Trail Bikes 108cc Stroker Kit 3 with Race Head for CRF50 Finishing Touches Great for 88cc or larger

Great for 88cc or larger displacement engines or simply use as a replacement for the stock clutch when it wears out

Piranha 140cc Pit Bike Engine

Race Head V2 Intake Kit

Race Head with Large 25/22mm valves and porting for increased performance and big cooling fins

we recommend the following:

Trail Bikes 108cc Stroker Kit 3 with Race Head for CRF50 Finishing Touches Great for 88cc or largerThis kit is the complete kit to convert your stock motor into a powerful open class 108cc engine (much more powerful than the common Chinese 107 and 125cc engines). Also this crank was made specifically for the newer engines and thus you will not have any fitment issues like trimming the piston skirts in order to clear the crank or the piston not lining up with the cylinder deck. 51mm Crankshaft with NTN bearings High compression piston with rings,