Top End Gasket Kit - Yamaha Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are OEM seals, Performance sets designed for a piston , Includes every gasket, O-ring and seal required to rebuild a top end; valve seals, head, base, exhaust, tensioner, and other misc. gaskets and O-rings, High-compression kits use .012" thick base gaskets to raise compression, Cost-effective way to raise compression without expensive high-compression pistons or cylinder head work, All gaskets made in the USA, Does not include formed rubber valve cover gasket.