{"product_id":"impeller-fits-yamaha-2-hp-2-stroke-replaces-646-44352-01-00","title":"Impeller – Fits Yamaha 2 HP 2-Stroke (Replaces 646-44352-01-00)","description":"\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\u003csection\u003e\n    \u003ch2\u003eProduct Details\u003c\/h2\u003e\n    \u003cp\u003eThis is a direct replacement \u003cstrong\u003eImpeller for Yamaha 2 HP 2-Stroke Outboard Motors\u003c\/strong\u003e from model years 1987–2002. It is engineered to meet or exceed original equipment specifications, ensuring reliable performance for your engine's cooling system.\u003c\/p\u003e\n    \u003cp\u003eThis part replaces Yamaha OEM part 646-44352-01-00 and is a direct interchange for Sierra 18-3074, Mallory 9-45605, and NGK 89880.\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003eInstallation is a direct fit to the OEM housing and drive shaft.\u003c\/li\u003e\n        \u003cli\u003eConstructed from durable neoprene rubber with a brass insert for longevity.\u003c\/li\u003e\n        \u003cli\u003eFeatures a 6-blade flexible design for efficient water circulation.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n    \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\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          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eSierra\u003c\/td\u003e\n            \u003ctd\u003e18-3074\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eMallory\u003c\/td\u003e\n            \u003ctd\u003e9-45605\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eNGK\u003c\/td\u003e\n            \u003ctd\u003e89880\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n              \u003ctd\u003eAqua Power\u003c\/td\u003e\n              \u003ctd\u003e2171\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n    \u003cp\u003eConfirm your engine model and year in the table below.\u003c\/p\u003e\n    \u003cp\u003e\u003cb\u003eFor Yamaha Outboards:\u003c\/b\u003e This impeller fits specific 2 HP 2-stroke models. Please match your model code and year to ensure correct fitment.\u003c\/p\u003e\n    \u003cdiv class=\"ss-table-wrap\"\u003e\n      \u003ctable class=\"ss-table\" aria-label=\"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            \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\u003e2MSHA\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHZ, 2MSHKZ\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHY\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHX\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHW\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHV\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHU\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHT\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1995\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHS\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHR\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHQ\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2MSHP\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e2SH\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1990\u003c\/td\u003e\n\u003ctd\u003e646-44352-01-00\u003c\/td\u003e\n\u003ctd\u003eWater pump impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\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\u003c\/dd\u003e\n        \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n        \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eKey-slotted drive shaft\u003c\/dd\u003e\n        \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene rubber with brass insert\u003c\/dd\u003e\n        \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n        \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eDirect fit to drive shaft\u003c\/dd\u003e\n        \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003e6 flexible blade design\u003c\/dd\u003e\n    \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e1 x Impeller (replaces 646-44352-01-00)\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n    \u003col\u003e\n        \u003cli\u003eDisconnect the battery and ensure the outboard is in neutral.\u003c\/li\u003e\n        \u003cli\u003eRemove the bolts securing the lower unit (gearcase) and carefully separate it from the upper housing.\u003c\/li\u003e\n        \u003cli\u003eLocate and unbolt the water pump cover to expose the impeller.\u003c\/li\u003e\n        \u003cli\u003eNote the rotational direction of the old impeller's blades before removing it. Remove the woodruff key from the shaft.\u003c\/li\u003e\n        \u003cli\u003eClean any debris or corrosion from the pump housing, wear plate, and shaft. Inspect for deep grooves or damage.\u003c\/li\u003e\n        \u003cli\u003ePlace the new woodruff key in its slot on the driveshaft.\u003c\/li\u003e\n        \u003cli\u003eSlide the new impeller onto the shaft. Turn the driveshaft clockwise while pushing down to help fold the blades into the correct orientation.\u003c\/li\u003e\n        \u003cli\u003eApply a thin layer of marine grease or soap-and-water solution to the inside of the pump housing.\u003c\/li\u003e\n        \u003cli\u003eReinstall the housing and tighten the bolts to the manufacturer's recommended torque.\u003c\/li\u003e\n        \u003cli\u003eReattach the lower unit, ensuring the driveshaft and water tube align correctly.\u003c\/li\u003e\n        \u003cli\u003eOnce assembled, test the engine using a water supply (\"muffs\") to confirm water is pumping from the tell-tale outlet.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow do I find my engine model to check for fitment?\u003c\/summary\u003e\n        \u003cp\u003eYour Yamaha outboard's model and serial number are typically located on a tag on the transom clamp bracket. This impeller fits Yamaha 2 HP 2-stroke models listed in the compatibility table, replacing OEM part 646-44352-01-00.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWhat are the signs of a faulty impeller?\u003c\/summary\u003e\n        \u003cp\u003eKey indicators include a weak or nonexistent water stream from the \"telltale\" outlet, engine overheating alarms, or visible cracks and stiffness in the impeller's rubber blades upon inspection.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow often should this impeller be replaced?\u003c\/summary\u003e\n        \u003cp\u003eAs a preventative measure, we recommend replacing the impeller every 1-2 years or after every 100-200 hours of operation. Frequency should increase if you primarily operate in saltwater or sandy\/silty conditions.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eCan I run the engine dry after installing the new impeller?\u003c\/summary\u003e\n        \u003cp\u003eNo. Never run the engine without a water supply, even for a few seconds. Dry running will destroy the new neoprene impeller almost instantly. Always use a flush bag (\"muffs\") or run the engine in the water after installation.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWhat causes premature impeller failure?\u003c\/summary\u003e\n        \u003cp\u003eThe most common causes are running the pump dry, sucking up abrasive sand or debris, and natural degradation of the rubber over time. Infrequent use can also cause the blades to stiffen and take a permanent set.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eIs this part any different from the original Yamaha part?\u003c\/summary\u003e\n        \u003cp\u003eThis aftermarket part is designed as a direct replacement for the OEM impeller. It is made with comparable high-quality neoprene and brass materials to meet or exceed original performance and durability standards.\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). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\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 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\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n    \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\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\u003c\/section\u003e\n\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 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":50723790225723,"sku":"UK17IY009","price":16.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_2_HP_646-44352-01_-_JLM_MARINE-8288906.jpg?v=1763031851","url":"https:\/\/seasierra.com\/products\/impeller-fits-yamaha-2-hp-2-stroke-replaces-646-44352-01-00","provider":"SeaSierra","version":"1.0","type":"link"}