Boyesen Supercooler Water Pump Cover & Impeller Kit WPK-08B (Black) — Honda TRX450R / 2004-2005

Product Description

The Boyesen WPK-08B Black Supercooler Water Pump Cover and Impeller Kit is an essential cooling performance upgrade designed specifically for your 4-stroke ATV. Purpose-built to eliminate thermal fade and prevent overheating on high-performance quads, this hydrodynamic kit increases coolant flow across all engine RPM ranges to keep your engine running cooler and at a more consistent operating temperature.

Investment-cast from premium aluminum and finished in a durable black powder coat, the Supercooler kit features Boyesen’s patented nautilus-style impeller. By optimizing fluid dynamics and minimizing cavitation, this high-flow system reduces engine operating temperatures, protects internal engine components, and extends overall top-end and bottom-end service life during intense trail riding or race conditions.

Top Features: Boyesen Supercooler Water Pump Kit

• Investment-cast aluminum construction with a durable black powder-coated finish for extreme durability and corrosion resistance.
• Patented nautilus-style impeller design maximizes hydrodynamic efficiency and eliminates fluid cavitation.
• Significantly increases coolant flow across all RPM ranges to maintain lower, more stable engine operating temperatures.
• Helps prevent overheating, reduces thermal breakdown of engine oil, and extends overall engine service life.
• Direct-bolt replacement kit designed specifically for factory Honda 450 quad water pump housings.

Please review the detailed compatibility data below to ensure an exact fitment match for your vehicle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Does this kit require modifications to my engine cases or cooling hoses?
A: No, the Boyesen Supercooler is designed as a direct bolt-on replacement for the stock water pump cover and impeller, retaining OEM-style hose routings and mounting locations.

Q: What is the benefit of the patented nautilus-style impeller?
A: The unique curved blade hydrodynamic design prevents coolant cavitation at high RPMs, allowing the pump to push a higher volume of fluid steadily through the radiators.

Expert Pro-Tip: Always perform a thorough cooling system flush and replace your engine coolant with fresh performance fluid when installing a new water pump kit. Inspect the water pump mechanical seal and drive shaft for wear before torquing the cover bolts to factory specifications.

Recommended Pairings:

• Honda TRX450R Performance Parts & Accessories
• ATV & Quad Performance Parts
• High-Performance Engine Coolants & Fluids

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