Athena Big Bore Cylinder Kit (144cc) - 4.00mm Oversize to 58.00mm, 14:1 Compression - P400485100030

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