Description
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. Can reduce engine temperatures by as much as ten degrees . Fits: Yamaha YZ125 2005-2019