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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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