1
All Pit bikes have a copy of the Honda CT110 Monkey bike engine that Honda introduced in the 1950's.The Chinese took this technology and purchased the patent to the motor. Basically the 125cc is a supped up version of the Honda CT110. In there knowledge they utilized the identical motor casings and motor barrel honed it out to suit  54mm piston and lengthen the stroke.125cc Engines are now ste