I agree with Goose, what you are hearing is probably air sucking into the gas tank. Possibly the vent in the cap is blocked with ice if it was below freezing.
Or it could be a vacuum leak, but that should be constant, not happen after running 20 minutes.
As for the starter, most leave the 6v starter on. If you are careful not to crank on it too long, the starter windings will handle 12v just fine.
But... Some tractors handle the hard hitting 6v starter better than others. The problems can be broken drive gear, damaged flywheel gear, broken starter housings, etc., while others seem to have no problems at all. Depends on the design, how hard the engine starts, and how often it is started. Something that may lessen the damage is to use a low CCA battery.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil�s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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