Re: Blue wire to black wire nightmare
Misfiring appears to be a symptom of bad timing. Flipping the magnet will provide correct polarity of the pulses but timing will be off.
Be aware the coil can be flipped too but plates will be distorted if you tighten it down due to one side of coil being fatter than the other.
So you have 2 coils, 2 magnets, 2 orientations of the magnet, and 2 ways to connect wires. That's 16 combinations to try. If none work then it must be something else besides ignition. Were the two engines identical or from different vendors?