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

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

This water pump repair kit is designed for Yamaha 2-Stroke outboard motors, including 20HP (1996–1997) and 25HP two-cylinder (1988–2009) models. It provides a reliable solution for maintaining your engine'''s cooling system.

Engineered as a direct replacement for Yamaha part number 6L2-W0078-00-00, this kit ensures proper fit and function, restoring cooling performance to factory specifications.

• Installation Method: Direct OEM replacement
• Engine Compatibility: Fits select Yamaha 2-Stroke outboard engines
• Complete Kit: Includes a neoprene impeller, housing, plate, O-ring, bolts, and key for a full service.

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 with washer (97095-06040-00)
• 1 x Woodruff Key (90280-03024-00)

Installation Guide

Professional installation is recommended. The following are general steps for replacing the water pump kit:

1. Safety First: Disconnect the engine'''s battery and remove the spark plug wires.
2. Lower Unit Removal: Place the outboard in neutral. Unbolt and carefully remove the lower unit (gearcase) from the engine leg.
3. Access the Pump: Locate and unbolt the water pump housing, which is situated on top of the lower unit.
4. Disassemble: Carefully remove the old housing, impeller, wear plate, gaskets, and seals. Take note of their orientation.
5. Clean Surfaces: Thoroughly clean the mating surfaces on the lower unit and driveshaft to ensure a proper seal.
6. Install New Components: Install the new cartridge insert and outer plate. Apply a light coat of marine grease to the inside of the new housing.
7. Install Impeller: Slide the new Woodruff key into its slot on the driveshaft and then install the new impeller. Rotate the driveshaft clockwise while pushing down to seat the blades correctly.
8. Reassemble Pump: Place the new O-ring in the housing groove and install the housing over the impeller. Secure it with the new bolts, tightening them to the manufacturer-specified torque in a crisscross pattern.
9. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, water tube, and shift shaft align properly.
10. Final Checks: Reinstall the lower unit bolts and tighten them securely. Reconnect the shift linkage, spark plug wires, and battery.
11. Test Operation: Start the engine in a suitable water source (using a flush attachment or in the water) and confirm a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my Yamaha engine?
Check your engine model and manufacturing year against the detailed "Compatible Engine Models" table. This kit is specifically designed for Yamaha 20HP (1996-1997) and 25HP (1988-2009) two-cylinder, 2-stroke outboards. You should also verify that your existing part number matches one of those listed in the cross-reference table for a guaranteed fit.

What are the signs my water pump is failing?
A common sign of a failing water pump is a weak or intermittent water stream from the engine'''s tell-tale outlet. Other indicators include engine overheating alarms or steam coming from the exhaust. During a visual inspection, a cracked, brittle, or heavily worn impeller indicates an immediate need for replacement.

How often should I replace the water pump kit?
As a crucial part of preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every 1 to 2 years, or every 100-200 hours of engine use. Replacement intervals should be shorter if the engine is operated frequently in sandy, silty, or saltwater environments.

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.