I just put a 125m motor in an 85 70 chassis. I did a lot of research on here before doing it and everything I read said I could run a 428 chain with the 420 rear sprocket. That is absolutely not the case. I bought a new chain from parts unlimitted and have tried it with three different atc70 rear sprockets and it will not work.
Can anyone tell me if I can get a 428 rear sprocket that fits the atc70?