For the ultimate in 88cc Honda CRF50 performance, anyone will tell you this is the big bore kit! Complete top end replacement including the Kitaco big valve head from the 108 and 117 kit. Includes everything you see in the picture and requires no engine case boring. This is the highest torque and horsepower 88cc engine kit , and the most power available without case boring. And only available at this price from Minimob Racing!