Athena Big Bore Cylinder Kit (365cc) - 2.00mm Oversize to 90.00mm, 14:1 Compression S4F09000050 Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets Includes Forged piston, rings, clips and pin Athena top-end gasket set includes required seals and hardware Easy-to-follow step-by-step installation instructions Most are bolt-on; no machining required except where noted