I have a 20 hp intec with 400 hrs. I had to adjust the valves once, no carb problems. Popping in the exhaust is common. Try leaving engine running at full speed before you turn it off. That seems to work better for me, eliminates dieseling and popping. When you turn key off, you kill the spark and unburned gas is inside the muffler. Popping isn't a sign you are running rich.
Check air filter, Check valve clearance Replace spark plugs Replace fuel filter I purchased a blown kohler engine off a cub cadet. There was only 300 hrs on engine. The cooling fins were 100% choked with dirt and grass. Engine overheating could be the cause of our problem.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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