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

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

This high-quality aftermarket water pump impeller is engineered for Yamaha 2-stroke outboard motors rated 20 HP and 25 HP, specifically fitting models 20A, 20B, and 25A. Designed to maintain optimal cooling performance, this impeller ensures reliable water flow through your engine's cooling system, preventing overheating and extending motor life.

This impeller serves as a direct replacement for Yamaha OEM part numbers 6G0-44352-00, 6G0-44352-01, and 6G0-44352-03, delivering equivalent fit and function at exceptional value. Manufactured from durable neoprene rubber, it withstands the demanding marine environment while providing dependable service.

• Includes matching key/pin for secure installation
• Compatible with Yamaha 2-stroke 20 HP and 25 HP engines
• Drop-in replacement—no modifications required

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 × Outboard Rubber Impeller with Key/Pin

Installation Guide

1. Disconnect the fuel line and remove the engine cowling to access the lower unit. Ensure the engine is completely cool before beginning work.
2. Remove the lower unit by loosening the mounting bolts and gently separating it from the mid-section. Support the unit carefully to avoid damage.
3. Locate the water pump housing on top of the lower unit. Remove the housing bolts and carefully lift off the pump cover.
4. Extract the old impeller by gently pulling it from the pump housing. Note the orientation of the vanes for proper installation of the new impeller.
5. Clean the pump housing thoroughly to remove any debris, corrosion, or remnants of the old gasket. Inspect for wear or damage.
6. Lubricate the new impeller with glycerin or marine-grade grease (never petroleum-based products). Coat all vanes generously.
7. Insert the key/pin into the impeller shaft slot, ensuring it is fully seated. The key aligns the impeller with the drive shaft.
8. Install the new impeller into the housing, aligning the key with the driveshaft slot. Rotate the impeller clockwise while pressing down gently until fully seated.
9. Position the vanes correctly—they should all curve in the direction of impeller rotation. Verify proper alignment before reassembly.
10. Replace the pump housing gasket and reinstall the pump cover. Torque bolts to manufacturer specifications in a crisscross pattern.
11. Reattach the lower unit to the mid-section, ensuring proper alignment of the driveshaft and water tube. Tighten all mounting bolts securely.
12. Test the system by running the engine in a test tank or on-the-water. Verify strong water flow from the telltale (pee hole) within 15–30 seconds of startup.

Troubleshooting & FAQ

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

Q: How often should I replace my 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. Replace immediately if you notice reduced water flow, overheating, or visible vane damage.

Q: What are the signs that my impeller is failing?
A: Common symptoms include weak or no water discharge from the telltale, engine overheating, steam from the engine, reduced performance, or alarm activation. Inspect the impeller if any of these occur.

Q: Can I use petroleum-based grease when installing the impeller?
A: No. Petroleum-based products will damage the neoprene rubber and cause premature failure. Use only glycerin, dish soap, or dedicated marine impeller grease during installation.

Q: What's the difference between this aftermarket impeller and the OEM version?
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.