These front sprockets are used on the Chinese 50cc – 125cc engines. These sprockets are compatible with #420 chain only.
Sprocket Details:
#420 Chain Size
Usually used on ATV’s with a 7″ rear wheel or smaller
Choice of 12, 13, 14, 15, or 17 Tooth
Fits 17mm shaft
Requires a retainer to function properly. (Part Number: ZN61241-SR387-02)
Will NOT fit Kazuma ATV’s (90cc and under use #428 chain)
May come with 2 or 4 bolt holes. (see 2nd image)
Be sure to measure your chain or current sprocket before ordering. 420 chain has a 1/2″ pitch and a 5/16″ roller diameter. Most Chinese sprockets have the chain size and tooth count stamped into the metal.