ATHENA Race Gasket Kit Yamaha R4856-199

Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to optimize engine compression ratios, Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression, Kits do not include valve stem seals, rubber parts, shims, or other fiber gaskets