OEM in apperance, yet performance driven in design. The Cylinder Works Big Bore Cylinder Kits contain a hand matched big bore Vertex piston and top end gasket kit wtih o-rings in an all-in-one kit, providing cost savings over purchasing OEM components separately.

This Part Fits:

Year	Make	Model	Submodel
2007-2015	Yamaha	WR450F	Base
2006-2009	Yamaha	YZ450F	Base