Dirt Bike

All pistons are heat treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeCast piston kits are gravity cast aluminum alloy (not...

All pistons are heat treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeCast piston kits are gravity cast aluminum alloy (not...

All pistons are heat treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeCast piston kits are gravity cast aluminum alloy (not...

All pistons are heat treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeCast piston kits are gravity cast aluminum alloy (not...

Kit contains crankshaft, main bearing/seals and complete gasket set for complete installationFor Models: 2003 - 2005 Kawasaki KX 125

Kit contains crankshaft, main bearing/seals and complete gasket set for complete installationFor Models: 2007 - 2012 Kawasaki KX 85

2003 - 2005 Yamaha YZ 450F

TR Design-Single-cam motorLow and mid RPM torque are increasedTop horsepower slightly increased over stockUses stock auto-decompression mechanismUses stock valve springs

The Big Gun Evo Racing Series was designed to deliver maximum horsepower & torque gains throughout the RPM range. Made from .049 stainless steel tubing & an aluminum muffler canister, the Evo exhaust system is much lighter than stock units. Our...

Stage 1 ITR: Dual cam engine Intake and exhaust cams sold separately Excellent low end to midrange gains Uses stock valve springs

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.

Includes crankshaft, main bearings, complete bottom end gasket set, including all seals and gaskets needed for the jobThe crank pin bearings are manufactured from the highest quality hot rolled steel. Case hardened to 58-62CThe caged needle roller...