The best way to adjust a heli is by using a temp monitor to set it at about 220-230 degrees. They sell a hand held one for about 80.00 or you can get one that mounts on the heli for 30.00 I use it to set all of my engines to run just right. One way to tell if you are running lean is while in a hover for 2-5 minutes the heli starts to get very unstable or the engine just quits from overheating. If the heli is running to rich most of the time you hear alot of noise or it will not lift off. It is always better to run it a little rich, the best needle pisition on the OS 32 for me has been 1 turn open and then 3-5 clicks open from there.