{"product_id":"water-pump-impeller-kit-fits-yamaha-25-40-hp-4-stroke-replaces-66t-w0078-00-00","title":"Water Pump Impeller Kit – Fits Yamaha 25-40 HP 4-Stroke (Replaces 66T-W0078-00-00)","description":"\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis aftermarket \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha 25-40 HP 4-Stroke (Replaces 66T-W0078-00-00)\u003c\/strong\u003e provides a complete solution for servicing your outboard's cooling system. It is designed for a precise fit on Yamaha 4-stroke models including 25 HP (T25) from 2001–2016, 30 HP (F30) from 2001–2005, and 40 HP (F40) from 2000–2009, as well as select 40 HP 2-stroke models.\u003c\/p\u003e\n  \u003cp\u003eIt directly replaces Yamaha OEM part numbers 66T-W0078-00-00, 66T-W0078-01-00, and 66T-W0078-A0, along with Sierra equivalents 18-3413 \/ 18-3440 and Mallory 9-48610.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered for direct OEM replacement installation.\u003c\/li\u003e\n    \u003cli\u003eIncludes the pump housing for a comprehensive service.\u003c\/li\u003e\n    \u003cli\u003eFeatures a durable 6-blade neoprene impeller for reliable performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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  \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  \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\u003e66T-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003eOriginal Equipment Manufacturer\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e66T-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded Part\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e66T-W0078-A0\u003c\/td\u003e\n          \u003ctd\u003eSuperseded Part\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3413\u003c\/td\u003e\n          \u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3440\u003c\/td\u003e\n          \u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMallory\u003c\/td\u003e\n          \u003ctd\u003e9-48610\u003c\/td\u003e\n          \u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine Model Compatibility Chart\"\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\u003eT25\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eT25TLR\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eT25LA\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2009–2016\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF30A\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2005\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF30TLR\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2005\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40B\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2009\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40BEJR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2007\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40BMJH\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2007\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40BMLH\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2008\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40BTLR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2008\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40EJR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40EJRB\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40EJRC\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40EJRD\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2005\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40ESRA\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40ESRB\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40ESRY\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40ESRZ\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40MJH\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40MLH\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40MSH\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003eF40TLR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2006\u003c\/td\u003e\n\u003ctd\u003e66T-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\u003e40X\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eFrom 1998\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003ctd\u003eAlso fits select 2-stroke models\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40XWT\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eFrom 1998\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003ctd\u003eAlso fits select 2-stroke models\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eE40X\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eFrom 1998\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003ctd\u003eAlso fits select 2-stroke models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller Kit with Housing\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM Replacement\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene Rubber\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Design\u003c\/dt\u003e\n\u003cdd\u003e6-Blade\u003c\/dd\u003e\n    \u003cdt\u003eShaft Size\u003c\/dt\u003e\n\u003cdd\u003e16 mm\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Diameter\u003c\/dt\u003e\n\u003cdd\u003e52 mm\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Width\u003c\/dt\u003e\n\u003cdd\u003e19 mm\u003c\/dd\u003e\n    \u003cdt\u003eKeyway\u003c\/dt\u003e\n\u003cdd\u003eYes\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMarine Grade Metals\u003c\/dd\u003e\n    \u003cdt\u003eManufacturing Standards\u003c\/dt\u003e\n\u003cdd\u003eISO9002 Certified Factory (Aftermarket)\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (Aftermarket)\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x \u003cspan style=\"color:#d0021b;\"\u003eImpeller\u003c\/span\u003e (6H4-44352-02-00)\u003c\/li\u003e\n    \u003cli\u003e1 x \u003cspan style=\"color:#d0021b;\"\u003ePump Housing Cover\u003c\/span\u003e (63D-44312-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Insert (63D-44322-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Outer Plate (66T-44323-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket (63D-44316-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Seal Damper (663-44366-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-59MG7-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Woodruff Key (90280-03M03-00)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e4 x Bolts with Washer\u003c\/span\u003e (90119-08M15-00)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery and remove the engine cover. Locate and remove the bolts securing the lower unit (gearcase).\u003c\/li\u003e\n    \u003cli\u003eCarefully separate the lower unit from the upper casing. Be mindful of the shift shaft linkage, which may need to be disconnected.\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, driveshaft, and housing interior, removing any old gasket material or debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new key, gasket, wear plate, and impeller onto the driveshaft. Lubricate the new impeller and inside of the housing with a marine-safe grease.\u003c\/li\u003e\n    \u003cli\u003eInstall the new housing, insert, and seals, ensuring the impeller vanes are oriented correctly (curved in the direction of shaft rotation).\u003c\/li\u003e\n    \u003cli\u003eTorque all bolts to the manufacturer's specified values.\u003c\/li\u003e\n    \u003cli\u003eRe-assemble the lower unit to the engine, reconnect the shift shaft, and secure all mounting bolts.\u003c\/li\u003e\n    \u003cli\u003eOnce assembled, test the engine in water to confirm a strong and steady water stream from the tell-tale outlet.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\u003csummary\u003eHow do I know if this kit fits my engine?\u003c\/summary\u003e\u003cp\u003eThe surest way is to match your engine's model number and year against our compatibility chart. If your model is listed, the kit is a confirmed fit. Also, cross-reference your existing part number with those in our Part Number Matrix.\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 the engine overheating at idle or low speeds, a weak or non-existent water stream from the \"tell-tale\" outlet, or a brittle or cracked appearance on the old impeller upon inspection.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eHow often should I replace the impeller?\u003c\/summary\u003e\u003cp\u003eAs a preventative maintenance item, it is recommended to replace your water pump impeller every 100-200 operating hours or at least once a year, regardless of hours used. This is especially important if you operate in saltwater or sandy\/silty conditions.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eDoes this kit fit any 2-stroke models?\u003c\/summary\u003e\u003cp\u003eYes, while primarily for 4-stroke engines, this kit is also compatible with select Yamaha 40 HP 2-stroke models manufactured from 1998 onwards, including the 40X, 40XWT, and E40X series.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eIs it necessary to replace the entire pump kit, or just the impeller?\u003c\/summary\u003e\u003cp\u003eFor a reliable and long-lasting repair, it is highly recommended to replace the full kit, including the housing, wear plate, and gaskets. These components wear together over time, and a worn housing can cause a new impeller to fail prematurely.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eWhat's the difference between OEM and this aftermarket kit?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement, not an OEM part. It has been engineered to meet or exceed original equipment specifications for fit, form, and function, using comparable high-quality materials. It is manufactured in an ISO 9002 certified facility and batch-inspected for quality assurance.\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 quickly—typical transit time is 5–15 days for most regions. Standard shipping is free on all orders. Expedited shipping options, if available for your location, will be presented at checkout.\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. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window provided the item is unused and in its original packaging. Please see our full policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images and specifications against your original part before purchase. Even if your model is listed, variations can exist. Do not install if any differences are noted.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement component, not an Original Equipment Manufacturer (OEM) product.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation by a qualified marine mechanic is recommended to ensure safety and proper performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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 rigorously tested for real-world reliability.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with typical transit times of just 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with factories, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723801006395,"sku":"YY-17KY012","price":38.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/YY-17KY012.png?v=1763032171","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-25-40-hp-4-stroke-replaces-66t-w0078-00-00","provider":"SeaSierra","version":"1.0","type":"link"}