Boyesen WPK-37M; Water Pump Cover & Impeller Kit Magnesium

An aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engine's cooling system This 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 Patented nautilus-style impeller for hydrodynamic efficiency Fitment 2001-2013 Yamaha WR250F 2001-2013 Yamaha YZ250F

High efficiency water pump and cover for increased engine cooling; Investment cast from aluminum alloy for lightweight strength; Same footprint as stock parts for bolt-on installation without specialgaskets or fitment; High-flow impeller moves more coolant than stock parts; Less cavitation on impeller means better efficiency and longer impellershaft life; Higher flow rate with larger diameter passages and low-friction internalsurfaces