TBParts - Roller Rocker Race Head V2 108cc Big Bore w/ Mikuni VM26 Kit
XR70 & CRF70

Vital Information
On Sale $730.15
Part No TBW9118-XR/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)
  • VM26 Mikuni Carb Kit 
  • Head gasket kit.
  • 51mm Stroker Crank 

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


  • High volume oil pump - TBW0226-12V
  • 2 Size clutch tool - WHS-2274
  • 2mm High speed drill bit - TRC-5526
  • 26mm Intake - TBW0433
  • TB oil cooler kit w/intake mount - TBW9073
  • TB 12 way rotating 26mm - TBW1020
  • Sta-bil fuel stabilizer - W-57-1109

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.


  • CRF70, XR70 1988-Present

 Kit Includes:

  • TBW0750 - V2 Race head
  • TBW0755 - V2 Head bolt kit
  • TBW0752 - V2 Cam
  • TBW0754 - V2 Head cover set
  • TBW0753 - Piston
  • TBW0859 - Head gasket kit
  • TBW0156 - Cylinder
  • TBW0301 - Throttle cable
  • TBW0433 - Intake kit
  • TBW0399 - VM26 Carb
  • TBW0413 - Air filter
  • TBW0287 - Clutch cover gasket
  • TBW0334 - Center case gasket
  • TBW0319 - Stroker crank


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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