Cylinder Works 09-12 Honda CRF 450 R 450cc +3mm Big Bore Cylinder Kit 478cc 12.0:1 Comp. 99mm

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.