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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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