Namura TOP END REBUILD KIT NA-40009-BHK2 fits 2004-2009, 2012-2013 Yamaha YFZ450 / 2009-2017 Yamaha YFZ450R / 2017 Yamaha YFZ450RSE / 2010-2011 Yamaha YFZ450X / 2006-2007 Yamaha YFZ450V Bill Balance Edition / 2007 Yamaha YFZ450SE Special Edition

Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket kitMOS2 (Teflon/Molybdenum) Coated Skirts A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizuresMachined Smooth Heads Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%Anodized Domes Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistonsHypereutectic Casting Process Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures