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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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