8 Volts is kind of a band-aide fix. Unless you reset the voltage regulator to just under 10 Volts, the 8 Volt battery will not be fully charged. If you do set up the voltage, it's a good idea to add a bit of resistance to the power lead to the coil primary, or it will be hard on the points and coil. If you're going to do all that, it's just as well to go all the way, and convert to 12 Volts to use a more common battery, and make the tractor standard with other equipment for boost-starting or running any modern accessories. If you are not ready to modernize to 12 Volts, the 6 Volt system can be tuned up by cleaning ALL battery, starter, and ground connections, and being sure you have the HEAVY gauge battery cables necessary with a 6 Volt system. Be sure the 6 Volt generator is bringing the batery up to about 7.4 Volts, and have the starter checked over by a reliable local outfit that's familiar with the 6 Volts stuff. Run oil in the engine that's appropriate for the seasonal temperature.
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