Wouldn't a vacuum gauge prove or disprove a leak? If you can eliminate that possibility and you've swapped carbs with the same result, I'd rule out carburetor problems. Anyway it sounds like we're all throwing darts so I'll throw a couple. First, yes you can check the timing with a light, you just need a 12 volt source to power the light. You may not learn much because the advance is beyond any marks anywhere. What you can learn is if the spark is occurring at the same time every time or if it's erratic. I've had similar problems with different machines and the solutions were all different. My 140 Farmall taught me to adjust valves one cylinder at a time. For some reason getting it on TDC and doing the valves that the IT manual says you can do, didn't work well for me. Since then, one cylinder at a time. If you could borrow a distributor from another tractor and wire that up, you could potentially eliminate spark and timing from the list of possible problems. You may have cracked cylinder head allowing one cylinders exhaust to interfere with the adjoining cylinder's intake. As mentioned before, an internal crack in the manifold will do the same thing.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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