well shit, keep goin round and round on this. Figure out the carb is a keihin for sure. Body says pwk on it, but it has the cap that is held on by screws (not screws on). the only one keihin makes like this is the 28mm, but he said the main in it is a 172, stock in a 28mm is 135 i think. i'm betting it is a 28mm, it jsut doesnt quite all add up.
Edit:
And if you go by this http://www.carbparts.com/keihin/pwk_jettin....htm#Dimensions and want to measure the carbs to see what they are, for the 35-39 the inlet/outlet dimensions are the same, htf do you tell the difference?