This past weekend my farther in-law and I attempted to get his 1977 Puch Newport back on the road. It has been off the road for about 3-4 years. We drained what little gas was still in the tank (maybe 2-3 cups). Filled it up with new gas, 2 stroke oil, and lead substitute. Cleaned out the intake, and it started right up. So for the rest of the day we all took turns riding it around.
In the afternoon after one of the longer rides (30 min) the moped sat for about an hour, and when we went to start it back up the cylinder was locked up. I eventually got it unlocked, by holding the starting lever and pulling down and back on the bike till it finally moved the piston. we went on a few short test rides seemed fine. It then sat over night and was frozen again. I don;t want to do any more damage to the bike till we find out what is causing this and how we can prevent it. Any Ideas?
Thanks a ton.