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TB 146cc Bore kit and YX 140 Big Valve Head Kit

Vital Information
Part No TBW9066-0492
Stock Level 2 Left

TB 146cc Bore kit with HC Piston
YX 140 Big Valve Head
32T Cam sprocket 

OD of cylinder skirt is 59mm


  • GPX 125cc 
  • Pitster 125cc
  • Piranha 140cc 

Kit Includes:

  • TBW0601 - Aluminum cylinder 57mm (78mm tall)
  • TBW0424 - Head and base gaskets
  • TBW0823 - 57mm TB piston with 13mm pin 
  • TRC-0492 - head

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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.