Many vintage 6 volt tractors have only a cutout on the generator (usually round can) and a third brush to regulate the current. They are more variable voltage, but WILL overcharge the battery on a long run unless the operator turns on the lights to absorb the extra current from the generator when the battery has had time enough to be fully charged. That manual control of charging probably means a new battery each year if not more often.
In my opinion applying 8 volts to a starter that didn't crank good with 6 volts is kicking a dead horse. As noted below, worn bearings, worn brushes, wimpy (ala walmart battery kiosk) battery cables, and dirty battery circuit connections will keep a starter from working well at 6 volts, but applying 8 or 12 volts will only finish the destruction of the starter more rapidly.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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