{"product_id":"water-pump-impeller-kit-fits-yamaha-4hp-5hp-2-stroke-f4-f5-f6-4-stroke-replaces-6e0-w0078-a2-00","title":"Water Pump Impeller Kit – Fits Yamaha 4HP\/5HP 2-Stroke, F4\/F5\/F6 4-Stroke (Replaces 6E0-W0078-A2-00)","description":"\u003ch2\u003eWater Pump Impeller Kit – Fits Yamaha 4HP\/5HP 2-Stroke, F4\/F5\/F6 4-Stroke (Replaces 6E0-W0078-A2-00)\u003c\/h2\u003e\n\u003cp\u003eThis water pump impeller service kit is designed for \u003cstrong\u003eYamaha 2-Stroke 4HP and 5HP\u003c\/strong\u003e outboards (1988–2019) and \u003cstrong\u003e4-Stroke F4, F5, and F6\u003c\/strong\u003e 1-cylinder models (1998–2011). It provides all the necessary components to service and restore your engine's cooling system.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for Yamaha OEM part numbers \u003cstrong\u003e6E0-W0078-A2-00, 6E0-W0078-00-00, 6E0-W0078-01-00, 6E0-W0078-02-00, and 6E0-W0078-A3-00\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Direct replacement for the original water pump components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Components:\u003c\/strong\u003e Includes the impeller, housing insert cup, plate, gasket, and key.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Materials:\u003c\/strong\u003e Features a robust rubber impeller and corrosion-resistant housing components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\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\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-01-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A3-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3410\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAM\u003c\/td\u003e\n\u003ctd\u003eAM6E0-W0078-A2\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\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\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\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\u003e4A, 4AC, 4ACMH, 4CMH\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–2019\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e5C, 5CM, 5CMH\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–2015\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998–2011\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003ctd\u003e1-cylinder models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF5\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998–2011\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003ctd\u003e1-cylinder models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF6\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998–2011\u003c\/td\u003e\n\u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n\u003ctd\u003e1-cylinder models\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\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eWater Pump Impeller Repair Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eDirect replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eRubber (impeller), Aluminum\/Alloy (components)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Color\u003c\/td\u003e\n\u003ctd\u003eBlack (impeller), Silver (metal parts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitting Type\u003c\/td\u003e\n\u003ctd\u003eDirect fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Technical Attributes\u003c\/td\u003e\n\u003ctd\u003eComplete service kit for water pump impeller replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x \u003cspan style=\"color:red;\"\u003eImpeller (6E0-44352-00)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Housing Insert Cup\u003c\/li\u003e\n\u003cli\u003e1 x Impeller Plate\u003c\/li\u003e\n\u003cli\u003e1 x Gasket\u003c\/li\u003e\n\u003cli\u003e1 x Impeller Key\u003c\/li\u003e\n\u003cli\u003eMultiple x Mounting Hardware (bolts\/screws)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Disconnect the spark plug leads and the battery cables to prevent accidental starting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess the Lower Unit:\u003c\/strong\u003e Shift the outboard into neutral and remove the bolts securing the lower unit (gearcase) to the engine's upper section.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove the Lower Unit:\u003c\/strong\u003e Carefully lower the gearcase away from the upper housing. The driveshaft will slide out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisassemble the Water Pump:\u003c\/strong\u003e Unscrew the bolts holding the water pump housing cover. Lift the cover off to expose the impeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove Old Components:\u003c\/strong\u003e Take note of the impeller's rotational direction. Remove the old impeller, impeller key, gaskets, and wear plate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean and Inspect:\u003c\/strong\u003e Thoroughly clean all surfaces, removing any old gasket material or debris. Inspect the housing for cracks or warping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall New Parts:\u003c\/strong\u003e Place the new gasket and impeller plate onto the gearcase. Install the impeller key into the driveshaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall New Impeller:\u003c\/strong\u003e Slide the new impeller down the driveshaft while turning the shaft clockwise to bed the vanes correctly inside the housing cup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReassemble the Pump:\u003c\/strong\u003e Place the housing cup over the impeller and reinstall the housing cover, tightening the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReattach Lower Unit:\u003c\/strong\u003e Guide the driveshaft back into the engine and reinstall the lower unit. Tighten all mounting bolts securely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Operation:\u003c\/strong\u003e Reconnect the spark plugs and battery. Start the engine in a test tank or with a water source attached to ensure a strong water stream from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my Yamaha engine?\u003c\/strong\u003e\u003cbr\u003e\nA: First, check the \"Compatible Engine Models\" table to ensure your engine's model and year range are listed. This kit is specifically for Yamaha 2-Stroke 4HP\/5HP (1988–2019) and 4-Stroke F4\/F5\/F6 (1998–2011) 1-cylinder models. Second, verify your current part number matches one of the numbers in the cross-reference list, such as \u003cstrong\u003e6E0-W0078-A2-00\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs my water pump impeller is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: The most common signs are the engine overheating, an alarm sounding (if equipped), or a weak or non-existent water stream from the \"tell-tale\" cooling system outlet. Upon inspection, a failing impeller may be cracked, brittle, or have broken vanes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: For preventative maintenance, it is best practice to inspect the impeller annually and replace it every \u003cstrong\u003e1-2 years or every 100-200 hours\u003c\/strong\u003e of operation. Replacement frequency depends on usage and water conditions (e.g., saltwater and sandy\/silty water cause more wear).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\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\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\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\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\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":50485658943801,"sku":"23KY701","price":52.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Yamaha__4_-_5_HP_2-stroke_F4_-_F5_-_F6_1_cyl_4-stroke_6E0-W0078-00_-_JLM_MARINE-8289259.jpg?v=1755252165","url":"https:\/\/jlmmarine.com\/products\/water-pump-impeller-kit-fits-yamaha-4hp-5hp-2-stroke-f4-f5-f6-4-stroke-replaces-6e0-w0078-a2-00","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}