Changing to a 12 volt system increases cranking voltage from 4.5 volts to 9 volts. I doubt it's "4X" the power as the guy told you. I've changed many old tractors to 12 volts and never had a single issue with the starter - left as-is. Oliver/Cleatrac HG, many Fords, Case VAC, Deere 420, Shaw R12, etc.
The only starters I've ever had any issue with increasing voltage was the crappy Delco direct-drive starters in GM cars. I put dual batteries in my SS Chevelle and it kept breaking starter drives from engaging too fast. That wasn't even a conversion. One battery cranked at 9.5 volts. Two big batteries in parallel had it cranking at 11 volts and that would break drives. Not built near as strong as the starters on most of these old tractors.
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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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