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

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

This water pump impeller is designed to fit specific Yamaha 2-stroke outboard models, including the 20HP (20A, 20B series) and 25HP (25A series). It serves as a direct-fit replacement, helping to restore your engine's cooling system performance.

This part is a direct replacement for Yamaha OEM part numbers: 6G0-44352-00-00, 656-44352-00, 6G0-44352-03, and 94-44352-00. Always verify part compatibility before installation.

• Installation Method: Installs directly with a key on the driveshaft.
• Material Composition: Made from a durable neoprene/rubber compound with a plastic hub for reliable performance.
• Critical Note: Users must verify the impeller’s dimensions against their original part before purchase to ensure correct fitment.

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)

Installation Guide

1. Safety First: Disconnect the engine's battery before starting work.
2. Access the Lower Unit: Remove the lower unit (gearcase) from the outboard motor.
3. Remove Pump Housing: Unbolt and carefully lift the water pump housing off the driveshaft.
4. Inspect Old Impeller: Note the orientation of the impeller blades before removing it.
5. Remove Old Impeller: Slide the old impeller off the driveshaft and remove the Woodruff key.
6. Clean and Inspect: Thoroughly clean the inside of the pump housing and wear plate. Check for scoring, warping, or damage.
7. Install New Impeller: Place the new key in its slot on the driveshaft. Slide the new impeller on, rotating the driveshaft clockwise to help bend the blades correctly inside the housing.
8. Reassemble: Reinstall the water pump housing, ensuring any gaskets or o-rings are properly seated. Tighten bolts to the manufacturer's torque specifications.
9. Final Steps: Reattach the lower unit to the engine, reconnect the battery, and test the engine using a water supply to confirm proper water flow.

Troubleshooting & FAQ

How do I confirm this impeller fits my Yamaha engine?

First, check that your engine is a Yamaha 2-Stroke 20A, 20B, or 25A series. It is critical to also verify the dimensions of your original part against our specifications: Outer Diameter (69.08 mm), Height (13.08 mm), and Internal Shaft Insert Diameter (13.72 mm). Do not order if these do not match.

How often should I replace my water pump impeller?

As a preventative maintenance measure, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 hours of use. This interval may be shorter if you operate primarily in saltwater or sandy/silty conditions.

What are the signs of a failing impeller?

Common symptoms of a worn or damaged impeller include the engine overheating at idle or low speeds, a weak or no water stream from the "tell-tale" pisser outlet, or finding brittle, cracked, or melted blades during an inspection.

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.