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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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