88cc Big Bore Kit with Race Head - Honda Z50, CRF50, XR70 & CRF70

50 Caliber Racing 88cc Big Bore Kit with Race Head for Honda CRF50, XR50, CRF70 & XR70 Pit Bikes

88cc Race head kit for your Honda 50 or Honda 70. This kit will drastically improve your overall performance on your bike. A stock Honda 50 puts around 2.2 hp to the ground and this kit will put you between 5.5-6 hp to the ground and 30% more to the crank! Kit comes with fully assembled race head, performance cam, 20mm carburetor, and all the other goodies needed to fulfill your need for speed!

Specifications:
- Comes with fully assembled race head (with larger valves for significantly increased air flow)
- Performance CDI box included that removes stock rev limiter
- 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
- Head gasket kit
- High performance race camshaft
- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting
hardware/wrench and air filter
- Extended throttle cable (to fit aftermarket hand throttle)

* High volume oil pump recommended, but not included

Fits the following Honda pit bikes:

- CRF50F (2004-2022)
- CRF70F (2004-2012)
- XR50R (2000-2004)
- XR70R (1997-2004)
- Z50R (1988-1999)

We have been selling these kits since 2004 and believe they are of the highest quality and put out the most power you are going to find in a Big Bore kit period.