Define 'seem OK'.
Have you swapped #1 plug to another cylinder fed from the other coil?
Coils provide a lost spark to the non-compressed cylinder on their pair so it's unlikely to be a coil problem.
If you're 100% sure it's not the plug or cap (you have trimmed 1/2" off the plug wire and re-attached it to the cap, yes?) then suspect over-filled float bowl #1 carb. Likely cause would be failed float needle seat O-ring. That's a carbs oot job, of course, so hopefully it's plug/lead/cap related.
Hope you get it sorted quickly.