Gasket Kit Top End Yam P400485600063Top End Gasket KitSpecifically 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 Kits include a top of the line MLSS head