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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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