Inside carb is not going to be that easy to get to for any of the adjustments. Too bad they did not have a true right/left setup with carb adjustments facing out.The wire deal is just to get the idle screws in exactly the same spot as the starting point. Adjust the throttle cables so the arm on each carb begins to rise at exactly the same time when you twist the throttle. It will never idle that way, though - you have to turn each screw in an equal amount from that point to get an acceptable idle before tuning the idle mixture.
Any insight into wiring, particularly what is needed to just get it running, headlight-less?