Water Pump Impeller – Fits Yamaha 20HP/25HP 2-Stroke Outboard Engines (Replaces 6G0-44352-00-00)

Water Pump Impeller – Fits Yamaha 20HP/25HP 2-Stroke Outboard Engines (Replaces 6G0-44352-00-00)

This water pump impeller is designed to fit Yamaha 20HP and 25HP 2-stroke outboard engines, specifically the 20A, 20B, and 25A series. It serves as a direct replacement component for maintaining your engine's cooling system.

It directly replaces Yamaha OEM part numbers 6G0-44352-00-00, 6G0-44352-03-00, 656-44352-00-00, 6G0-44352, and 94-44352-00.

• Installation Location: Mounts inside the lower unit water pump housing.
• Drive Type: Connects to the drive shaft via an internal keyed slot.
• Primary Component: Features a durable plastic hub with 6 rubber blades designed for efficient water circulation.

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 Water Pump Impeller (6G0-44352-00-00)
• 1 x Key (Note: inclusion of the key should be verified, as it may vary)

Installation Guide

1. Safety First: Disconnect the engine's battery and remove the spark plug wires.
2. Shift to Neutral: Ensure the gear shift is in the neutral position to disengage the shift shaft.
3. Remove Lower Unit: Loosen and remove the bolts securing the lower unit (gearcase) to the upper engine housing.
4. Access the Pump: Carefully lower the gearcase to expose the water pump, which is typically located on top of the unit.
5. Open Housing: Remove the bolts on the water pump housing cover to access the impeller.
6. Remove Old Impeller: Note the rotational direction of the existing impeller blades. Pry out or slide the old impeller off the drive shaft, and remove the key.
7. Clean and Inspect: Clean any debris or corrosion from the pump housing and wear plate.
8. Install New Impeller: Lightly lubricate the new impeller and housing interior with marine grease. Insert the key into the driveshaft and slide the new impeller on, turning the driveshaft clockwise to bend the blades correctly.
9. Reassemble: Re-install the pump housing cover and tighten the bolts to the manufacturer’s specified torque.
10. Reattach Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly before tightening the bolts.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: This part is confirmed to fit Yamaha 20A, 20B, and 25A series 2-stroke outboards. The most reliable method is to cross-reference the part number (6G0-44352-00-00) stamped on your original impeller. As model year ranges are not precise, verifying with your engine's serial number is recommended.

Q: What are the symptoms of a failing water pump impeller?

A: The most common signs are a weak or non-existent water stream from the "tell-tale" pisser outlet, frequent engine overheating alarms, and a noticeable reduction in engine performance under load.

Q: How often should I replace the impeller?

A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or 100-200 hours of use. Replacement frequency should be increased if operating in sandy, silty, or saltwater conditions.

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.