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) - High volume oil pump included - 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.