{"product_id":"water-pump-impeller-kit-fits-yamaha-f8-f9-9-f20-f25-ft8-ft9-9-replaces-61n-w0078-11-00","title":"Water Pump Impeller Kit – Fits Yamaha F8, F9.9, F20, F25, FT8, FT9.9 (Replaces 61N-W0078-11-00)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis comprehensive \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha F8, F9.9, F20, F25, FT8, FT9.9 Outboards (Replaces 61N-W0078-11-00)\u003c\/strong\u003e provides all necessary components to restore your engine's cooling system. It is designed for a range of Yamaha 4-stroke models from 1998 to 2017+ (including F20A\/D, F25A\/D, FT8D\/G, and FT9.9G\/J) and select 2-stroke models like the 30G and C30.\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct replacement for Yamaha OEM part numbers 61N-W0078-10-00, 61N-W0078-11-00, 61N-W0078-13-00, and 61N-W0078-14-00, as well as Sierra part 18-3432, ensuring broad compatibility and reliable performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Mounts in the lower unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Components:\u003c\/strong\u003e Includes the pump housing, a complete impeller assembly, and all required hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Health:\u003c\/strong\u003e Restores proper cooling pressure to prevent overheating and potential engine damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\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\u003e61N-W0078-10-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11-00\u003c\/td\u003e\n        \u003ctd\u003ePrimary replacement number\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-13-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-14-00\u003c\/td\u003e\n        \u003ctd\u003eLatest supersession\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3432\u003c\/td\u003e\n        \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis kit is verified to fit the following Yamaha outboard models.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Yamaha Engine Models\"\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\u003eF20AE\u003c\/td\u003e\n        \u003ctd\u003e20\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2003–2006\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF20DET\u003c\/td\u003e\n        \u003ctd\u003e20\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2011–2015\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF25A, AE, AM, AW, EL, MH\u003c\/td\u003e\n        \u003ctd\u003e25\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998–2009\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF25DE, DM, MH\u003c\/td\u003e\n        \u003ctd\u003e25\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2009–2015\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e6BT1-6BT8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eFT8D\/FT8G\u003c\/td\u003e\n        \u003ctd\u003e8\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2014\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eFT9.9G\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2008–2012\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eFT9.9J\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2013+\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e30G\u003c\/td\u003e\n        \u003ctd\u003e30\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–2000\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eC30\u003c\/td\u003e\n        \u003ctd\u003e30\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1997\u003c\/td\u003e\n        \u003ctd\u003e61N-W0078-11\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 Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eLower Unit\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eAluminum\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eManufacturer's Standard\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eIncludes pump housing and complete impeller assembly\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Pump Body (61N-44311-00-00\/61N-44311-01-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller (6H4-44352-00\/6H4-44352-01\/6H4-44352-02)\u003c\/li\u003e\n  \u003cli\u003e1 x Cartridge Insert (63V-44322-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Seal Damper (6L2-44367-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Woodruff Key (664-44338-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x O-Ring (93210-49046-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Cartridge Outer Plate (68T-44323-00-00)\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Dowel Pins (93604-10M03-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Bolts (97095-08045-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Plates (63V-44328-01-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and shift the outboard into neutral.\u003c\/li\u003e\n  \u003cli\u003ePlace a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the upper casing and carefully lower it.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the old water pump housing to access the impeller. Note the orientation of the old parts.\u003c\/li\u003e\n  \u003cli\u003eClean the mounting surfaces and remove the old impeller, key, and gaskets.\u003c\/li\u003e\n  \u003cli\u003eInstall the new woodruff key, impeller (turn clockwise when seating), and gaskets\/seals from the kit.\u003c\/li\u003e\n  \u003cli\u003eInstall the new pump housing, insert, and outer plate, ensuring seals are correctly seated.\u003c\/li\u003e\n  \u003cli\u003eTighten the housing bolts to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are aligned.\u003c\/li\u003e\n  \u003cli\u003eRefill the gearcase with fresh oil, reinstall the battery, and start the engine on a water supply to verify a strong tell-tale stream.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm this kit fits my Yamaha outboard?\u003c\/summary\u003e\u003cp\u003eCheck your engine’s model number and year against the \"Engine \u0026amp; Model Compatibility\" table. The model number is usually on a sticker on the transom clamp bracket. This kit fits a specific range of F-series 4-strokes and older 2-strokes, so confirming your exact model is crucial.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a weak or non-existent \"tell-tale\" water stream, an engine overheat alarm, or steam from the exhaust. Reduced top-end speed can also be a sign of the engine limiting RPM due to high temperatures.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\u003cp\u003eAs a preventative maintenance item, it's recommended to replace the impeller every 1-2 years or every 100-200 hours of use, whichever comes first. Usage in saltwater or sandy\/silty conditions may require more frequent changes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eMy engine is overheating, but the tell-tale is streaming. Could it still be the impeller?\u003c\/summary\u003e\u003cp\u003eYes. A strong tell-tale stream indicates some water flow but doesn't guarantee sufficient pressure and volume to cool the entire engine block, especially at higher RPMs. A worn impeller can lose efficiency under load, leading to overheating even with a visible water stream at idle.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs it necessary to replace the entire kit, or can I just change the impeller?\u003c\/summary\u003e\u003cp\u003eWhile just replacing the impeller is possible, it is highly recommended to replace the full kit. The included housing, wear plates, and seals wear down over time, and a new impeller in a worn housing will perform poorly and have a much shorter lifespan.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between this aftermarket kit and an OEM one?\u003c\/summary\u003e\u003cp\u003eThis is an aftermarket replacement part, not an OEM (Original Equipment Manufacturer) component. It is engineered to meet or exceed OEM specifications using comparable materials and construction methods. Our parts are produced in an ISO 9002 certified facility and undergo batch inspections to ensure quality and fitment, offering a reliable alternative at a better value.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow fast do you ship and what are the costs?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide, with most orders arriving in 5–15 days. Standard shipping is free for most destinations. Expedited shipping options, if available for your location, will be presented at checkout with their respective costs.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should you encounter a problem, please contact our support team with your order number. We accept returns on unused items in their original packaging within our standard return period. Please see our full policy page or contact us for detailed instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723965534523,"sku":"23KY708","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_FT8_-_FT99_-_FT99_61N-W0078-11-00_-_JLM_MARINE-8289330.jpg?v=1763038592","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-f8-f9-9-f20-f25-ft8-ft9-9-replaces-61n-w0078-11-00","provider":"SeaSierra","version":"1.0","type":"link"}