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TBParts - 146cc Bore kit HC Piston
GPX Pitster YX Piranha

Vital Information
Part No TBW9066
Stock Level In Stock

TB GPX & YX 146cc Top End KIT

OD of cylinder skirt is 59mm

Meets or Exceeds OEM Specifications.

Key Features:

  • All aluminum cylinder with steel liner
  • High compression piston
  • Gasket kit included


  • Sta-bil fuel stabilizer - W-57-1109

This Kit is NOT for Stock Small valve heads
(Small valve GPX 124cc - Jialing 124cc ect)

ONLY for use with 23/27 Big Valve heads 
(Piranha YX140cc - Lifan 125/140cc) 

(With Proper Big Valve head)

  • Pitster Pro 125 
  • GPX 124cc 
  • THUMPSTAR 124cc
  • BRAND X MINI 125
  • UPC 125
  • EVOS 
  • KRP
  • OGM/YX 140 (not steel Cylinder lifan type) 
  • GPX 140
  • Pitster pro X2 or X4 140cc
  • Piranha 125 & 140 (not steel Cylinder lifan type)
  • Xtreme 124cc Typhoon

For use with Lifan 27/23mm Head , Piranha YX 140 27/23mm head or Other Big Valve heads

Kit Includes:

  • TBW0601 - Cylinder
  • TBW0424 - Gasket set
  • TBW0823 - Piston
  • TBW0862 - IF running TB V2 Head (gasket set)

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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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