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. Specifically designed for the pro, semi-pro and amateur rider Freshens up their engine prior to a race or during mid-season Kits do not include valve stem seals, rubber part, shims or other fiber gaskets.. GASKET KIT TOP END KAW