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No spark: Remove both spark plug wires & using a meter set on 10K ohms scale put either meter lead on each plug wire & see what the resistance is. If your motor was run with a plug wire off it may have damaged the coil. Should read about 8 to 10 K resistance. If it is infinate it’s bad, The secondary winding has two ends to the winding & both are spark plug wires. One fires when the coil fires & the coil has enough electrical energy still & “sees” the first plug going to ground thru the plug gap, the resistance now goes down & fires the other spark plug in a mirco second. If you have around 10K residtance, your coil is more than likely good.
Good luck