Even at 12 volts battery cables and their connections are critical to good starting. Dirty connections make for poor starting. That voltage check at the starter terminal is a good test. Watch out for battery cables from the wallyworld battery kiosk that are good for a 1 litre nippon car, not a tractor engine. 2 gauge cables are about right at 12 volts, not 6 gauge.
Copper plug wires are important. And getting fuel past the oil pressure shut off (which often fails draining the gas tank into the crankcase) is a benefit.
Later new generation JD gas tractors ran a 6 volt coil with a dropping resistor and an auxiliary contact on the starter solenoid applies battery voltage direct to the coil for better starting.
An ordinary 12 auxiliary lighting cube relay ($3.95 at a car parts store) with its coil wired in parallel with the starter solenoid coil and its contacts wired to short the starting resistor will do the same thing for not much money beyond the 6 volt coil.
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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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