As other said, 8 volt is a band aid. Unless the regulator is adjusted, it will not charge properly. Try and fix whatever is wrong so it starts and charges properly on 6 volts. Make sure all the high current cables are proper and have not been changed out for smaller gauge 12 volt cables. The starter might have issues, needs a rebuild?, that are hidden when cranked from 12 volts, but even after a conversion, they will reappear. If it seems to spin fast enough, check the coil. It might be the wrong one (12v with internal ballast) or simply weak.
I don"t understand the desire to convert all these old machines to 12 volts. As with anything, when properly maintained, it will work as good as new without modifications. I drive a 6 volt car on a daily basis, year round, with no problems at all. Lights, radio, heater, gauges, they all work properly.
Just needs a little troubleshooting and minor repair would be my guess.
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