Works Cylinder Kit Yz125 54Mm P400485100003Cylinder Stock Bore Race Kit for 2 StrokeAluminum cylinder is nickel carbide coated designed with larger water jackets Specially designed, high performance, hard anodized power valves (cannot use OEM) There is an aluminum cylinder head with a removable bronze dome allowing for a higher compression ratio and anti detonation features (except where noted) Kit also includes a Cast Lite flat top piston kit, and an Athena top end gasket set that includes