Small drive sprocket 428 - 16: a drive sprocket for Alpha and Delta mopeds. The sprocket transmits rotation to or from the chain. The numbers in the name indicate the chain pitch and the number of teeth.
Replace the part if the teeth are worn ("hooked"), the chain is stretched, or there is runout. Replace the sprocket together with the chain. Designation 428-16: chain pitch 428, 16 teeth. Country: China. After installation, check operation at idle and on a short test ride.
