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 - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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