Engineworx Gasket Kit (Full Set) KTM SX400 98-02 EXC400 00-02 EXC450 03-07 Engineworx Full Gasket Kits are the new leader in OEM replacement engine gasket kits. Kits include all gaskets and oil seals necessary to rebuild the engine and transmission including head & base gaskets, clutch gaskets, crankcase gaskets where necessary, output shaft, water pump, clutch, shift and starter seals. All 4 Stroke head gaskets use Japanese stainless steel laminated head gasket and Viton valve seals, ensuring the best quality possible.