Hi Mike,

Add to what you just said; overall size of all the ports, size of carb, restriction of muffler, and ignition timing, and you basically have the whole power output scheme of two strokes. You could measure everything and then see if someone could provide you with the specs for the other G23's to find out what the differences are. Most of these things could be modified excepting the transfer ports. They are very critical in their angles, and it is not recommended to try to change them.

Good luck,
AV8TOR