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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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