If it is in fact running that rich you have a problem and that rich could be causing wash down in the cylinders which is as bad as running to lean or even worse. I would take the main jet and screw it all the way in, then back it out about 4 turns. Adjust for max. power with no black smoke and fine tune it from there to the point you have good looking plugs and good power. Running the rich is probably hurting your engine because the extra gas is washing the oil off the cylinders and hurting the rings and pistons
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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