As it's running, pull the spark plug wires one by one and replace them one by one. The engine will change when you pull a wire that's working(meaning you're getting spark and cutting the spark disables cylinder). When you pull a wire and the engine DOESN'T(meaning you weren't getting spark anyway) change, that's the cylinder you need to scrutinize. That's the first thing I do when an engine is running poorly; isolate the problem. If NOTHING changes when you pull ANY of the plug wires, it could be in the valve train (valve stuck open) or in the carburetor (gummed up with old gas) Good luck and report back with any results or more questions.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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