TB Race Head, 88cc Big Bore Kit & 20mm Carb Kit – Z50R, XR50, XR70 and Other Models
This complete 88cc Race Head Kit will really wake up your stock engine and is comparable in power to the much larger Chinese 124cc engines!!! They are extremely reliable as well! This kit works on the following models:
- 88 thru present Z50R, XR50, and CRF50
- All XR70 and CRF70
(Note: For the 88-91 Z50R, the newer style 2 bolt cam sprocket will be needed. We have them available in this section and the part number is TBW0861)
This kit includes the following items:
UPDATE – Until further notice, this kit will also include the following items at no extra charge!!!
- 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)
$63 total savings
- 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 with larger 25/22mm stainless steel (21-4N material) valves for better flow and increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled!
- 20mm Performance carb assembly. Includes: 20mm carb, port matched intake, heatstop, gaskets, mounting hardware/wrench, long adjustable throttle cable, and an angled dual layer foam air filter.
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).