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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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