Cylinder Works 02-18 Yamaha YZ 85 85cc +5mm Big Bore Cylinder Kit 107.8cc 8.2:1 Comp. 52.5mm

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.