not really understanding your question, but http://boxermetal.com/ he is located in chico, CA. He sure knows his stuff on airheads of all years, i don't know if he is on here but he might be. Also AVSrider forum has a good airhead crew, link: http://advrider.com/forums/forumdisplay.php?f=85 they would know best, i think there is only like 10 of us on here that have airheads.
Mikuni vm38s, i have no clue, i know stock r100s run 34mm carbs, i would assume you would want to lean it out
