{"product_id":"water-pump-impeller-kit-fits-yamaha-2-stroke-25-30-hp-replaces-689-w0078-a4-00-689-w0078-04-00","title":"Water Pump Impeller Kit – Fits Yamaha 2-Stroke 25–30 HP (Replaces 689-W0078-A4-00, 689-W0078-04-00)","description":"\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 *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.ss-table th, table.ss-table td {\npadding: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 *\/\ntable.ss-table th {\nwhite-space:nowrap; \/* Do not wrap *\/\nword-break:normal; \/* Don’t break words *\/\nletter-spacing:normal; \/* Prevent theme styles from stretching letters *\/\nfont-weight:600;\nbackground:#f8fafc;\n}\n\n\/* Small screen optimization *\/\n@media (max-width:480px){\ntable.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n}\n\u003c\/style\u003e\n\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha 2-Stroke 25–30 HP Outboard Engines\u003c\/strong\u003e is a comprehensive, direct-fit solution for maintaining the cooling system on several Yamaha 2-stroke outboard models. It is designed for specific 25 HP (1986–1997) and 30 HP (1986–1992) series engines, including C25, C30, CV25, and CV30 variants, ensuring reliable performance.\u003c\/p\u003e\n\u003cp\u003eThe kit serves as a direct interchange for Yamaha part numbers 689-W0078-A4-00, 689-W0078-06-00, 689-W0078-05-00, and 689-W0078-A6-00, as well as aftermarket equivalents like Sierra Marine 18-3426, 18-3427, and Mercury 47-42431M \/ 47-84829M.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for direct replacement of the original water pump assembly.\u003c\/li\u003e\n\u003cli\u003eConstructed from marine-grade metal and durable CR Neoprene rubber for longevity in saltwater and freshwater environments.\u003c\/li\u003e\n\u003cli\u003eIncludes all essential components for a complete overhaul, including the impeller, housing, plates, and gaskets.\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 Matrix\"\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\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003ctd\u003eOEM Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e689-W0078-04-00\u003c\/td\u003e\n\u003ctd\u003eOEM Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e689-W0078-05-00\u003c\/td\u003e\n\u003ctd\u003eOEM Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e689-W0078-06-00\u003c\/td\u003e\n\u003ctd\u003eOEM Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003ctd\u003eOEM Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-3426\u003c\/td\u003e\n\u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-3427\u003c\/td\u003e\n\u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-42431M\u003c\/td\u003e\n\u003ctd\u003eAftermarket Interchange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-84829M\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\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. Please check your specific model and year range before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Yamaha Engine \u0026amp; Model Compatibility\"\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\u003e25\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1987\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\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\u003e1991–1992\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV25\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eCV30\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–1990\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A4-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ELRU\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ELRV\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ELHU\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25ELHV\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25MLHU\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25MSHU\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25MLHV\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC25MSHV\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003e689-W0078-A6-00\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\u003eDirect replacement\u003c\/dd\u003e\n\u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMarine-grade metal (housing), CR Neoprene Rubber (impeller)\u003c\/dd\u003e\n\u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/Gray\u003c\/dd\u003e\n\u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e236–285 g (8.4–10.1 oz)\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 Water Pump Impeller (689-44352-02-00)\u003c\/li\u003e\n\u003cli\u003e1 x Woodruff Key (664-44338-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Housing (689-44311-03-00)\u003c\/li\u003e\n\u003cli\u003e1 x Insert Cartridge (689-W4432-01-00\/689-W4432-02-00)\u003c\/li\u003e\n\u003cli\u003e1 x Wear Plate\/Cartridge Outer Plate (689-44323-02-00\/689-44323-03-00)\u003c\/li\u003e\n\u003cli\u003e1 x Cartridge Gasket (689-44324-A0-00)\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Gasket (689-44316-A0-00)\u003c\/li\u003e\n\u003cli\u003e1 x Water Seal Damper (626-44365-01-00\/626-44365-02-00)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x\u003c\/span\u003e Bolt with Washer (97080-06030-00\/90119-06M07-00)\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 to neutral.\u003c\/li\u003e\n\u003cli\u003eDrain the gearcase lubricant and cooling system.\u003c\/li\u003e\n\u003cli\u003eRemove the lower unit (gearcase) from the outboard's driveshaft housing.\u003c\/li\u003e\n\u003cli\u003eUnbolt and remove the old water pump housing to access the impeller.\u003c\/li\u003e\n\u003cli\u003eCarefully note the orientation of the old components before removing them.\u003c\/li\u003e\n\u003cli\u003eClean the mounting surfaces and inspect the driveshaft for any wear or damage.\u003c\/li\u003e\n\u003cli\u003eInstall the new Woodruff key, impeller, wear plate, and gaskets as provided in the kit. Ensure the impeller vanes are oriented correctly (typically turning clockwise during installation).\u003c\/li\u003e\n\u003cli\u003eSecurely fasten the new water pump housing and insert cartridge.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, refill the gearcase with the correct oil, and reconnect all components.\u003c\/li\u003e\n\u003cli\u003eOnce assembled, start the engine at idle and confirm a steady stream of water from the cooling system's tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if this kit fits my Yamaha engine?\u003c\/summary\u003e\n\u003cp\u003eThis kit is specifically designed for Yamaha 2-stroke 25 HP (1986–1997) and 30 HP (1986–1992) models, including the C25, C30, CV25, and CV30 series. Always verify your engine's model and year against our compatibility table before purchase.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n\u003cp\u003eCommon symptoms include the engine overheating, a weak or nonexistent water stream from the tell-tale outlet, or visible damage such as cracks, stiffness, or missing vanes on the old impeller upon inspection.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow often should I replace my water pump impeller?\u003c\/summary\u003e\n\u003cp\u003eFor preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or after 100-200 hours of operation. Replacement intervals should be shorter in saltwater or silty\/sandy conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the pump housing included in this kit?\u003c\/summary\u003e\n\u003cp\u003eYes, this is a complete repair kit that includes the water pump housing, insert cartridge, wear plate, impeller, and all necessary gaskets, seals, and bolts for a full replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy do some parts list multiple part numbers?\u003c\/summary\u003e\n\u003cp\u003eThis indicates that the component in the kit is a direct replacement for several OEM part numbers, which may include original parts and their subsequent supersessions. The part is designed to fit all listed variations.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n\u003cp\u003eThis listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency and quality control.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\n\u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images and specifications against 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":50723793436987,"sku":"YY-20KY006","price":28.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/YY-20KY006.png?v=1763031923","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-2-stroke-25-30-hp-replaces-689-w0078-a4-00-689-w0078-04-00","provider":"SeaSierra","version":"1.0","type":"link"}