Dirt or varnish in fuel filter or carburator. Change filter if there is one. Flush out the carb with a varnish remover. Open high speed needle valve 1/8 turn farther, then turn in while running until it just smooths out.
Clean the muffler. Also check the head gasket. I replaced mine and cleaned muffler and it works well now.
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Dirt or varnish in fuel filter or carburator. Change filter if there is one.
Flush out the carb with a varnish remover.
Open high speed needle valve 1/8 turn farther, then turn in while running until it just smooths out.
Clean the muffler. Also check the head gasket. I replaced mine and cleaned muffler and it works well now.