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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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