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Re: piston question
First thing you should do is a compression test. This will tell you the condition of your rings and/or valves. If you test it and have low compression numbers, add a teaspoon of oil to the cylinder with low compression and test again. If the compression rises after that, you have worn rings.
One thing you can do (as a band aid) if you do not want to repair anything right now is run a hotter plug. That will help burn the oil off of the insulator and keep it from gumming up.
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