I converted several to 12 volts and always kept the old 6 volt starter and all worked okay. A 6 volt solenoid (electric/magnetic switch, if thats what you have versus a mechanical switch) can still work also but if it ever burns out due to too much current and heat simply replace it with a 12 volt.
NOTE 1 it is a bit tougher on starter drives (Bendix) but mine all did okay despite that. Myself and my friend Bob M suggest if you convert and keep the 6 volt starter use a standard or lighter duty 12 volt battery (or even lighter gauge cables) NOT a huge honkin 1000 or more CCA as thats even tougher on starter drives.
NOTE 2 I have heard instances when a tractor had a Magneto ignition that the 6/12 cranking speed was so fast the mags (they do change timing at X RPM ya know) were firing at the advance run timing (maybe 20 BTDC) versus the needed like 0 Degrees start/impulse timing and that causes obviious problems.
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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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