Athena Big Bore Cylinder Kit (276cc), 4.00mm Oversize to 81.00mm Bore, 13.6:1 Compression

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 .