Athena P400210100059 Stock Bore Race Cylinder Kits

Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets.
Easy-to-follow step-by-step installation instructions.
Most are bolt-on; no machining required except where noted.
Include aluminum cylinder with nickel-carbide coating, ported to Factory Works specs.
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).
Two-stroke kits feature specially designed, high-performance, hard-anodized power valves (cannot use OEM).
Easy-to-follow, step-by-step installation instructions.


Vehicle Fitment:

Honda CRF450R 2017-2021