Moose can now handle all your gasket and seal needs at a fraction of OEM cost High-tech materials provide unmatched reliability and performance Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit Oil seals are genuine OEM replacement seals Performance sets designed for a piston replacement 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 Does not include formed rubber valve cover gasket Formed valve cover gaskets are included in complete kit with oil seals 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 U.S.A.. TOP END GSKT YFM350/400