GHmarine Water Pump Impeller Repair Kit for Yamaha 25–30 HP — 61N-W0078 Replacement with Impeller, Pump Cup & Seals

GHmarine 61N-W0078 is a complete water pump impeller repair kit engineered to restore cooling performance on Yamaha 25–30 HP outboard engines.

If your Yamaha 2-stroke C30 or 4-stroke F25 outboard is running hot, cavitating, or showing diminished cooling flow, this repair kit provides the core components needed to rebuild the lower unit cooling pump. The kit replaces Yamaha part numbers 61N-W0078-10/11/13/14 and fits a range of 1993–1995 2-stroke models and select 4-stroke F-25 engines. GHmarine supplies the impeller, pump cup, housing, wear plate, mounting hardware, woodruff key, O-ring and water seal so you can complete a thorough repair in one service visit.

How will this kit fix overheating or reduced water flow?

Replacing worn parts inside the water pump restores the seal and rotor action that draws cooling water through the engine. New components reduce leakage and re-establish consistent water circulation to the thermostat and lower unit. Proper installation eliminates common causes of intermittent overheating and extends engine life.

• Fresh rubber impeller restores vane flexibility and suction.
• New pump cup and housing remove warped or corroded sealing surfaces.
• Wear plate provides a clean mating surface for efficient pumping.
• Seals and O-ring stop bypass and prevent air ingestion.

Which Yamaha models and part numbers does this kit cover?

The kit is compatible with several Yamaha 2-stroke 30HP C30 variants from the mid-1990s and certain Yamaha 4-stroke F-25 engines. It is supplied as a direct replacement for Yamaha 61N-W0078 series part numbers, making cross-referencing and ordering straightforward. Check your engine serial and model year to confirm fit before purchase.

• Fits Yamaha 2-stroke 30HP: C30ELRR (1993), C30ELRS (1994), C30MLHS (1994), C30ELRT (1995).
• Works with Yamaha 4-stroke F-25 series where specified.
• Direct replace for 61N-W0078-10-00, -11-00, -13-00, -14-00.
• Verify OEM part number and model year for precise compatibility.

What parts are included and what tools will I need to install them?

This GHmarine repair kit bundles all primary pump components so you avoid multiple orders. Typical installation requires basic marine mechanic tools and moderate mechanical skill; if you’re unfamiliar with lower-unit service, consider a professional technician. Installation restores the pump without needing additional engine-specific parts in most cases.

• Included: impeller, pump cup, water pump housing, wear plate.
• Also included: bolts with washers, woodruff key, O-ring, and water seal.
• Suggested tools: socket set, screwdrivers, torque wrench, puller for propeller.
• Allow time for flange inspection and gasket surface cleaning before assembly.

How durable is the kit and what maintenance helps longevity?

Components are designed for marine environments and resist corrosion when installed correctly. Regular off-season checks and replacing the impeller every few years or at first signs of wear will maintain performance. Avoid running with a clogged intake or in shallow, debris-filled water to minimize premature damage.

• Replace impeller at manufacturer-recommended intervals or if damaged.
• Inspect housing and wear plate for scoring before assembly.
• Keep intake screens clean and clear of weeds and debris.
• Use marine-grade lubricants on seals during installation.

Who is this for: Boat owners, marine technicians and DIY mechanics with Yamaha outboards who need a reliable, all-in-one water pump rebuild solution for 25–30 HP engines. If you operate a 1993–1995 C30 series or compatible F-25 Yamaha motor and are troubleshooting cooling issues or performing scheduled lower-unit maintenance, this GHmarine kit provides the parts required to complete the repair quickly and accurately.