to tell you the truth, 900rr's are carbed too so that doesnt make a difference. if ur bike is mint right now i would buy a beat up 900 and play with that but if ur bikes messed up already u have nothing to loose. gear the sucker down and play with 12's. i know alot of peeps who 12 on carbed bikes and they like it better than f.i bikes. too eaches own i quess.