What size battery cables are on it? They need to be 00 size if you're staying with 6 or 8 volt system. Every connection must be clean and tight. Also check the starter solenoid or mechanical switch, which ever it has. If it's heating up, it has high resistance.
Have you opened up the starter and checked the bushings? If the bushings are worn, the armature will drag on the field windings causing the starter to draw too many amps, robing the coil of enough voltage to fire.
If it's a mag ignition, might take a look at it, be sure the impulse is working, coil is good, etc.
If you're set on going with 8 volts, be sure to adjust the regulator up to about 9 volts, otherwise you'll have an 8 volt battery undercharged to 6 volts.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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