Light bulbs will be brighter but won't last nearly as long. Points may also burn a little faster but probably aren't a big deal unless you're using the tractor every day.
If you have an actual voltage regulator it'll have to be adjusted to charge an 8 volt battery. If you have a cutout relay, it'll charge an 8 volt battery, just not as fast as a 6 volt one. A 6 volt regulator will limit generator output to about 7.2 - 7.5 volts, not enough to charge an 8 volt battery.
A cutout relay simply disconnects the battery from the generator when its not running, but doesn't limit the output voltage of the generator.
Generally, an 8 volt battery is an attempt at a quick & dirty patch job instead of fixing the actual problem. You don't say why you want to change, so we can't offer any suggestions to make sure the existing 6 volt system works the way it should.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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