Using a timing light is not a good way to check for spark. A good way is since it runs on the other cyls, pull the plug boot back on the problem cyl, fire up the engine, and carefully remove the wire from the plug and hold it a small distance from the head or block. See if it jumps a spark and report back to us on long of a gap it has when it can't jump any further. If it will jump good this way then it is time to look at the plug, then the cyl. Also if it will jump a spark this way, switch the plug with one from a good cyl.
It is possible the bushings in the distributor are worn enough that the points won't open enough on the one cyl. Seen this a few times on cars. If this is the case I would guess the plug wire for the problem cyl is on the same side the points are on. The constant side pressure of the points spring can wear the bushings
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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