I have an 02 warrior 350 that runs good but has a cough through the carb, it only occurs on idle and is intermittent. I have checked the timing and valve adjustment and they are both good, I have also cleaned the carb and unhooked the parking brake switch. It runs fine through the gears and doesnt lack for power, any help would be greatly appreciated

 

The carb is either still dirty or the fuel screw isnt adjusted right.