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TB Parts

114cc Bore Kit, Race Head, & 20mm Carb Kit – TRX90 All Models

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  • $ 474.95


 114cc bore kit, Race Head, & 20mm carb kit – TRX90 All Models

TB Parts 114cc big bore kit, V1 Race head, and 20mm carb for use with stock air box.

Starting with the V1 cylinder head’s larger 25/22mm stainless steel (21-4N) valves, better porting, larger cam, improved valve geometry and superior quality this new setup will rev quicker, farther, and make much more power than the stock setup. Add the lightweight high compression 54mm bore kit that brings up the bore to 114cc and makes for a stronger power band. Finish it off with our 20mm performance carb adding up to a high level of performance at an affordable price! These kits can can make as much power as the larger 125cc Chinese engines. These are high quality parts and require no machining to the cases or other modifications – bolt on and go! There are no installation instructions, but if you can replace your piston, you can install this kit. If you don’t have any experience working on your engine, we highly recommend having a professional technician install this kit or, at a minimum, purchasing the shop manual.

Key Features:

  • Race Head V1 – 25/22mm Stainless (21-4n) Valve, 21mm intake port, oversized exhaust port, & improved valve geometry (valve, seals, and springs installed).
  • Race Camshaft
  • 54mm Aluminum Steel Sleeve Cylinder
  • 54mm High Compression Light Weight Piston Kit (91+ octane pump fuel friendly)
  • 54mm/114cc Top End Gasket Kit, Clutch Cover Gasket, & Center Case Gasket
  • 20mm performance carburetor with cable for use with OEM air box and manifold.
  • No case boring
  • We stock all the replacement parts for this kit, no ridiculous wait times or prices for these High Performance spares.


  • You will need one of these to adapt the carburetor to the OEM Manifold – 20-24mm carb adaptor and gasket (2 pcs)
  • Works with Electric start and Pull start models.

Kit Contents by Part Number:
TBW0318, TBW0721, TBW0788, TBW0857, TBW0133, TBW0376, TBW0125, TBW0294, TBW0798, TBW0385, TBW0300