Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. 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 Specifically designed for the pro, semi-pro and amateur rider Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression Freshens up their engine prior to a race or during mid-season Kits do not include valve stem seals, rubber parts, shims, or other fiber gaskets Kits do not include valve stem seals, rubber part, shims or other fiber gaskets.