Athena Top End Gasket Kit - Yamaha - P400485600069

Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. 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 do not includes valve stem seals, rubber part, shims or other fiber gaskets..