OEM-style standard bore kits include a cast aluminum Cylinder Works cylinder, Vertex Piston and gaskets needed to restore horsepower and performance, as a competitive price point, compared to OEM options.

This Part Fits:

Year	Make	Model	Submodel
2007-2015	Yamaha	WR450F	Base
2009-2019	Yamaha	YFZ450R	Base
2010-2011	Yamaha	YFZ450X	Base