Or, in this case, a ring. I just bought a bike with a:
64cc Polini Reed Valve Bore Kit
15mm Bing Carb
Perf. Air Filter
It was not running when I bought it and the previous owner thought that it needed new rings. I took off the head and the ring is intact and in one piece. So, how do I know if I need a new one? It is kind of loose on the cylinder but if I squeeze the open ends together it makes a pretty good fit with a very small gap between the two ends of the ring. The cylinder has some black stuff on it from where a little of the combustion chamber action has slipped through this hole. Thanks in advance.