Dirt Bike

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...

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...

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...

 Stage 1: Dual cam engine. Intake and exhaust cams sold separately. Good midrange and top-end increase. Cam uses stock auto-decompression mechanism. Uses stock valve springs.

 Stage 1: Dual cam engine. Intake and exhaust cams sold seperately. Improved mid range gain with great top end gain and over rev. Uses stock valve springs. OE fuel mapping is acceptable, but could be fine tuned

 Stage 1: single-cam motor. Excellent midrange and top-end power increase. Uses stock valve springs and rockers. *Does not use auto-decompression mechanism.

OEM-style statorsDirect plug-in stators complete with all rubbers and OEM-style plug end (unless noted)

Kits include aluminum cylinder with nickel-carbide coating designed with larger water jacketsIncludes Forged piston, rings, clips and pinAthena top-end gasket set includes required seals and hardwareEasy-to-follow step-by-step installation...

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...

Forged from high-silicon aluminum alloy for maximum strength and dependability.Innovative forging design and piston skirt provide maximum horsepower and torque.Wiseco High-Performance piston kits are priced with piston, rings, pins and circlips (unless...

Forged from high-silicon aluminum alloy for maximum strength and dependability.Innovative forging design and piston skirt provide maximum horsepower and torque.Wiseco High-Performance piston kits are priced with piston, rings, pins and circlips (unless...

Affordable premium quality replacement connecting rodsHigh-tech crank and wrist bearingsAISI carburized crank pinSilver-coated crank pin bearingA.E. recommended phosphor bronze thrust washersForged from 8620 AISI steel, hardness-tested to insure strength...