Others have identified the cause being that the starter is drawing down the battery supply so there is low voltage at the coil.
Weak battery or bad connections can be the cause.
One other possibility. Is this 6 or 12 volt system. I've seen a couple of tractors with 12 volt conversion kits give the same problem. The reason was that the supplied resistor for the coil was too high resistance. Should be 1.5 to 2 ohms, on one of mine it was 5+ ohms.
On mine I replaced the 6 volt coil with NAPA IC14SB -12 volt no resistor required- and eliminated the resistor. That cured the problem.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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