I agree with the Rusty Man. If it takes the modern (to me at least lol) 18mm plugs the Auotolite 386 is near the original factory heat range I believe, while the 388 is a tad hotter AND I WOULDNT MESS WITH ANY ADAPTERS. If its a Magneto Id consider the Autolite 3116 NON Resistor plug instead. Things that can help reduce plug fouling (esp in a parade light use tractor) are to keep the temp up to 180 and more,,,,,,,dont run the carb any richer then necessary,,,,,,,,,use a hotter plug,,,,,,,keep ignition well tuned with good points n condensor and wire core plug wires......
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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