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)
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)