My chain on my 1980 Minarelli powered AMF Roadmaster (with 80cc Polini kit) broke today while cruising at about 35 mph. I bought a master link but checked the drive sprocket before putting it on. There is a "v" crack between two teeth. I don't know if the chain broke the sprocket or if the sprocket precipitated the chain breaking but now am wondering which way I should go.
Should I order the stock 10 tooth or go up to the maximum of 12? Or will that cause too much stress on everything and I am setting myself up for another failure? Should I go down to a 9 or will that cause more stress and the 12 would be less stress? Not sure which way to go.
With the 10 tooth, there is some slowing on hills and some strain on the engine but nothing too much. I am sure if I gave more throttle there wouldn't be too much effect but I haven't been pushing it on hills while breaking in the new cylinder.
Thoughts anyone? What about the chain, should I be looking at a new one along with the sprockets? It is 32 years old but it only has 300 miles on it (I?ought the bike with 179 miles on it).