TBParts - Roller Rocker Race Head V2 108cc Big Bore Kit
XR70 & CRF70

Vital Information
On Sale $594.99
Part No TBW9109-XR70-CRF70
Stock Level Check Stock

TB Roller Rocker Race Head V2 (52mm) Big bore & Stroker Crank kit 108cc
Highest Performance Race head on the market with full parts support in stock.

  • 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 


  • 26mm Intake port - TBW0433
  • 2 Size clutch tool - WHS-2274
  • High volume oil pump - TBW0226-12V OR TBW0225-6V (for 1981 or before)

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.

We recommend premium fuel and Sta-bil fuel treatment


  • XR70 - All years
  • CRF70 - All years 

Kit Includes:

  • TBW0750 V2 Race head
  • TBW0755 V2 Head bolt kit
  • TBW0752 Camshaft V2
  • TBW0754 Head cover set
  • TBW0753 Piston 52mm
  • TBW0859 Gasket Set 54mm
  • TBW0156 Cylinder
  • TBW0287 Gasket
  • TBW0334 Gasket
  • TBW0319 Crankshaft Stroker


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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