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TB Parts

88cc Big Bore Race Head Kit w/ Carb Kit - Honda Z50, XR50/CRF50 XR70/CRF70 CT70 TBW0936

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  • $ 394.99
2 reviews


Race Head, 88cc Big Bore kit, and 20mm Carburetor Performance Kit:
TBW0936 - $347.00

All Years CRF50 & XR50
All Years CRF70 & XR70
88-99 Z50
91-94 CT70

UPDATE - Until further notice, this kit will also include the following items at no extra charge and free shipping!!!

- 6 Piece main jet kit for the 20mm carb ($10 savings)
- High Volume oil pump ($25 savings)
- Clutch cover gasket ($3 savings)
- Performance CDI ($25 savings)
- Free shipping ($10 savings)
$73 total savings

TB Race Head has been updated for even more performance!  It now has 25/22mm valves with better porting/flow.  We also kept the combustion chamber the same size and changed the angle of the valves slightly. This will really wake up your stock engine and is comparable in power to the much larger Chinese 124cc engines!!!

Includes the following:
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 high compression piston with rings, pin, & clips
- Head gasket kit and clutch cover gasket.
- High performance race camshaft (for the Race Head only)
- Race Head – Larger valves (now 25/22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled! The exhaust valve has been upgraded to stainless steel (21-4N material) .
- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware/wrench, long adjustable throttle cable (does not work with stock throttle), and a angled dual layer foam air filter.
Installation Note:
DOES NOT WORK WITH STOCK THROTTLE! It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).

Replacement Parts:

TBW0365 - Piston Kit
TBW0206 - Gasket Kit
TBW0156 - Cylinder
TBW0125 - 20mm Carb
TBW0273 - Intake Manifold Kit
TBW0301 - Throttle Cable
TBW0398 - Air Filter
TBW0300 - Race Cam
TBW0949 - Race Head & Valves Assembly
TBW0226 - Oil Pump
TBW0262 - CDI 
TBW0294 - Jet Kit
TBW0287 - Gasket