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 - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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