The design of the starter. If by chance it was over engineered, everything extra heavy duty, you may get by with running 6v on 12v. Look around this site, ask your rebuilder, see what problems, or not, others have had with your particular model.
The other consideration is how often do you use the tractor? If it's a working tractor, used and started a lot. If it costs you money and scheduling problems when its down, I would consider converting it to 12v. If its a show tractor, mostly sits and looks pretty, leave it 6v.
You most likely won't burn up the 6v starter. The problems range from broken housings, broken drive gears, and damaged ring gears. It's the hard slamming of the drive into the ring gear that causes problems.
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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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