Even with a new plug gapped to specs, engine starts missing in about 30 minutes and then under normal load shortly loses almost all power. When I clean the deposits, the same thing happens in about 30 minutes. A possible sympton is that after starting cold, there is a small amount of smoke that starts in just a few minutes then stops after about 2 to 3 minutes. There are no signs of oil dripping on the exhaust. I use middle grade gasoline and Kohler oil. The problem only started after a full season of running fine. Your help will be most appreciated.
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