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TBParts - 108cc Bore Kit w/ V2 Race Head and Stroker Crank for CT70 ATC70 XL70 SL70

Vital Information
Part No TBW9111
Stock Level 5 Left

This kit converts a stock 70 to 108cc and includes the Race Head V2. Also, includes a high volume oil pump and cam sprocket. For all 4 speed CT70H, SL70, and XL70. Also for 81 & up ATC70 and 3 speed 80-81 CT70.

Key Features:

  • Roller Rocker Arms exactly like the V2 head for the KLX110
  • 28.5mm intake Valve
  • 23.5mm Exhaust Valve
  • 5mm Valve Stem
  • 23mm Exhaust port
  • Matching High Compression Piston
  • Head kits include all hardware
  • 52mm piston with rings, pin, & clips.
  • 52mm Aluminum Cylinder
  • High performance race camshaft (for the Race Head only
  • Head gasket kit.
  • 51mm Stroker Crank.  Crank measures 57mm from gear to end.


  • 26mm Intake Port - Matches Intake Manifold Kit - TBW0433
  • High speed 2mm drill bit - TRC-5526
  • 2 Size clutch tool - WHS-2274
  • TBparts oil cooler for V2 heads - TBW9187
  • Sta-bil fuel stabilizer - W-57-1109
  • Pre-filter - OW-20-2159-01


  • CT70H - All years
  • SL70 - All years
  • XL70 - All years
  • ATC70 - 81 & Up
  • CT70 - 80-81
Kit Includes:

  • TBW0750 - Race Head
  • TBW0755 - Bolt Kit
  • TBW0752 - Camshaft V2
  • TBW0754 - Head Cover
  • TBW0753 - Piston
  • TBW0859 - Gasket Set
  • TBW0156 - Cylinder
  • TBW0287 - Gasket
  • TBW0334 - Gasket
  • TBW0622 - Stroker crank
  • TBW0861 - Cam sprocket
  • TBW0225 - Oil Pump
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).

See the Performance Info section for additional information on our performance parts.

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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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