UANOFCN Outboard Water Pump Impeller Kit Model 61A-W0078, 150-300 HP with Housing, Full Rebuild Kit

A complete UANOFCN water pump impeller kit designed to restore cooling for Yamaha 150–300 HP outboards by replacing worn internal pump parts.

Keep your Yamaha outboard running cool and avoid overheating with this full-service replacement kit. The UANOFCN 61A-W0078 kit includes the impeller, housing, wear plate and all required seals and fasteners to rebuild the pump section of many Yamaha mid-to-high horsepower engines. It’s engineered to match the fit and function of several OEM part numbers so you can service seasonal maintenance or perform an emergency field repair with confidence.

Which Yamaha engines will this impeller kit fit?

This kit fits a wide range of Yamaha four-stroke outboards from 150 HP up to 300 HP. It replaces multiple OEM numbers, making it suitable for several model years and service configurations. Always cross-check your engine part number before ordering to ensure compatibility.

• Compatible with Yamaha 150, 175, 200, 225, 250 and 300 HP models
• Replaces part numbers such as 61A-W0078 and related variants
• Also matches aftermarket cross-references like Sierra 18-3396-1

How easy is it to install the UANOFCN impeller kit?

The kit supplies every component needed to rebuild the pump assembly, reducing the need to hunt for missing parts. If you have basic mechanical skills and common tools, removal and replacement can be done on the workbench or in a boat haul-out. Follow the service manual torque and alignment specifications for reliable results.

• Includes impeller, housing, wear plate, insert cup and gasket for a full rebuild
• Comes with bolts, pins, O-rings and key to avoid extra purchases
• Fits into the factory mounting points for a direct replacement

What materials and parts are included for durability?

The kit combines a resilient rubber impeller with a precision-molded housing and wear plate to maintain consistent water flow and minimize cavitation. Critical seals and fasteners are included so the assembly restores a water-tight system. These parts are intended as a direct-service replacement rather than an upgrade to the cooling system.

• Rubber impeller engineered for flexible blade action and wear resistance
• Machined housing and insert cup for correct clearances and alignment
• Gasket, O-rings, pins and hardware to ensure proper sealing and retention

When should you replace your outboard pump impeller?

Inspect the impeller every season and plan replacement every two to three seasons under normal use, or sooner if you notice reduced cooling flow. Regular replacement prevents overheating and potential engine damage caused by insufficient water circulation. Keep a spare kit onboard if you run long passages or in remote areas.

• Seasonal inspection recommended; replace every 2–3 seasons under typical conditions
• Replace sooner after long idle periods or if blades show cracking or deformation
• Carry a spare kit for emergency field repairs during long trips

Who is this for: The UANOFCN 61A-W0078 Outboard Water Pump Impeller Kit is aimed at boating owners, marine mechanics and DIY enthusiasts who maintain Yamaha 150–300 HP outboards. It’s appropriate for routine seasonal service, pre-season tune-ups, and emergency field replacements where a complete set of pump components is required. Verify your engine’s part number and service manual before installation to confirm fitment.