I agree with Tatolazo, start with 1 1/2 turns open on both needles. Let the engine warm up for about 5 minutes and then readjust the low needle to give max RPM with throttle only slightly open. Then open the low needle a quarter turn more. Now increase the speed and see if it goes up smoothly, if not then open the low needle a little more. Then run it on full speed and adjust hight needle to get the max RPM. Now open the high needle 1/8 turn more. Try the engine at various speeds and fine tune once again repeating the above procedure.