Boyesen Impeller Water Pump Cover - Black - Yamaha - WPK-31AB

An aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engine’s cooling system. High-flow, hydrodynamic water pump kit has been tested and designed to flow more coolant. By increasing the flow at all rpm ranges, the engine will run cooler at a more constant temperature. Nautilus-style impeller for hydrodynamic efficiency. Extend engine life.