{"title":"Yamaha 50ETLK 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 50ETLK Outboard Parts Catalog\u003c\/h2\u003e\n\u003cp\u003eFind quality replacement and aftermarket parts for your \u003cstrong\u003eYamaha 50ETLK\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-50etlk-1984\"\u003e50ETLK 1984\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"\/collections\/yamaha-50etlk-1985\"\u003e50ETLK 1985\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- AUTO:LEAF_INDEX:END --\u003e","products":[{"product_id":"water-pump-impeller-kit-for-yamaha-40-50-hp-2-stroke-1994-05-f40-f50-f60-4-stroke-1996-63d-w0078-01","title":"Water Pump Impeller Kit – Fits Yamaha 40\/50\/60HP 2-Stroke \u0026 4-Stroke (Replaces 63D-W0078-01-00)","description":"\u003ch2\u003eWater Pump Impeller Kit – Fits Yamaha 40\/50\/60HP 2-Stroke \u0026amp; 4-Stroke (Replaces 63D-W0078-01-00)\u003c\/h2\u003e\n\u003cp\u003eThis water pump repair kit is designed for Yamaha outboard engines, containing all necessary components to service the water pump and restore proper cooling system function. It is compatible with a wide range of Yamaha 2-stroke and 4-stroke engines in the 40HP, 50HP, and 60HP categories.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for multiple Yamaha and Sierra part numbers, ensuring a precise fit and reliable performance for the specified engine models.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eFits Yamaha 2-Stroke (40HP, 50HP) and 4-Stroke (F40, F50, F60) models.\u003c\/li\u003e\n \u003cli\u003eIncludes a new housing, impeller, gaskets, and hardware for a complete rebuild.\u003c\/li\u003e\n \u003cli\u003eEngineered as a direct, ready-to-install replacement for the original assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\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\u003e\u003cstrong\u003e63D-W0078-01-00\u003c\/strong\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-00-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-02-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-03-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3415\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3434\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\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 Models\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 \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e40\/50\u003c\/td\u003e\n \u003ctd\u003e40-50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1994-2005\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003eYamaha 4-Stroke Models\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 \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40A, AE, AEL, AMH\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1999-2002\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40B\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2006-2015\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40CET\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2002\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40D, DE, HE\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2006-2015\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF50A, AE, TJR\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1997-2007\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF50DETL\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1995-2010\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF50F, FE, TR, TL\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2005-2012\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF50HED\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2013-2015\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF60A, AE, TL, TJR\u003c\/td\u003e\n \u003ctd\u003e60\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2002-2012\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF60B, FET\u003c\/td\u003e\n \u003ctd\u003e60\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2013-2015\u003c\/td\u003e\n \u003ctd\u003e63D-W0078-01-00\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 Repair 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 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\u003eIncludes housing and all necessary components for complete water pump rebuild\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e1 x Cartridge Insert (63D-44322-00-00)\u003c\/li\u003e\n \u003cli\u003e1 x \u003cspan style=\"color:red;\"\u003eImpeller (6H3-44352-00-00)\u003c\/span\u003e\n\u003c\/li\u003e\n \u003cli\u003e1 x Water Pump Housing Cover (63D-44312-00-00)\u003c\/li\u003e\n \u003cli\u003e1 x Cartridge Outer Plate (63D-44323-00-00)\u003c\/li\u003e\n \u003cli\u003e1 x O-Ring (93210-59MG7-00)\u003c\/li\u003e\n \u003cli\u003e1 x Water Pump Gasket (63D-44316-00-00)\u003c\/li\u003e\n \u003cli\u003e4 x Bolts With Washers (90119-08M15-00)\u003c\/li\u003e\n \u003cli\u003e1 x Water Seal Damper 2 (663-44366-00-00)\u003c\/li\u003e\n \u003cli\u003e1 x Woodruff Key (90280-03024-00)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Disconnect the battery and remove the spark plug wires to prevent accidental starting. Tilt the outboard motor up and secure it.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eAccess the Lower Unit:\u003c\/strong\u003e Remove the bolts securing the lower unit (gearcase) to the engine's midsection. Carefully lower the unit to access the water pump.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDisassemble the Pump:\u003c\/strong\u003e Remove the bolts holding the water pump housing cover. Take note of the position of all parts as you remove them.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eInspect and Remove Old Parts:\u003c\/strong\u003e Remove the old housing, impeller, gaskets, and wear plates. Clean all mating surfaces thoroughly.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eInstall New Components:\u003c\/strong\u003e Lightly lubricate the new impeller and housing interior with marine grease. Install the new Woodruff key, impeller (turning clockwise), O-rings, and gaskets as per the kit.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eReassemble and Test:\u003c\/strong\u003e Reassemble the water pump housing and torque bolts to manufacturer specifications. Reinstall the lower unit, reconnect controls, and test the engine in water to confirm a steady stream from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How can I be sure this kit fits my exact Yamaha model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The best way is to check the part number on your existing water pump housing or consult your engine's service manual. Cross-reference this number with those listed in our \"Part Number Cross-Reference\" table. Also, carefully check your model and year against our \"Compatible Engine Models\" list.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs of a failing water pump impeller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Common signs include an engine that is overheating, a weak or non-existent water stream from the \"tell-tale\" outlet port, and a dry, cracked, or brittle appearance of the old impeller upon inspection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should the water pump impeller be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: For preventative maintenance, 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: 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\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\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":50475127013689,"sku":"17KY011","price":27.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/17KY0111_6c1a8f88-f792-44e1-9e06-93c9d33949c1.jpg?v=1755252337"},{"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-yamaha-40-50hp-1984-1996-6h4-w0078-00","title":"Water Pump Impeller Kit – Fits Yamaha 40–50HP 2-Stroke Outboards (Replaces 6H4-W0078-00-00)","description":"\u003ch2\u003eWater Pump Impeller Kit – Fits Yamaha 40–50HP 2-Stroke Outboards (Replaces 6H4-W0078-00-00)\u003c\/h2\u003e\n\u003cp\u003eThis water pump impeller repair kit is designed for Yamaha 2-stroke outboards, including 40 HP models from 1984–1994 and various 50 HP models produced between 1984 and 1996. It provides all necessary components for a complete and reliable water pump service to maintain engine cooling performance.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yamaha OEM part numbers \u003cstrong\u003e6H4-W0078-00-00\u003c\/strong\u003e, \u003cstrong\u003e6H4-W0078-01-00\u003c\/strong\u003e, and \u003cstrong\u003e6H4-W0078-A0-00\u003c\/strong\u003e, ensuring a precise fit and straightforward installation.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Direct OEM-style replacement\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eImpeller Material:\u003c\/strong\u003e High-strength, heat-resistant neoprene for durability and consistent flow.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes a new impeller, wear plate, insert cup, gaskets, bolts, and other hardware for a full rebuild.\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\u003e6H4-W0078-00-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-01-00\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\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3429\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSouthMarine\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-A0\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSouthMarine\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00\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\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\u003eAll models\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-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eStandard models\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1984–1987\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00-00\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 Series 50\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1987–1990\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eP50 Series\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1995–1996\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00-00\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\u003eProduct Type\u003c\/td\u003e\n \u003ctd\u003eWater Pump Impeller Kit\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\u003eHousing Material\u003c\/td\u003e\n \u003ctd\u003eMetal\/Plastic composite\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eImpeller Material\u003c\/td\u003e\n \u003ctd\u003eNeoprene (heat-resistant, flexible)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHardware Material\u003c\/td\u003e\n \u003ctd\u003eStainless steel\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eGaskets\u003c\/td\u003e\n \u003ctd\u003eNon-asbestos fiber (OEM-compliant)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eBlade Count\u003c\/td\u003e\n \u003ctd\u003e6\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eWarranty\u003c\/td\u003e\n \u003ctd\u003e30 days (retailer dependent)\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 × Water Pump Impeller (6H4-44352-00)\u003c\/li\u003e\n \u003cli\u003e1 × Insert Cup (663-44322-00)\u003c\/li\u003e\n \u003cli\u003e1 × Wear Plate (663-44323-00)\u003c\/li\u003e\n \u003cli\u003e1 × Gasket (663-44315-A0)\u003c\/li\u003e\n \u003cli\u003e1 × Gasket (663-44316-A0)\u003c\/li\u003e\n \u003cli\u003e1 × Gasket (663-44324-A0)\u003c\/li\u003e\n \u003cli\u003e1 × Grommet (663-44366-00)\u003c\/li\u003e\n \u003cli\u003e2 × Bolts (97080-08045)\u003c\/li\u003e\n \u003cli\u003e2 × Bolts (97080-08055)\u003c\/li\u003e\n \u003cli\u003e1 × Woodruff Key (90280-03024)\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 battery and spark plug leads before beginning work.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDrain Gearcase Oil:\u003c\/strong\u003e Place a drain pan under the lower unit and remove the drain and vent screws to drain the gearcase oil.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eRemove Lower Unit:\u003c\/strong\u003e Unbolt the lower unit (gearcase) from the engine's midsection. Be prepared to support its weight.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eAccess the Pump:\u003c\/strong\u003e With the lower unit removed, unbolt and remove the water pump housing to access the impeller.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eRemove Old Components:\u003c\/strong\u003e Take out the old impeller, gaskets, wear plate, and insert cup. Note the orientation of the impeller vanes.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eClean and Inspect:\u003c\/strong\u003e Thoroughly clean all surfaces of the housing and lower unit. Check the housing for cracks, warping, or scoring.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eInstall New Parts:\u003c\/strong\u003e Install the new components from the kit. Lightly grease the new impeller and insert cup. Ensure the impeller vanes are oriented correctly (typically by turning the driveshaft clockwise during installation).\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eReassemble Pump:\u003c\/strong\u003e Secure the new water pump housing with the new gasket and bolts, tightening them to the manufacturer's specified torque.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eReattach Lower Unit:\u003c\/strong\u003e Reinstall the lower unit, ensuring the driveshaft and water tube align correctly.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eRefill Gearcase Oil:\u003c\/strong\u003e Pump fresh gearcase oil into the lower unit through the drain screw hole until it flows out of the vent hole. Reinstall the vent and drain screws.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFinal Checks:\u003c\/strong\u003e Reconnect the spark plug leads and battery. Start the engine using a water supply (flushing muffs) and verify that water is exiting the tell-tale port, indicating a working pump.\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 kit fits my engine?\u003c\/strong\u003e\u003cbr\u003e\nCheck your engine's model, HP, and year against the \"Compatible Engine Models\" table above. Cross-reference your existing part number with the numbers listed in the \"Part Number Cross-Reference\" section for confirmation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs of a failing water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nCommon signs include a weak or non-existent water stream from the \"tell-tale\" outlet, engine overheating alarms, or a melted water pump housing. The flexible neoprene impeller can become brittle and cracked over time, reducing its pumping efficiency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace the water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nFor preventative maintenance, it is recommended to inspect and\/or replace the water pump impeller every \u003cstrong\u003e100 operating hours or at least once a year\u003c\/strong\u003e, whichever comes first. This is especially important if you operate in saltwater or sandy\/silty conditions.\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","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50475704156473,"sku":"22KY026","price":36.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/22KY026_1_3d96c961-5dea-42e1-9da4-4db24678e1fe.jpg?v=1755252276"},{"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":"water-pump-impeller-kit-for-yamaha-40hp-50hp-2-stroke-6h4-w0078-00-00","title":"Water Pump Impeller Service Kit – Fits Yamaha 2-Stroke 40\/50 HP (Replaces 6H4-W0078-00)","description":"\u003ch2\u003eWater Pump Impeller Service Kit – Fits Yamaha 2-Stroke 40\/50 HP (Replaces 6H4-W0078-00)\u003c\/h2\u003e\n\u003cp\u003eThis water pump impeller service kit is designed for \u003cstrong\u003eYamaha 2-Stroke 40 HP (1995–2005) and 50 HP (1998–2009)\u003c\/strong\u003e outboard motors. It provides a reliable, direct-replacement solution for maintaining your engine’s cooling system.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for Yamaha part numbers \u003cstrong\u003e6H4-W0078-00, 6H4-W0078-00-00, 6H4-W0078-01-00, 6H4-W0078-A0-00\u003c\/strong\u003e, and Sierra part numbers \u003cstrong\u003e18-3408 \/ 18-3429\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eEngine placement: \u003cstrong\u003eLower Unit\u003c\/strong\u003e.\u003c\/li\u003e\n \u003cli\u003eThe impeller is constructed from high-quality, durable \u003cstrong\u003eNeoprene\u003c\/strong\u003e for optimal performance and longevity.\u003c\/li\u003e\n \u003cli\u003eEngineered to meet or exceed original equipment manufacturer (OEM) specifications for a precise fit and function.\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\u003e6H4-W0078-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-01-00\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\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3408\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3429\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 \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e40 HP\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1995-2005\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e50 HP\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998-2009\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eP50 (Pro Series)\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998-2009\u003c\/td\u003e\n \u003ctd\u003e6H4-W0078-00\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\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n \u003ctd\u003eWater Pump Impeller Service Kit\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n \u003ctd\u003eLower Unit\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n \u003ctd\u003eNeoprene (Impeller)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n \u003ctd\u003e0.25 kg (0.55 lb)\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\u003eOriginal Equipment Manufacturer (OEM) or OEM-compatible 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\u003cul\u003e\n \u003cli\u003e1 x Water Pump Impeller (\u003cspan style=\"color:red;\"\u003e6H4-44352-00\u003c\/span\u003e)\u003c\/li\u003e\n \u003cli\u003e1 x Wear Plate\u003c\/li\u003e\n \u003cli\u003e1 x Insert Cup\u003c\/li\u003e\n \u003cli\u003e1 x Water Pump Gasket\u003c\/li\u003e\n \u003cli\u003e1 x Key\u003c\/li\u003e\n \u003cli\u003e1 x Water Seal\u003c\/li\u003e\n \u003cli\u003e1 x \"O\"-Ring\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 propeller.\u003c\/li\u003e\n \u003cli\u003eDrain the gearcase oil from the lower unit.\u003c\/li\u003e\n \u003cli\u003eUnbolt and carefully lower the gearcase from the outboard's driveshaft housing.\u003c\/li\u003e\n \u003cli\u003eRemove the bolts securing the water pump housing cover.\u003c\/li\u003e\n \u003cli\u003eTake note of the old impeller's rotational orientation before removing it.\u003c\/li\u003e\n \u003cli\u003eRemove the old impeller, plate, cup, gaskets, and seals from the housing.\u003c\/li\u003e\n \u003cli\u003eClean all mounting surfaces thoroughly, removing any old gasket material or debris.\u003c\/li\u003e\n \u003cli\u003eInstall the new wear plate, gasket, and insert cup into the housing.\u003c\/li\u003e\n \u003cli\u003eSlide the new key and impeller onto the driveshaft. Apply a light coat of marine grease to the housing interior and ensure impeller vanes point in the correct rotational direction.\u003c\/li\u003e\n \u003cli\u003eReinstall the water pump housing and tighten bolts to the manufacturer's specified torque.\u003c\/li\u003e\n \u003cli\u003eReattach the lower unit to the driveshaft housing and refill the gearcase with new oil.\u003c\/li\u003e\n \u003cli\u003eReinstall the propeller and test the engine using a water supply (flushing muffs) to verify correct water pump 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 kit fits my engine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis kit fits specific Yamaha 2-Stroke 40 HP and 50 HP models from 1995-2009. Please check the \u003cstrong\u003eCompatible Engine Models\u003c\/strong\u003e table on this page and verify your engine's model and year range. Cross-referencing your existing part number with our list also ensures a correct match.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace the water pump impeller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor preventative maintenance, it is recommended to replace your water pump impeller every \u003cstrong\u003e1-2 years or every 100-200 hours of use\u003c\/strong\u003e, depending on operating conditions. Frequent use in saltwater or sandy\/silty water may require more frequent inspections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs of a failing water pump?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCommon signs include the engine overheating at idle or low speeds, a weak or intermittent water stream from the \"telltale\" outlet, and visible cracks or damage on the old impeller upon inspection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOEM 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\u003eHow 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\u003eWhat 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\n","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50485483733305,"sku":"SIE-17IY011","price":23.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Yamaha_40HP-50HP_2-Stroke_6H4-W0078-00-00_-_JLM_MARINE-8289214.jpg?v=1755252184"},{"product_id":"fuel-pump-assembly-for-mercury-mariner-15-55hp-2-stroke-models-43113t","title":"692-24410-00-00 Fuel Pump for Yamaha Mercury Tohatsu Suzuki | JLM Marine","description":"\u003ch2\u003eOEM Part Numbers\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e356-04000-0, 356-04000-1, 356040000, 356040001, 356040000M, 356040001M\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eCompatible Models\u003c\/h2\u003e\n\u003cp\u003eNissan\/Tohatsu\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\nTwo-Stroke Engines:\n\u003cul\u003e\n\u003cli\u003e25HP (All Years)\u003c\/li\u003e\n\u003cli\u003e30HP (All Years)\u003c\/li\u003e\n\u003cli\u003e40HP (All Years)\u003c\/li\u003e\n\u003cli\u003e50HP (All Years)\u003c\/li\u003e\n\u003cli\u003e60HP (All Years)\u003c\/li\u003e\n\u003cli\u003e70HP (All Years)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eExplosion Diagram\u003c\/h2\u003e\n\u003cp\u003e\u003cimg alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.18 kg (181g)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 10\"\" x 9\"\" x 6\"\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFuel Pump Assembly (1x)\u003c\/li\u003e\n\u003cli\u003eHose Clamp (90467-08004-00) – 9*1mm – \u003cstrong\u003eQuantity: 2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGasket (650-24431-A0-00) – \u003cstrong\u003eQuantity: 2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Instructions\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the engine is turned off and has cooled down completely.\u003c\/li\u003e\n\u003cli\u003eRelieve any pressure in the fuel system.\u003c\/li\u003e\n\u003cli\u003eDisconnect the battery to prevent accidental ignition.\u003c\/li\u003e\n\u003cli\u003eRemove the existing fuel pump assembly carefully.\u003c\/li\u003e\n\u003cli\u003eInstall the new Fuel Pump Assembly, ensuring all connections are secure and correctly aligned.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery and pressurize the fuel system.\u003c\/li\u003e\n\u003cli\u003eStart the engine and inspect for proper operation and any potential leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\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 as compatible, 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\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50640011067705,"sku":"17FP007","price":20.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/JLM17FP007-1_edcc84b2-0c93-4761-bbaf-5ce89a66e695.jpg?v=1755742124"}],"url":"https:\/\/jlmmarine.com\/collections\/yamaha-50etlk-parts.oembed","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}