this is an old way of doing it(idle mixture)crack the barrel open the size of a pin thn blow thrue a the fuel line to the carb and start opening the idle needle from the fully closed position and when the air starts coming thrue keep going 1/8 turn.hi speed should be out at least 3 turns when doing this to make it easier to blw air into the idle bar.It is a good starting point for idle.OS makes a pretty good carb so if you can,t get it running theres probably a defect.good luck