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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want � unless you own a monster tractor. U
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