Honda 125cc Chain and Sprocket/Drive Set

A motorcycle’s chain and sprocket system transfers power from the gearbox to the rear wheel. The chain is a roller chain that runs over sprockets, which are metal discs with teeth around their circumference. The chain’s links mesh with the sprocket’s teeth to move the motorcycle.  Your front sprocket will rotate with the transmission output shaft, pulling on the drive chain, which in turn rotates the back sprocket, helping the back tire move.