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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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