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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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