I bought this motor used in 2013. It started and ran fine for about 5 minutes; then it lost power and seemed to be running on only one piston, the lower one. I checked the plugs and the upper one was fouled, lower plug looked good. I was told by the person I bought it from, that it was the 2 cycle oil that I was using. He told me to switch to a synthetic oil, and it should be ok; that was the third time of bringing back the motor to be fixed! I didn't try the oil switch and decided to store the motor in my cellar. Any thoughts of what the problem might be? I would like get some use out of it.
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