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 - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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