When i first start it should it be realy spudery and smokey befor it gets warm, After it warms up i think i have the mid to top end jetting good becaus it pulls hard from about 1/4 to WOT. I cant get a good idle and it bogs down threw 1/4 throtle then spuders and picks up and kicks ass after that. The air screw makes no differance. It has the lowest number pilot jet i can get for it a 15. Air filter is clean and not oiled to much. New plug. middle clip on needle. With my mods i have a 330 main. I know that sounds big becus im at 2000 feet but i had a 300 and lower and it would bog down at wot but didnt with the 330 main.