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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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