Starter Motor for 50cc-125cc ATV,Dirt Bike,Go Kart,Pit Bike,Four Wheeler,Quad Bikes fits for 50cc-125cc Above Hotizontal Engine 12 teeth Starter Motor The installation pitch-row(A-B): 72.73mm The installation pitch-row(B-C): 64.84mm The installation pitch-row(A-C): 64.08mm