Water Pump Impeller – Fits Yamaha 20/25 HP F20/F25 2/4-Stroke (Replaces 6L2-44352-00-00)

Water Pump Impeller – Fits Yamaha 20/25 HP F20/F25 2/4-Stroke (Replaces 6L2-44352-00-00)

This water pump impeller is a direct replacement component for specific Yamaha 2-stroke and 4-stroke outboard motors. It is engineered to restore proper cooling system function by ensuring consistent water circulation through the engine. This part fits Yamaha 2-Stroke 20 HP (1996–1997) and 25 HP (1988–2009) models, as well as Yamaha 4-Stroke F20 (2018–2021) and F25 (2016–2021) models.

It serves as a direct replacement for Yamaha OEM part number 6L2-44352-00-00 and several aftermarket equivalents.

• Designed as a direct-fit replacement for straightforward installation.
• Constructed from high-quality neoprene rubber for durability and reliable performance.
• Includes one water pump impeller component.

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.

Yamaha 2-Stroke Outboard Engines

Yamaha 4-Stroke Outboard Engines

Technical Specifications

Package Contents

This package includes the following item:

• 1 x Water Pump Impeller (Replaces 6L2-44352-00-00)

Installation Guide

Professional installation is recommended. The following are general steps and may vary depending on your specific engine model. Always refer to a service manual for detailed instructions.

1. Disconnect Battery: Ensure the engine is off and disconnect the battery terminals to prevent accidental starting.
2. Remove Lower Unit: Unbolt and carefully lower the gearcase (lower unit) from the outboard motor's midsection.
3. Access Impeller Housing: Locate and unbolt the water pump housing cover.
4. Remove Old Impeller: Carefully slide the old impeller off the drive shaft. Note the orientation of the blades and the position of the drive key.
5. Clean and Inspect: Clean any debris from the housing, wear plate, and cover. Inspect all components for scoring, warping, or corrosion and replace if necessary.
6. Install New Impeller: Lightly lubricate the inner housing and install the new impeller. Align the key slot on the impeller with the key on the drive shaft and rotate the shaft clockwise to seat the blades correctly.
7. Reassemble Housing: Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
8. Reattach Lower Unit: Guide the lower unit back into place, ensuring the water tube and drive shaft align correctly. Secure all bolts.
9. Test Operation: Reconnect the battery. Start the engine in a test tank or with a water flusher to confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How can I confirm this impeller fits my Yamaha engine?
Start by checking your engine's model and year against the "Compatible Engine Models" list on this page. For additional certainty, you can cross-reference the OEM part number 6L2-44352-00-00 with the one listed in your engine’s service manual. Our Yamaha Serial Number Guide can also help you identify your model.

What are the signs of a failing water pump impeller?
Key indicators include the engine overheating (especially at idle), a weak or intermittent water stream from the tell-tale outlet, or a complete lack of water flow. Upon inspection, a worn impeller will have cracked, brittle, or permanently curved blades.

How often should I replace my water pump impeller?
As a preventative maintenance measure, it is best to replace the impeller every 1-2 years or every 100-200 hours of operation. If you frequently operate in saltwater or sandy/silty conditions, annual replacement is strongly recommended.

Is this an OEM part?
This listing is an aftermarket replacement part, not an OEM component. We manufacture our parts to meet or exceed OEM specifications using high-quality, comparable-grade materials. Production takes place in an ISO9002-certified facility, and each batch is inspected to ensure consistent performance and fit.

How fast do you ship and what are the costs?
We offer fast global shipping, with most orders arriving within 5–15 days worldwide. Standard shipping is free. Depending on your location, expedited shipping options may be available at checkout.

What is your warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted for unused items in their original condition within our standard return window; see our policy page for full details.

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.