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TBParts - Vintage Honda 108cc Stroker big bore & 24mm Carb kit
CT70 ALL 4 speed & 80-81 3 speed

Vital Information
Part No TBW9093-CT70ALL4speed&80-81
Stock Level Out of Stock!
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108cc Stroker Crank with Race Head Kit w/TB 24mm carb kit

We recommend purchasing the Upgrade Disk Kit for your TB manual clutch. Additionally, we do not recommend the use of an inner rotor kit with this clutch (on a 108cc or larger engine) as it can lead to premature clutch failure due to extra fatigue placed on the clutch housing. However, we offer an upgrade which allows use of inner rotor kits and larger displacement engines

Please see the Billet Housing upgrade available in this section for more details. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on!

This kit is the complete kit to convert your stock motor into a powerful open class 108cc engine. Also, this crank was made specifically for the newer engines and thus, you will not have any fitment issues like trimming the piston skirts in order to clear the crank or the piston not lining up with the cylinder deck.

This kit requires engine dis assembly and therefore, we highly recommend a professional technician install this kit. If you plan on doing it yourself, you will need to have a Clymer or Honda shop manual. Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft.

Race Head has been updated for even more performance! It now has 25/22mm valves with better porting/flow. We also kept the combustion chamber the same size and changed the angle of the valves slightly.

Key Features:

  • 51mm Crankshaft with NTN bearings
  • High compression piston with rings, pin, & clips
  • Race Head Larger valves (now 25/22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled!
  • Lightweight aluminum cylinder with steel sleeve, cast in mounts for skid plates, and larger cooling fins.
  • High performance race camshaft 
  • TB24 Carburetor kit with intake, air filter, and throttle cable. 
  • Crankcase and clutch cover gaskets
  • Head gasket kit
You should also have the following parts:
- Oil Cooler
- Billet Clutch hub


  • ALL 4 speed CT70H , SL70 & XL70
  • 81-85 ATC70
  • 3 speed 80-81 CT70

Kit Includes: 

  • TBW0713 - Crank
  • TBW0365 - Piston Kit
  • TBW0225 - High Volume Oil Pump
  • TBW0287 - Gasket
  • TBW0334 - Gasket
  • TBW0206 - Gasket Set
  • TBW0273 - Intake Kit
  • TBW0301 - Throttle Cable
  • TBW0230 - Carburetor 
  • TBW0174 - Air Filter 
  • TBW0327 - Jet Kit
  • TBW0949 - Race Head & Valves Assembly 
  • TBW0251 - Right Side Cover for Race Head
  • TBW0189 - Race Cam
  • TBW0156 - Cylinder
  • TBW0861 - Cam Sprocket and Dowel

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Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online Pit Bike Technical Info Database!

We have all necessary support parts on hand.

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


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