The item "Small drive sprocket 420 - 13" is 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.
Replacement is needed if the teeth are worn ("hooked"), the chain is stretched, or there is runout. Replace the sprocket together with the chain. Designation 420-13: chain pitch 420, 13 teeth. Country: China. After installation, check operation at idle and on a short test ride. If you are not sure the part will fit, call the workshop and we will help you choose.
