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Assuming your problem is oil fouling, I will tell you something that has worked for me. Get the tractor running the best you can, get it warmed up and shut it off. Take off the air tube from the air cleaner at the carb. Start the engine and set it at a very fast idle. Spray Liquid Wrench or WD40 aerosol (or any good penetrating oil) into the air intake of the carb as fast as you can without stalling the tractor. Spray the whole can through and when you are about out of penetrating oil, spray more quickly, so it stalls the engine. Shut off the key and do an oil change and again clean the spark plugs. Put the air cleaner tube back on the carb and start the tractor. Trying this procedure, which only costs a few dollars, may remove deposits that are causing your rings to stick and also remove combustion chamber deposits. I might warn you that it puts up quite a smoke screen though, so warn your neighbors so they don't call the fire department! Another thought: do you have the right weight oil in your air cleaner? In my engines that have fouled plugs, usually it is just 1 or 2 cylinders with a problem. If all the plugs are oil fouling fairly equally, I would suspect that your engine is getting a lot of oil from one source. I don't know if it is possible for that source to be the air cleaner, but it might be worth a try removing all the oil from the air cleaner and running the tractor a while, under clean conditions, to see if it cured the problem. Or if your plug fouling is caused by fuel, like Tony suggested, you have carb problems. I would look at examples of fouled plugs that are pictured in some of the old motor manuals to get a better idea of what the problem is. Could your carb be set way too rich? Good luck, hope it works out OK.
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