Product details:
Athena Big Bore Cylinder Kit (80cc) - 5.50mm Oversize to 50.00mm, 12.8:1 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.