Camshaft sprocket for Viper 125-200 cc motorcycles and similar (China, Minsk). The camshaft sprocket is linked to the crankshaft by the timing chain and sets the valve timing: the valves open strictly at the right moment of the stroke.
Worn teeth or cracks cause noise from under the valve cover, timing errors, loss of power and hard starting. The sprocket is usually replaced together with the timing chain and the tensioner.
