TBParts - Vintage Honda 88cc Race Head big bore Kit
All ATC 70

Vital Information
Part No TBW0939-ATC70
Stock Level In Stock

Same great quality CRF50/XR50 88cc kits now for Vintage

TB Race Head, 88cc Bore & 20mm Carb Kit
This is the Race Head 88 kit that everyone is talking about Performance and Price make Mike's Honda Trail Bike 88 w/ Race head a real winner Race

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).

Key Features:

  • Lightweight aluminum cylinder with steel sleeve
  • Cast in mounts on cylinder for aftermarket skid plates
  • Oversized cooling fins on cylinder for efficient heat dissipation
  • 52mm piston with rings, pin, & clips
  • High performance race camshaft for the race head
  • Larger valves (25mm intake & 22mm exh) and porting for increased performance.
  • Also has bigger cooling fins. includes all necessary parts. Comes disassembled.
  • 20mm Performance carb assembly.


  • High volume oil pump - TBW0225-6V
  • High speed 2mm drill bit - TRC-5526
  • 2 Size clutch tool - WHS-2274
  • TB oil cooler kit w/ intake mount - TBW9073
  • Sta-bil fuel stabilizer - W-57-1109
  • 12 Way rotating spacer - TBW0900
  • Pre-filter - WHS-1664

*NOTE: Throttle cable is for CR type twist throttles


  • ATC 70 - All years

Kit Includes:

  • TBW0219 - Piston
  • TBW0206 - Gasket
  • TBW0156 - Cylinder
  • TBW0125 - Carb
  • TBW0273 - Intake
  • TBW0301 - Throttle Cable
  • TBW0174 - Air Filter
  • TBW0189 - Race Cam
  • TBW0949 - Race Head & Valves Assembly
  • TBW0294 - Jet Kit
  • TBW0251 - Right Side Cover
  • TBW0861 - Cam Sprocket


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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