CB1100 Idle speed instability problem

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Here's your stepper motor diagram Speed;



See what happens when you connect a 9v battery across the scope probes and then connect it in reverse, the trace reverts to the centerline instead of remaining in the positive section and the scope makes you think there is a 24v signal, which is why Lord popgun asked you:"how exactly have you connected the probe" meaning: pulses with respect to what? ground or the other side of the coil?.

The windings are reversed because if you reverse the magnetic field you also push the rotor and pull with the other coil.

The use of "the force" is then greater which explains perfectly why we have rlets on our bikes