The carb. has letters next to each needle, and H and an L. I believe the low needle (L) is the needle closest to the crankcase, so the top needle. Turn it out 1/8 to 1/4 turn, and make sure you let the engine burn clean (clear it out) on the ground before take off. My DA150 always had a bit of a tendency to load up some when taxying out.
DKjens