This could also be due to excess resistance in the coil circuit.
I bought an 8N Ford that acted the same way. It had a 12 volt alternator conversion kit.
Whoever did the conversion used a direct 12 volt coil (no resistor required) but did install the resistor and the resistor measured 5.5 ohms rather than the 1.5 to 2 ohms that it should be.
I removed the resistor and it started and runs like it should.
Check to be sure you have either a 6 volt coil(1.5 ohms across small posts) and a near 1.5 ohm resistor, OR a direct 12 volt coil (3 ohms across small terminals) and no added resistor.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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