When you say you moved the plug wires one space and it still run to me says you have a timing issue. That tells me the rotor in the cap is pointing nearly half way between the spark terminals to the plug wire towers of the distributor cap. I would guess that it is way advanced. Another thing that might explain why it runs okay for 10 - 15 minutes may be a sticking centrifugal advance, but is some how loosening up when the engine warms up. This allows additional advance to cause it to run poorly. I’m surprised you are not getting spark detonation when this happens but those old tractors have a really low compression ratio. Just my theory.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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