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 - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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