Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason Gives the rider a choice of using standard gas with stock compression,...

Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets Forged piston with molybdenum coating Special gasket kit Easy-to-follow step-by-step installation...

Superior-quality gasket sets from Athena Head gaskets feature rubber-coated spring steel construction Soft steel base gaskets are rubber coated Steel core materials feature high springback and...

Superior-quality gasket sets from Athena Head gaskets feature rubber-coated spring steel construction Soft steel base gaskets are rubber coated Steel core materials feature high springback and...

Superior-quality gasket sets from Athena Head gaskets feature rubber-coated spring steel construction Soft steel base gaskets are rubber coated Steel core materials feature high springback and...

All pistons are forged using a precision heat-treatment process that allows for extremely accurate production tolerances Most Forged piston kits are available in A, B and C sizing Forged piston...

All pistons are forged using a precision heat-treatment process that allows for production tolerances of just .005mm Forged piston tooling allows for the lightest available product Kits include...

All pistons are cast using a precision heat-treatment process that allows for production tolerances of just .005mm Forged piston tooling allows for the lightest available product Kits include...

Manufactured in State-of-the-Art computer controlled facilities All gaskets made from the highest quality materials All gasket sets meet or exceed OEM specifications The best gaskets available...

Replace that worn out powervalve To be used with Athena cylinder and head assemblies only Compatible Vehicles Years Make Make Notes 2005-2021 Yamaha YZ125 2020-2022 Yamaha YZ125X

All pistons are forged using a precision heat-treatment process that allows for production tolerances of just .005mm Forged piston tooling allows for the lightest available product Kits include...

Kits include aluminum cylinder with galvanic coating design Forged piston with molybdenum coating Special gasket kit Easy-to-follow step-by-step installation instruction Compatible...