Fast Freddy, pull the head off and raise the cylinder off the piston. Take the ring off the piston and place it in the cylinder above the exhaust port. Hold the cylinder up to the light and see if you can see light around any part of the ring. This is called the light test. I bet the cylinder was honed out of round. Know anyone who can check the cylinder with a inside mic for roundness for you? The ring is free on the piston land also?