Dirt Bike

These sets include all gaskets and oil seals necessary to rebuild the engine and transmission including output shaft, waterpump, clutch, shift and starter seals.

The first and only asymmetrical piston for 250cc and 450cc applications!100% fully machined billet pistonDyno proven power gainsExclusive custom lapped top ring and matching precision machined ring groove provide improved ring seal and break-inArmorGlide...

The all-new VForce4R has been designed to offer you exceptional durability and overcome the shortcomings of the stock reed valve system.

Superior quality gasket sets from Athena S.P.ASteel core materials feature high springback and superior tensile strengthRevolutionary transparent coating guarantees a perfect seal even at extremely high temperaturesHigh-temperature blue silicone beading...

Superior quality gasket sets from Athena S.P.ASteel core materials feature high springback and superior tensile strengthRevolutionary transparent coating guarantees a perfect seal even at extremely high temperaturesHigh-temperature blue silicone beading...

Stainless steel valves are manufactured to exacting tolerances from the highest-grade material; coated for longevity and peak performance

Stage 1: single-cam motor. Stage 1 has improved power at all RPMs over OEM. Performs well with stock air box lid and exhaust. Uses stock valve springs and rockers. Uses stock auto-decompression mechanism.

Stage 1 ITR: Dual cam engineIntake and exhaust cams sold separatelyExcellent low end to midrange gainsUses stock valve springs

Stage 1 ITR: Dual cam engineIntake and exhaust cams sold separatelyExcellent low end to midrange gainsUses stock valve springs

Spring sets are made of heavy-duty steel and outperform originalsSpring sets contain springs only

Spring sets are made of heavy-duty steel and outperform originalsSpring sets contain springs only

Spring sets are made of heavy-duty steel and outperform originalsSpring sets contain springs only