If the tractor is used hard so the temp gets and stays up plug fouling isnt so bad butttttttt light duty parade use and puttering around can lead to premature fouling. It can help if you use thermostat or air restriction to get n keep the temp up to 180 or more,,,,,,,,,,,dont run the carb any richer then necessary,,,,,,,,,use hotter plugs,,,,,,,,,have the ignition well tuned and use wire core versus carbon core suppressor plug wires.
Autolite 388 is hotter then 386 but the 3116 is a non resistor plug in the same heat range. Id opt for the 3116 if you prefer a non resistor plug but 388 otherwise. One old mechanic/farmer story is to use an extra plug washer to make the plug run a bit hotter. Of course Ive never did any scientific test to determine how, if any, effective that is, but if the plug seal is still good seems to me the plug would be a bit hotter whch may help burn off potential fouling deposits like oil or unburned fuel (carbon build up)....
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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