Whether you ride a stock Honda 50 or 70 or have a super tampered-with race pit bike, adding a CRF50 big bore kit will give you the power and torque you need. The big bore kits we offer are the best out there and will improve your performance dramatically. Typically they will double the horsepower you have to the ground and will turn a small slow engine into a fast one. The biggest reason people modify their pit bikes is to get more fun out of them. Its no fun to be the last one off the line and having a huge amount of low rpm torque will help level the playing field.

CRF50 Big Bore Kit: Installation Guide and Benefits

The kit is a complete cylinder head and carburetor kit that includes a big valve cylinder head, oversized piston, and a high performance cam. The kit will also include a manual clutch conversion which converts your stock semi auto clutch to a 3 plate manual clutch. The kit will also include all the needed case and cylinder gaskets as well as a 20mm carburetor jet set.

Once installed it is important to do a proper break-in on the new motor. This means starting the engine and while it warms up blip the throttle and vary the rpm’s, do this until the engine is at full operating temperature. This will ensure that the piston and rings have a good seal and will give you a smooth running motor.