I have a set of 38mm Mikuni carbs that i am not sure what they are and a set of keihin PJ carbs that measure 34.5mm. which would be the better set to run, i know the motto the bigger the bigger just curious i am new to alky, i just got the bike not long ago and it is supposed to be a 7mm stroker it had trinity out of frames and i have switched to CPI in frames and now it really bogs on the low end then picks up on the upper end. i believe that it is rich on the bottom end. It had the 38mm on it when i got it but i had the keihins i bought back in the day. the 38mm has 50 pilots and looks like 122 mains that have been drilled.