After reading other posts, I’m going with poor ignition. Allen has a good point about if there was no fuel, there would be nothing to explode in the exhaust. The other main reason is that you say it will only start after the starter disengages (which reduces a large electrical drain on the battery and allows the voltage to increase going to the coil. The other posts refer to this sounding like what happens when you switch the ignition off and then turning it back on. I would start with the coil, (guessing you don’t have a magneto) and check to see how the spark is right out of the coil. Should be nice and blue and jump at least a 1/2 inch to a good ground. If not, as other posts suggest change the condenser and points. If it has good spark at the coil check it at the plugs. Spark should still be blue, and jump about ½ an inch. If not, take a good look at the rotor, cap and spark plug wires. If this is tractor has been converted to 12 Volts, I would suspect the resistor is getting bad, and would suggest replacing it. As a side note, on my conversions, I run a wire from the starter button to the coil side of the resistor so that I get a 12 Volt start 6 Volt run system. Makes those old 6 Volt coils punch a spark and start good in the cold winters up here in SD.
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