Cylinder Works 03-06 Yamaha WR 450 F 450cc +3mm Big Bore Cylinder Kit 478cc 12.5:1 Comp. 98mm

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.