Water Pump Impeller with Key for Yamaha XF425 & XF450 4-Stroke Outboards – OEM 6GR-44352-00-00

Product Details

This water pump impeller with key is intended for Yamaha XF425 and XF450 4-stroke outboard motors. It is supplied as a replacement impeller with the drive key required for installation, helping restore water-pump circulation and support normal engine cooling.

The listed Yamaha OEM reference for this impeller is 6GR-44352-00-00. Confirm the complete engine model and existing part number before ordering.

• Single replacement water pump impeller supplied with one drive key
• Application listed for Yamaha XF425 and XF450 4-stroke outboard engines
• Designed to restore water circulation through the outboard cooling system
• Replacement reference: Yamaha OEM 6GR-44352-00-00

Part Number Information

Use the following reference to compare the replacement with the part installed on your engine.

Engine & Model Compatibility

The company application information identifies the following Yamaha outboard models. Verify the model designation and the part number on your original impeller before installation.

Technical Specifications

Product Type

Water pump impeller with drive key

Brand Application

Yamaha Outboard

Compatible Models

XF425 and XF450

Stroke

4-Stroke

OEM Reference

6GR-44352-00-00

Product Configuration

Single replacement impeller supplied with key; not a complete water pump assembly

What's in the Box

• One water pump impeller
• One drive key

The package does not include the water pump housing, cover, plate, gaskets, O-rings, seals, water tube components, or a complete water pump kit.

Installation Notes

1. Disconnect the battery, place the boat securely, and ensure the engine is switched off and cool before beginning work.
2. Remove the lower unit according to the service procedure for your specific Yamaha engine.
3. Access the water pump housing and remove the cover and related hardware carefully.
4. Remove the old impeller and inspect the pump housing, wear surfaces, plate, drive shaft, and keyway for scoring, corrosion, or debris.
5. Remove any damaged or worn key and clean the installation area before fitting the replacement parts.
6. Use glycerin, dishwashing liquid, or another suitable water-based lubricant during installation. Do not use petroleum-based lubricant on the rubber impeller.
7. Install the drive key in the drive shaft slot and ensure it is seated correctly.
8. Fit the impeller over the key and shaft, rotating the blades in the correct direction for the pump housing.
9. Reinstall the pump housing and cover, ensuring all reusable or replacement seals and gaskets are properly seated.
10. Reinstall the lower unit and tighten fasteners according to the applicable Yamaha service manual specifications.
11. Run the engine with an adequate water supply and check the tell-tale, cooling-water flow, operating temperature, and the lower-unit area for leaks.

Troubleshooting & FAQ

How do I know when the impeller needs to be replaced?

Common warning signs include engine overheating, reduced or irregular tell-tale water flow, damaged or missing blades, cracking, hardening, or visible deformation. Follow the maintenance interval and inspection procedure specified in your engine's service manual.

Will this impeller fit both the XF425 and XF450?

The company application information lists both Yamaha XF425 and XF450 4-stroke outboard models. Confirm your complete engine model, stroke, and original impeller reference before ordering.

Is the drive key included?

Yes. This product is supplied as one water pump impeller with one drive key.

Is this a complete water pump kit?

No. This is a single replacement impeller supplied with its drive key. The water pump housing, cover, plate, gaskets, O-rings, seals, and other pump components are not included.

What lubricant should be used during installation?

Use glycerin, dishwashing liquid, or another water-based lubricant. Avoid petroleum-based products because they may damage or swell the rubber impeller.

Can I install the impeller myself?

Installation requires lower-unit removal and correct pump reassembly. If you have the required tools and mechanical experience, follow the service manual for your exact engine. Professional installation is recommended when the correct orientation, seals, or torque specifications are uncertain.

What can cause premature impeller failure?

Possible causes include running the engine without an adequate water supply, debris or sand entering the cooling system, a worn or scored pump housing, incorrect installation, chemical or heat damage, and normal rubber wear.

Safety & Important Information

• Verify the full engine model, 4-stroke configuration, and OEM reference before purchase.
• This product is a replacement impeller with key, not a complete water pump assembly.
• Do not operate the engine without an adequate cooling-water supply.
• Use the applicable Yamaha service manual for disassembly, reassembly, and torque specifications.
• Professional installation is recommended if you are unfamiliar with lower-unit or water-pump service.