Boyesen Impeller/Waterpump Cover - Magnesium - Yamaha Wpk-38M

• 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 at all rpm ranges, the engine will run cooler at a more constant temperature
• Patented nautilus style impeller for hydrodynamic efficiency
• Extend engine life

Yamaha -- WR 426 F -- (2001, 2002, 2000); Yamaha -- WR 450 F -- (2005, 2006, 2003, 2004, 2007, 2009, 2008, 2010, 2013, 2014, 2011, 2012, 2015); Yamaha -- YZ 450 F -- (2003, 2004, 2005, 2006, 2007, 2009, 2008); Yamaha -- YFZ 450 4x2 -- (2007, 2008, 2004, 2006, 2005, 2009, 2012, 2013); Yamaha -- YZ 426 F -- (2002, 2001, 2000)