It all depends on how well built the 6 volt starter is. Some work fine on 12 volts. A blanket statement saying they all will suffer is nonsense.
I've had a Deere 420, two Oliver HGs, two Case VACs, a Ford 641, and a Ferguson TO35 that have been using 12 volt batteries for 30 years now with no starter failures. Same for a Shaw tractor I have with a Wisconsin engine and Prestolite starter.
On the other hand - I put TOO much battery in a car with a 12 volt starter and two huge 12 volt batteries (in parallel). 327 V8 in my 1964 Chevelle SS. Direct-drive Delco starter. With one battery and cranking voltage at 9 volts it held up OK but was slow at times. Since I was getting big tractor batteries for free - I installed two. That brought cranking voltage up to 10.5-11 volts and starting breaking starter drives.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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