Race Cam, 88cc Big Bore kit, and 20mm Carburetor Performance Kit:

- Lightweight aluminum cylinder with steel sleeve

- Cast in mounts on cylinder for aftermarket skid plates

- Oversized cooling fins on cylinder for efficient heat dissipation

- tbwo365 52mm piston with rings, pin, & clips

- Head gasket kit

- High performance race camshaft (11/4/04 - Updated camshaft - more aggressive lift and duration without sacrificing low end torque)

- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware/wrench, air filter (not shown in pic) and long throttle cable (11/4/04 - Updated throttle cable - a new type is provided that allows for more adjustment and will work on wider selection of throttles)

We recommend purchasing a high volume oil pump kit (available in this section).

Installation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).

Kit works with

XR70 -CRF70

China 50-70

NOT FOR CRF50 / XR50 with STOCK HEAD