6G0-44352 Water Pump Impeller for Yamaha 20A 20B 25A | JLM Marine

Water Pump Impeller – Fits Yamaha 2-Stroke 20–25 HP Outboards

This aftermarket water pump impeller is engineered for Yamaha 2-stroke outboard motors rated at 20 HP and 25 HP, specifically models 20A, 20B, and 25A. It delivers reliable cooling performance to keep your engine running at optimal temperature during operation.

Direct replacement for Yamaha OEM part numbers 6G0-44352-00, 6G0-44352-01, and 6G0-44352-03, ensuring seamless compatibility with your original pump housing.

• Constructed from durable neoprene for consistent water flow and longevity
• Drop-in replacement – installs into existing water pump assembly
• Essential maintenance part to prevent overheating and engine damage

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 × Water Pump Impeller

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor according to your service manual.
2. Remove the water pump housing cover and take note of the orientation of the old impeller before removal.
3. Carefully extract the old impeller from the pump housing, inspecting the housing and plate for wear or damage.
4. Clean the pump housing thoroughly, removing any debris, corrosion, or old gasket material.
5. Lubricate the new impeller with glycerin or water pump grease (never use petroleum-based products).
6. Insert the new impeller into the housing, ensuring the blades are oriented in the correct rotation direction.
7. Replace the gasket and reinstall the pump housing cover, tightening bolts evenly to manufacturer torque specifications.
8. Reinstall the lower unit onto the motor, ensuring proper alignment and secure fastening.
9. Reconnect the fuel line and run the engine in a test tank or on muffs to verify proper water flow from the telltale.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha outboard?
A: Cross-reference your engine model (20A, 20B, or 25A) with the compatibility table above. You can also verify by checking your current impeller's OEM part number (6G0-44352-00, 6G0-44352-01, or 6G0-44352-03) stamped on the pump housing or in your service manual.

Q: How often should I replace the water pump impeller?
A: Yamaha recommends inspecting the impeller annually and replacing it every 2–3 years or 200–300 hours of operation, whichever comes first. If you operate in sandy, silty, or debris-laden water, inspect and replace more frequently.

Q: What are the signs of a failing impeller?
A: Common symptoms include reduced or no water flow from the telltale (pilot hole), engine overheating, steam from the powerhead, or loss of power. If you notice any of these, shut down immediately and inspect the impeller.

Q: Can I use petroleum-based grease when installing this impeller?
A: No. Petroleum products will degrade the neoprene material and cause premature failure. Always use glycerin, water pump grease, or a small amount of liquid dish soap for lubrication during installation.

Q: Is this an OEM or aftermarket part?
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.