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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 KITSEasy-to-follow step-by-step installation instructions – 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 notedSpecially designed high-performance Cast-Lite flat-top piston kit – Two-stroke kits feature specially designed high-performance hard-anodized power valves cannot use OEMInclude aluminum cylinder with nickel-carbide coating ported to Factory Works specs – Athena top-end gasket set including required seals and hardware – BIG BORE RACE CYLINDER KITSEasy-to-follow step-by-step installation instructions – Specially designed high-performance forged OEM-style domed piston kit – Athena top-end gasket set including required seals and hardware – Include aluminum cylinder with nickel-carbide coating – Specially designed high-performance hard-anodized power valves cannot use OEM