After being unable to find the answer (because I was looking for it the wrong way) via searches, I asked the question at DIY Electric Car forums, and got my answer:
Quoted from that forum, the basic problem I'd face in the conversion would be this:
2 pole armature has the coil sides (wires in the steel slots) spaced approx 180 degrees. A 4 pole armature needs coils side spaces at approx 90 degrees. So a complete wire tear out and rewind is required. And then there are the magnets. You'd need to change to N-S-N-S instead of the N-S 2 pole arrangement.
I'd actually have to remove the magnets, physically cut them in half, etc., in addition to the total rewind of the motor. I'm not sure if I managed to do it I would find enough gain to be worth the effort. :-(
So the quest for easy power continues. :-)
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