WAI DST3890 Distributor (And Other Chinese Variants)

Bewy said
If you switch the wires, timing will be very advanced & rotor position with respect to cap segments will be out, might cause cross firing in the cap.
Pick up polarity is designed to trigger as the trailing edge of the reluctor tip passes by the pole. Switching wires has it triggering on the leading edge.
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That is exactly what I was saying, there is a coil for SB and one for BB because of the direction of rotation. You can't switch them out but if you have a BB coil in a SB dist you can switch the wires and It will work.