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Joe, We have beat this topic to death over the years lol. Heres the deal, although its true Autolite 388 are hotter then 386 they are both resistor plugs so try maybe an Autolite 3116 which is in that heat range but NOT a resistor plug. Duane Larson "The Spark Plug Guru" has recommendations for some of the old original plugs, try what he recommends ..... .... Next youre correct in that keeping the temp up in the 175 to 195 range can help reduce plug fouling so play with the shutters and/or other air restrictions. In light use to help reduce plug fouling you dont wanna run the carb any richer then necessary and you sure dont want a lot of excess black smoke out the stack so adjust n lean the carb as necessary if rich running is a problem. You dont wanna waste any limited spark energy as heat so use wire core and NOT carbon core suppressor plug wires. Dont run any harder to ignite controlled slower burn higher octane gas then necessary cuz it could leave excess unburned fuel deposits (i.e. fouling) on the plug. 87 octane is fine in these old very low compression tractors Theres arguments over plug brands but in my opinion that listed above is more important then what brand of plug you use so use the hottest non resistor plug regardless of brand,,,,, ,,keep temp up to over 180,,,,, avoid long idle periods,,,,run a leaner carb,,,,use wire core plug wires,,,,, ,KEEP THE IGNITION TUNED NEAR PERFECT FOR A BRIGHT BLUE HOT SPARK..... .. A WEAK SPARK CAN CAUSE QUICKER PLUG FOULING John T
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