HSN = 5 turns out, then start leaning 1/8th at a time if needed.
LSN = 3 turns out, then lean or open as needed to get at least 30 seconds idle without engine clogin to the point of dying, it should hesitate a little after 30 seconds but not die. To do this, let engine idle then press full throtle for a second or two to clean it out, then check the 30 seconds idle.
Mid Needle = flush with carb body with slot for screwdriver pointing the fuel inlet, then DON'T EVER TOUCH IT AGAIN.

AFM