Water Pump Impeller Kit – Fits Yamaha F8, F9.9, F20, F25, FT8, FT9.9 Outboards (Replaces 61N-W0078-11-00)

Water Pump Impeller Kit – Fits Yamaha F8, F9.9, F20, F25, FT8, FT9.9 Outboards (Replaces 61N-W0078-11-00)

This water pump impeller repair kit provides a complete solution for servicing the lower unit cooling system on a wide range of Yamaha outboards. It is designed to fit specific 4-stroke models including the F20, F25, FT8, and FT9.9 series, as well as 2-stroke 30G and C30 models.

It serves as a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring comprehensive compatibility for routine maintenance or repair.

• Complete Kit: Includes the pump housing, impeller, wear plates, seals, and all necessary hardware for a full replacement.
• Durable Materials: Features a corrosion-resistant aluminum pump housing for longevity in marine environments.
• Installation Location: Designed for installation in the outboard's lower unit.

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 4-Stroke Models

Yamaha 2-Stroke Models

Technical Specifications

Package Contents

• 1 x Pump Body (61N-44311-00-00/61N-44311-01-00)
• 1 x Impeller (6H4-44352-00/6H4-44352-01/6H4-44352-02)
• 1 x Cartridge Insert (63V-44322-00-00)
• 1 x Water Seal Damper (6L2-44367-00-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-49046-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 2 x Dowel Pins (93604-10M03-00)
• 4 x Bolts (97095-08045-00)
• 2 x Plates (63V-44328-01-00)

Installation Guide

1. Disconnect the negative battery cable and remove the engine cover.
2. Shift the outboard into neutral. Remove the bolts securing the lower unit (gearcase) to the upper casing.
3. Carefully lower the gearcase, ensuring the driveshaft, shift shaft, and water tube disengage smoothly.
4. Place the lower unit on a workbench. Remove the four bolts securing the water pump housing.
5. Slide the old pump housing up and off the driveshaft. Remove the old impeller, key, and wear plates.
6. Thoroughly clean the driveshaft and the pump mounting surface.
7. Install the new Woodruff key, gaskets, and wear plates from the kit.
8. Slide the new impeller onto the driveshaft, turning it clockwise to align with the key and seat the vanes.
9. Lightly grease the inside of the new pump housing and slide it over the impeller.
10. Align the housing bolt holes, install the new bolts with seals, and tighten them to the manufacturer's specified torque.
11. Reinstall the lower unit, carefully aligning the driveshaft splines, water tube, and shift shaft.
12. Secure the lower unit with its mounting bolts and reconnect the battery. Test run the engine with a water supply.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?

A: First, check your engine's model, horsepower, and year against the comprehensive "Compatible Engine Models" tables provided above. For additional verification, you can use our Yamaha Serial Number Guide to pinpoint your exact engine model and the corresponding OEM part numbers.

Q: What are the signs my water pump impeller needs to be replaced?

A: Common indicators of a failing impeller include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable drop in cooling performance. A visual inspection during routine service may also reveal cracked, brittle, or worn impeller vanes.

Q: How often should I replace the water pump impeller?

A: As a general rule for preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or after every 100-200 hours of operation. Service intervals should be shorter if the engine is primarily used in saltwater or in water with high levels of sand or silt.

Q: OEM vs. Aftermarket?

A: 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.

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

A: 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.

Q: What is your warranty and return policy?

A: 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.