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Ken, a big difference in less plug fouling on the A or G versus 60 is that older single induction carb for both cylinders versus the dual induction on the 60. As explained above and due to that 0 180 then 540 coast cycle 2 cylinder firing, the left piston gets a better gas charge and does most of the work at idle. If the plugs foul and come out with that flat black colored sooty look you described, I agree thats excess unburned fuel from running too rich or long idle periods. Some things that can help, especially when idling, are to NOT run that carb (idle adjustment) any richer than necessary. HOWEVER, if youre gonna pull it then you have to have the carb (load needle) set sufficiently rich to avoid fuel starvation. Other things which can help reduce plug fouling are to use shutters or other air restrictions to get her up to 180 or higher degrees as soon as possible. Finally, you might try running a heat range or two hotter than specified for the tractor. If it has 18 mm plugs, maybe run Autolite 3116 (non resistor) or 388 versus the 386 specified which corresponds to the Champion D 21 (cooler)and D 23 (hotter) or the AC C 88L I believe. On the older 7/8 plugs I run the deep reach side wire electrode hot plugs like the Autolite 3077 or AC 18. If shes black sooting n fouling the plugs that quick, you must be idling her awful rich or the spark is weak, but you indicate its blue which usually means a good spark?? Theres no inlet air restrictions like in the air cleaner or mesh or piping is there??? The choke butterfly plate opens fully and stays open right??? If not she can be air starving n running over rich. Does she throw a lot of black smoke from the stack at idle??? I guess you have adjusted the carbs idle and load needles??? I set my idle initially at 1 3/4 to 2 out then at a slow idle lean them until she hesitates then open back up about 1/4. If not already you should be using wire core and NOT carbon core suppressor plug wires. If she throws a good visible BLUE spark (NOT a faint thin wimpy yellow) from the plug wires end to frame about 1/8 inch or more the spark seems okay. I also agree with the above, dont ever kill her by choking which deposits raw fuel on the plugs, kill it by turning the gas off n letting her die from lack of fuel is better. Have you done some extensive cam work?? maybe you have her set up rich for pulling so she loads up at idle?? SUMMARY: Try n get the temperature up quicker,,,,, ,,run hotter plugs,,,,, ,,,use wire core plug wires,,,,, ,,,dont idle her long periods and dont idle her too rich,,,,, ,,,insure theres no inlet air restrictions from a choke butterfly thats not staying full open or air cleaner or piping restrictions. If youre running high compressiosn and exotic fuels I suggest an electronic ignition and a high performance high energy coil, now that oughta really reduce plug fouling !!!!! !!!!! However, if shes not all that high compression, then you shouldnt be running very high octane gas which is purposely harder to ignite and may foul the plugs sooner and may cause more harm than good. If you have high compression then you need the higher octane gas and can produce more HP but NOT in a low compression engine do you wanna use it !!! Good Luck n God Bless John T
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