The compression is good, surprisingly good for the age of the engine. New rings made a difference, I just replaced them because I broke one of them and didn't want to shell out for a piston. I can tell the compression is good because of the effort it takes to pedal. It is the same hot or cold. The problems on this moped so far have never been gas, only spark. It's pretty obvious that the ignition is erratic when I test with a brand new plug and it gives a weak spark, perfect spark or no spark at all and I never know why. I'm just going to try to replace ignition parts one by one until I fix it. A loose flywheel might have to do with it. I did tighten that nut pretty hard though, just the pin inside isn't perfectly stiff anymore.
Re: sparking problem
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