hi guys, got a 426 here and basically cold it will fire up pretty darn good, i just rebuilt the sucker, high comp piston, i think its 13.5:1, replaced all valves, did auto decomp mod it idles and runs strong, however when you let off the gas, it does not pop at all, my 06 yz450f pops.... also this bike has a twinair filter, so basically heres my problem, the big one, when its hot and you want to start it.... good luck, hot start does not help, you know what does? CHOKE! if i put the choke on then the sucker starts right up... so thats not right, now is it? my 06 450 i dont need hot start or choke i can just give er a kick and she fires up, so i'd say my 450 is properly jetted, so i havent had to touch my carb, and so i dont know how to adjust these carbs on these bikes and how i should go about it? so what would you guys recommend me to touch on the carb first? since it wont start hot unless you use choke to get it going and it does not backfire at all when downshifting, must mean its really rich? or more like lean possibly?, Thanks!