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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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