Athena Big Bore Cylinder Kit (490cc) - 4.00mm Oversize to 100.00mm, 13:1 Compre P400510100016

• Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets
• Forged piston black graphite or clear tin coating; includes 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

STOCK BORE RACE CYLINDER KITS

• Two-stroke kits include an aluminum cylinder head with a removable bronze dome allowing for a higher compression ratio and anti-detonation features (except where noted)
• Athena top-end gasket set including required seals and hardware
• Two-stroke kits feature specially designed, high-performance, hard-anodized power valves (cannot use OEM)
• Specially designed, high-performance, Cast-Lite flat-top piston kit
• Include aluminum cylinder with nickel-carbide coating, ported to Factory Works specs
• Easy-to-follow, step-by-step installation instructions

BIG BORE RACE CYLINDER KITS

• Include aluminum cylinder with nickel-carbide coating
• Easy-to-follow, step-by-step installation instructions
• Athena top-end gasket set including required seals and hardware
• Specially designed, high-performance, hard-anodized power valves (cannot use OEM)
• Specially designed, high-performance, forged OEM-style domed piston kit