{"product_id":"663-w006a-00-maintenance-kit-for-yamaha-55hp-bet-jlm-marine","title":"663-W006A-00 Maintenance Kit for Yamaha 55HP BET | JLM Marine","description":"\u003ch2\u003eMaintenance Kit for Yamaha 55HP BET – Complete Service Package (663-W006A-00)\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive maintenance kit is designed for \u003cstrong\u003eYamaha 55HP 2-Stroke BET models (1995-1997)\u003c\/strong\u003e, providing all essential components for routine servicing in one convenient package. Whether you're performing seasonal maintenance or a complete tune-up, this kit ensures your engine runs smoothly and reliably.\u003c\/p\u003e\n\n\u003cp\u003eDirectly replaces OEM part number \u003cstrong\u003e663-W006A-00\u003c\/strong\u003e, offering a complete solution that includes gaskets, impeller, thermostat, fuel filter, fasteners, and gear oil pump—eliminating the need to source individual components separately.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes \u003cstrong\u003e15 components\u003c\/strong\u003e covering water pump, fuel system, and cooling system maintenance\u003c\/li\u003e\n\u003cli\u003eFeatures genuine-specification impeller, thermostat, and fuel filter for optimal performance\u003c\/li\u003e\n\u003cli\u003eAll necessary gaskets, fasteners, and hardware included for complete installation\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\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\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-W006A-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\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\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\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\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eBET\u003c\/td\u003e\n\u003ctd\u003e55HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1995-1997\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\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\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\u003e663-W006A-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eYamaha 55HP 2-Stroke BET Models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Years\u003c\/td\u003e\n\u003ctd\u003e1995-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Type\u003c\/td\u003e\n\u003ctd\u003eComplete Maintenance Kit\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 maintenance kit includes the following \u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e15 components\u003c\/strong\u003e\u003c\/span\u003e for complete engine servicing:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-44315-A0\u003c\/strong\u003e – Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-44322-00\u003c\/strong\u003e – Cup, Insert × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-44323-00\u003c\/strong\u003e – Plate, Wear × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-44324-A0\u003c\/strong\u003e – Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-44366-00\u003c\/strong\u003e – Grommet × 1\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e6H3-44352-00\u003c\/strong\u003e – Impeller × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90280-03M03\u003c\/strong\u003e – Key × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e97095-08055\u003c\/strong\u003e – Bolt × 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e97095-08045\u003c\/strong\u003e – Bolt × 2\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e61N-24560-00\u003c\/strong\u003e – Fuel Filter × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e6F5-12411-30\u003c\/strong\u003e – Thermostat × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e663-12414\u003c\/strong\u003e – Thermostat Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90430-08020\u003c\/strong\u003e – Drain Gasket × 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e91490-30025\u003c\/strong\u003e – Cotter Pin × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24OP149\u003c\/strong\u003e – Gear Oil Pump × 1\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 remove the engine cowling to access internal components. Ensure the engine is cool and tilted properly for safe access.\u003c\/li\u003e\n\u003cli\u003eRemove the water pump housing by loosening the mounting bolts with the appropriate socket. Set aside the old impeller, wear plate, and gaskets.\u003c\/li\u003e\n\u003cli\u003eClean the water pump cavity thoroughly, removing any debris or old gasket material. Inspect for corrosion or damage that may require additional service.\u003c\/li\u003e\n\u003cli\u003eInstall the new wear plate (663-44323-00) and insert cup (663-44322-00) into the housing. Apply a thin layer of marine grease to ease impeller installation.\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller (6H3-44352-00) with glycerin or soapy water, then carefully insert it into the housing with blades oriented correctly. Install the key (90280-03M03) into the drive shaft slot.\u003c\/li\u003e\n\u003cli\u003ePosition the new gaskets (663-44315-A0 and 663-44324-A0) onto the pump housing, ensuring proper alignment. Apply a small amount of sealant if recommended by service manual.\u003c\/li\u003e\n\u003cli\u003eReinstall the water pump housing and secure with the provided bolts (97095-08055 and 97095-08045), tightening in a criss-cross pattern to manufacturer torque specifications.\u003c\/li\u003e\n\u003cli\u003eReplace the fuel filter (61N-24560-00) by disconnecting fuel lines and swapping the old filter with the new unit. Ensure hose clamps are secure to prevent leaks.\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat and install the new thermostat (6F5-12411-30) with its gasket (663-12414) into the cooling system housing. Verify proper seating before tightening the cover.\u003c\/li\u003e\n\u003cli\u003eReplace all drain gaskets (90430-08020) on oil drain plugs and install the cotter pin (91490-30025) as needed for lower unit assembly. Check that all fasteners are secure.\u003c\/li\u003e\n\u003cli\u003eUse the gear oil pump (24OP149) to refill the lower unit with fresh gear oil per manufacturer recommendations. Monitor for proper level and absence of leaks.\u003c\/li\u003e\n\u003cli\u003eReconnect all fuel lines, reinstall the cowling, and run the engine to verify water pump flow and proper operating temperature. Check all service points for leaks before returning to service.\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 maintenance kit fits my Yamaha engine?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit is designed specifically for Yamaha 55HP 2-Stroke BET models from 1995 to 1997. Verify your engine model designation (stamped on the mounting bracket or transom clamp) and cross-reference the OEM part number 663-W006A-00 with your service manual or parts diagram.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I perform maintenance using this kit?\u003c\/strong\u003e\u003cbr\u003e\nA: Yamaha recommends annual maintenance or every 100 hours of operation, whichever comes first. If you operate in sandy, silty, or saltwater conditions, consider servicing more frequently—every 50 hours or mid-season—to prevent premature wear.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my water pump impeller needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Look for weak water flow from the tell-tale (pilot hole), engine overheating, steam from the cowling, or alarm activation. A damaged impeller may also cause erratic temperature readings or reduced performance under load.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gaskets if they appear undamaged?\u003c\/strong\u003e\u003cbr\u003e\nA: No, always install new gaskets included in this kit to ensure proper sealing and prevent leaks. Reusing old gaskets—even if they look intact—can lead to cooling system failures or water intrusion into the powerhead.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include everything I need for a complete service?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit covers water pump, fuel filter, thermostat, and lower unit drain gaskets, plus a gear oil pump for fluid changes. You will need to supply fresh gear oil, engine oil (if applicable), and basic hand tools separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket maintenance kits?\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":52418549285177,"sku":"25KY489-2","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-25KY489-2_4206b1b4-14ee-437d-acff-f5a36164a01b.png?v=1776687048","url":"https:\/\/jlmmarine.com\/es\/products\/663-w006a-00-maintenance-kit-for-yamaha-55hp-bet-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}