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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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