I run 34pj carbs on unported cylinders bored 60 over. cpi pipes, cool head w/19 cc domes (pump gas) and V-force 3's. i once had a 2 in 1 setup and i would much rather the duel 34's. i have no issues with the carbs and would never go smaller. my riding elevation ranges from 800 foot to 1400. if you need my jetting send a PM and i`ll get back to you or if i can get time i`ll open one up and see. its bin awhile so i`m not sure off hand.