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TB Race Cam, 88cc Bore & 20mm Carb Kit CRF70 XR70

Vital Information
Part No TBW0931
Stock Level 8 Left

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


  • TBW0365 - Piston
  • TBW0206 - Gasket
  • TBW0156 - Cylinder 
  • TBW0125 - Carb
  • TBW0273 - Intake
  • TBW0301 - Throttle Cable
  • TBW0398 - Air Filter
  • TBW0189 - Camshaft
  • TBW0294 - Jet Kit

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We have all necessary support parts on hand.

Most orders ship same, or next business day, unless otherwise noted above.