ok i have a98 YZ400F and just did the 03 cam mod, power paks dividers in the carb, new timing chain, FMF titanium 4 silencer and mid pipe (stock head pipe), and a hot cams intake cam. i ran it for about 20 minutes and noticed it was idling funny and losing some water out the over flow tube. it was idling kinda hight so i adjusted the idle a little and then it would die almost and then jump up high on idle and then back down. it surging for some odd reason. i am running stock jets in the entire carb. what is a good setting for the air fuel screw on this bike with these mods. do i need to rejet for the cam change? when i killed it i couldnt even come close to putting my hands near the motor. i have the air fuel screw set at about 1 3/4 turns out.