TBW0936 - $347.00
All Years CRF50 & XR50
All Years CRF70 & XR70
- High Volume oil pump ($25 savings)
- Clutch cover gasket ($3 savings)
- Performance CDI ($25 savings)
- Free shipping ($10 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:
- 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.
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).
TBW0365 - Piston Kit
Big bore kit
Very pleased with the kit it came with a messed up head once I sent them proof they immediately sent us another one and we delivered the other one back to them would highly recommend them any day
This kit was perfect! Had everything needed. Could be nice to have install instructions for the new guys but everything is on the internet.