Engineworx Gasket Kit (Full Set) Honda XR100R 92-03 CRF100F 04-13 Engineworx Full Gasket Kits are the new leader in OEM replacement engine gasket kits. Kits include all gaskets and oil seals as shown in the picture. All 4 Stroke head gaskets use Japanese stainless steel laminated head gasket and Viton valve seals, ensuring the best quality possible.