I installed one of those ignitors on a 4010. Not sure if a late model 4020 gas is similar. A 4010 used a 6 volt coil and was 12 volt positive ground. There is a resistor on the ignition switch that drops the voltage to the coil to around 6 volts when the key is in the run position. When the key is in the start position this resistor is bypassed and 12 volts is at the 6 volt coil to make a hotter spark while cranking. Easier starting was the idea behind this. I removed the resistor and used a bolt for a jumper so there is 12 volts at the coil when cranking and running. Also used a 12 volt coil. This may be why yours dies when the key is released to the run position if you changed the coil to a 12 volt. There are others on here that know a lot more than I do but this may get you headed in the right direction. Also that was the best improvement I've made on that tractor besides switching to a Zenith carb. You won't be disappointed after you get it lined out. Be sure and check the timing also.
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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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