Yamaha 20/25HP Two-Cylinder 2-Stroke Water Pump Repair Kit – Fits Yamaha Outboard Motors (Replaces 6L2-W0078-00-00)

Yamaha 20/25HP Two-Cylinder 2-Stroke Water Pump Repair Kit – Fits Yamaha Outboard Motors (Replaces 6L2-W0078-00-00)

This water pump repair kit is designed for Yamaha 2-stroke outboard motors, specifically 20 HP and 25 HP two-cylinder models manufactured between 1988 and 2009.

It serves as a direct replacement for Yamaha OEM part number 6L2-W0078-00-00, ensuring reliable water pump service and proper maintenance of your engine's cooling system.

• Directly replaces OEM kit 6L2-W0078-00-00
• Fits Yamaha 20HP and 25HP two-cylinder 2-stroke outboards (1988–2009)
• Installs in the 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.

Technical Specifications

Package Contents

• 1 x Outer Plate, Cartridge (6L2-44323-00-00)
• 1 x O-Ring (93210-45161-00)
• 1 x Impeller (6L2-44352-00-00)
• 1 x Insert, Cartridge (6L2-44322-00-00)
• 4 x Bolt (97095-06040-00)
• 1 x Key, Woodruff (90280-03024-00)

Installation Guide

1. Disconnect the battery and shift linkage before beginning.
2. Unbolt and carefully lower the gearcase from the outboard's leg.
3. Locate and unbolt the water pump housing to access the old components.
4. Remove the old impeller, plate, and seals, and thoroughly clean all mating surfaces.
5. Install the new Woodruff key and slide the new impeller onto the driveshaft.
6. Place the new O-ring and cartridge insert into the housing.
7. Assemble the new water pump housing and outer plate, ensuring correct alignment.
8. Tighten the housing bolts to the manufacturer-specified torque.
9. Carefully reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube are correctly aligned.
10. Reconnect the shift linkage and battery.
11. Start the engine using a water supply (flushing muffs) and verify a steady stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Yamaha engine?
A: This kit fits Yamaha 20HP and 25HP two-cylinder 2-stroke models from 1988 to 2009. Please check the "Compatible Engine Models" table on this page and cross-reference your engine's model and year. Verifying the OEM part number 6L2-W0078-00-00 also ensures a match.

Q: What are the signs that my water pump needs to be replaced?
A: Common signs of a failing water pump include a weak or intermittent water stream from the tell-tale outlet, engine overheating alerts, or visible damage to the old impeller (cracked, brittle, or missing vanes) during inspection.

Q: How often should I replace the water pump kit?
A: For preventative maintenance, we recommend inspecting the impeller annually and replacing the entire water pump kit every 1-2 years or 100-200 hours of operation, especially if you frequently operate in saltwater or debris-heavy water.

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.