\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eSpecification\u003c\/th\u003e\n            \u003cth\u003eValue\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eProduct Type\u003c\/td\u003e\n            \u003ctd\u003eThermostat\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eTemperature Rating\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003e62°C (143°F)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eInstallation\u003c\/td\u003e\n            \u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eFuel Type\u003c\/td\u003e\n            \u003ctd\u003eGasoline (Petrol)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eHousing Material\u003c\/td\u003e\n            \u003ctd\u003eHigh-grade corrosion-resistant metal\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eOperating Temperature\u003c\/td\u003e\n            \u003ctd\u003e62°C (143°F) opening temperature\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eWarranty\u003c\/td\u003e\n            \u003ctd\u003eManufacturer dependent (typically 1 year)\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x Thermostat (\u003cspan style=\"color:red;\"\u003eReplaces 6F5-12411-03-00\u003c\/span\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x O-ring Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eEnsure the engine is completely cool before starting work.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the negative battery cable to prevent accidental starting.\u003c\/li\u003e\n    \u003cli\u003eLocate the thermostat housing on the engine block. Place a drain pan below it to catch any coolant.\u003c\/li\u003e\n    \u003cli\u003eCarefully remove the bolts securing the housing cover. A light tap may be needed to break the seal.\u003c\/li\u003e\n    \u003cli\u003eRemove the old thermostat and gasket. Note the orientation of the thermostat for correct placement of the new one.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean the mating surfaces of the housing and its cover, removing all old gasket material.\u003c\/li\u003e\n    \u003cli\u003eInstall the new thermostat and O-ring gasket, ensuring the thermostat is seated correctly.\u003c\/li\u003e\n    \u003cli\u003eRe-install the housing cover and tighten the bolts evenly to the manufacturer-specified torque. Do not overtighten.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery cable.\u003c\/li\u003e\n    \u003cli\u003eStart the engine, let it warm up, and carefully check for any leaks around the thermostat housing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this thermostat fits my engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Check the \"Compatible Engine Models\" and \"Part Number Cross-Reference\" tables on this page. It is crucial to match your engine's model, year, and original part number to ensure correct fitment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs of a faulty thermostat?\u003c\/strong\u003e\u003cbr\u003e\nA: Common signs of a failing thermostat include the engine overheating at low speeds, the engine taking too long to reach its normal operating temperature, or an erratic temperature gauge reading.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a 60°C or 62°C thermostat?\u003c\/strong\u003e\u003cbr\u003e\nA: This thermostat is rated to open at \u003cstrong\u003e62°C (143°F)\u003c\/strong\u003e. While some OEM parts may vary slightly, this temperature is specified for optimal performance in the listed engine models.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50579318505785,"sku":"24TH506","price":22.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/24TH506_1_dc8cb029-c6d7-4a8c-81d4-6b8e022fcc5d.jpg?v=1754990858"}],"url":"https:\/\/jlmmarine.com\/collections\/yamaha-cv55elf-parts.oembed","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}