Water Pump Impeller – Fits Yamaha 20HP & 25HP Outboards (Replaces 6L2-44352-00-00)

Water Pump Impeller – Fits Yamaha 20HP & 25HP Outboards (Replaces 6L2-44352-00-00)

This water pump impeller is a direct replacement for Yamaha 2-stroke 20HP (1996-1997) and 25HP (1988-2009) outboard engines. It also fits Yamaha 4-stroke F20 (2018-2021) and F25 (2016-2021) outboard motors.

Ensures your engine's cooling system operates efficiently by replacing a worn or damaged impeller. This component is built to meet or exceed OEM specifications for reliable performance.

• Material: Constructed from durable neoprene rubber with a hardened nylon hub for longevity.
• Installation: Designed for a direct fit, replacing the original OEM part without modifications.
• Blades: Features a 6-blade design for optimal water flow and cooling.

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 Models

Yamaha 4-Stroke Models

Technical Specifications

Package Contents

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

Installation Guide

1. Disconnect the negative battery cable to prevent accidental starting.
2. Place the outboard in neutral and remove the bolts securing the lower unit (gearcase).
3. Carefully separate the lower unit from the upper housing, disconnecting the shift shaft if necessary.
4. Locate the water pump housing on top of the gearcase and remove its mounting bolts.
5. Slide the housing up and off the driveshaft to expose the old impeller. Note the rotational direction of the old blades.
6. Remove the old impeller and the drive key from the shaft. Clean any debris from the housing and wear plate.
7. Install the new drive key and slide the new impeller onto the driveshaft.
8. Rotate the driveshaft in its normal direction of operation (typically clockwise) while pushing down on the impeller to correctly fold the blades inside the housing.
9. Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
10. Reassemble the lower unit to the engine, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
11. Secure the lower unit with its mounting bolts.
12. Reconnect the battery, supply water to the engine using flushing muffs, and test run to confirm water is exiting the tell-tale port.

Troubleshooting & FAQ

How do I confirm this impeller fits my Yamaha engine?
This impeller is compatible with Yamaha 2-stroke 20HP (1996-1997) and 25HP (1988-2009) outboards, as well as 4-stroke F20 (2018-2021) and F25 (2016-2021) models. Always cross-reference your engine's original part number with 6L2-44352-00-00 or one of the listed aftermarket equivalents to ensure a perfect match.

What are the signs that my water pump impeller needs replacement?
Common signs of a failing impeller include a weak or intermittent water stream from the "tell-tale" outlet, engine overheating alarms, or visible damage like cracks, missing blades, and brittleness discovered during inspection.

How often should I replace the impeller?
As a general guideline, it is recommended to inspect your water pump impeller annually and replace it every 1-2 years or every 100-200 hours of use. Replacement frequency depends on operating conditions (e.g., saltwater versus freshwater use).

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.