Boyesen WPK-37B Supercooler Black High-Performance Water Pump Kit - Universal Fit for Dirt Bikes & ATVs - Improves Engine Cooling for Off-Road Racing & Trail Riding

The Boyesen Supercooler water pump kit is an aluminum investment cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system. This high flow, hydrodynamic water pump kit has been tested and designed to flow more coolant. By increasing the flow, the engine will run cooler at a more constant temperature. Fits: Yamaha YZ250 2001-2012.

Fits Yamaha YZ250 2001-2012

By casting a totally new water pump cover, Boyesen was able to maximize the flow through the unit; Boyesen's design takes advantage of everything from Bernoulli's effect to biological studies

Unlike the stocker, Boyesen's water inlet has an increasing diameter and artfully curved shape; this is a vast improvement over most stock inlets, which decrease in diameter as they near the impeller and have a 90-degree bend at the pump

Patented nautilus style impeller for hydrodynamic efficiency, reducing heat, gaining horsepower and extending engine life