ATHENA Top End Race Gasket Kit - Yamaha R4856-199

Top End Race Gasket Kit - Yamaha
Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kit includes 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, Kit does not include valve stem seals, rubber parts, shims, or other fiber gaskets.