Funflyer, Turn the high speed needle out about 2 turns and crank the engine. After about 20-30 seconds start turning the needle in until you hear a high pitch and max rpm. A little at a time. Once you have found top rpm, slowly turn the same needle out until you hear the rpm drop a little. The high speed is now set. Lower the throttle slowly until your at idle. Pinch the fuel line for just about 1-2 seconds, What did the engine do? Die? It's too lean. Turn the idle screw in the center of the throttle arm out 1/4 turn. Re crank and re pinch the fuel line again. Now if the engine revved up before dying when you pinched the fuel line the first time, It was too rich and you should turn the idle screw in 1/4 turn. Now check how it rev's up and see if the transition is ok. After setting the low speed needle, go back and readjust the high speed needle just like you did the first time, just a little rich. Now your ready to fly.