hey guys , i have a 2002 drz400s , the bike has the 3x3 mod and a full fmf exhaust with powerbomb. recently purchaced the bike., and the engine would not even idle with the choke off. the carb was very gunked up, i pulled it apart, the pilot jet was plugged. cleaned the carb. and got the bike running farly decent. good ecceleration, have alot of popping on decel. after idling for a few minutes the header pipe glows red. . i am also looking to rejet the carb to compensate for the exhaust and 3x3 mod. any sugestions on what jetting setup would work best.. and what could be causing the popping and the exhaust to be getting red after idling. i appreciate it.