Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Replaces 61N-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Replaces 61N-W0078-01-00)

This water pump impeller repair kit is designed for a range of Yamaha outboard motors, including 2-Stroke 25B, 25X, 30H, and 30G models (2000–2018). It also fits 4-Stroke F25A and F25D engines (1998–2017) and various FT8 and FT9.9 high thrust models from 2001 onwards.

This assembly is a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring comprehensive compatibility for routine maintenance or repair.

• Complete Kit: Includes a new impeller, housing, wear plate, gaskets, and all necessary bolts and seals for a full replacement.
• Durable Materials: Features a neoprene impeller for flexibility and longevity, housed in a durable Nylon PA66 plastic with a stainless steel cup and wear plate.
• Installation Location: Mounts on the lower unit (gearcase) of the outboard.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Yamaha 2-Stroke Engines

Yamaha 4-Stroke Engines

Technical Specifications

Package Contents

• 1 x Water Pump Housing (61N-44311-01-00)
• 1 x Cartridge Insert (61N-44322-00-00)
• 1 x Impeller (6H4-44352-02-00)
• 1 x Water Seal Damper (61N-44323-00-00)
• 1 x Cartridge Outer Plate (6L2-44367-00-00)
• 4 x Plain Washer (92990-06600-00)
• 1 x Woodruff Key (90280-03024-00)
• 1 x O-Ring (93210-45161-00)
• 4 x Bolt (97095-06040-00)

Installation Guide

1. Safety First: Shift the outboard motor to the neutral position and disconnect the battery.
2. Remove Lower Unit: Unbolt and carefully lower the gearcase from the engine's midsection. Keep track of all mounting bolts.
3. Access Water Pump: The water pump housing is located on top of the gearcase. Remove the bolts securing the housing.
4. Disassemble Pump: Lift the housing off the driveshaft. Note the orientation of the impeller vanes and remove the old impeller, wear plate, and any gaskets.
5. Clean Surfaces: Thoroughly clean the mounting surfaces of the gearcase and the interior of the housing, removing all old gasket material and debris.
6. Install New Components: Place the new gaskets and the cartridge outer plate from the kit. Install the new cartridge insert into the housing.
7. Install Impeller: Apply a light coat of marine grease to the housing interior and slide the new impeller onto the driveshaft. Turn the shaft clockwise to set the vanes in the correct direction.
8. Reassemble Housing: Place the housing over the impeller and align the bolt holes. Tighten the bolts to the manufacturer's recommended torque.
9. Reinstall Lower Unit: Carefully guide the lower unit back into position, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with mounting bolts.
10. Test Operation: Reconnect the battery. Using a water supply (flushing muffs), start the engine and check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my Yamaha engine?
This kit is designed for a wide range of Yamaha models, including 2-Stroke 25B/30H series and 4-Stroke F25A/F25D engines. To be certain, please check your specific model and year against the "Compatible Engine Models" table on this page. Cross-referencing your old part number with our "Part Number Cross-Reference" table is also the best way to ensure a match.

What are the signs that my water pump impeller needs replacing?
Common signs of a failing impeller include a weak or inconsistent water stream from the "telltale" outlet, engine overheating alerts, or visible damage like cracked, stiff, or missing vanes on the old impeller upon inspection.

How often should the water pump impeller be replaced?
For optimal engine protection, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater use).

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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 & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify 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.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.