I am going to address the last portion of your post. If the distributor shaft is worn in the bushings where the shaft comes through, or is bent, or has some of the cam lobes worn down, it will run on only one cylinder, (or none, or all of them erratically). With the rotor removed, Try to wiggle te shaft toward the engine and away from it, Up and down, and diagonally. If you detect any movement you can feel or see easily, it is time for a rebuilt distributor, or to have bushings put in yours. The tolerance is at or less than .001". Worn bushings allow radical timing changes and dwell changes than can prevent spark to some plugs. I give it a 90% chance of being the issue. Setting the point gap at like .030 might get some more cylinders operating, but that is not going to fix it, just a possible check. Putting the distributor on a Sun Distributor machine will tell the story. If the bushing is bad no other help will be effective. Jim
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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