I just got my son a 2005 Predator 90 and it won't stay running sometimes when idling. Give it a little gas and no problem. How and where do you adjust the idle??

 

From the front of the bike, look at the center of the engine and go up till you see the carb, the idle screw is sticking out of the carb and hangs over the midline of the engine about 1/2". It is about 45 degrees from where the intake of the carb is. Get the quad warm and then adjust the idle so it runs on its own.

 

and DONT LET YOUR KID EAT IT!!