Another handy and simple test to see if you're running too lean is the "pinch test". Adjust your needle to what you think is an appropriate setting at wide open throttle (WOT). Now pinch the fuel feed line for about 1/2 second and release it. If the engine slows down or quits you are too lean. If it briefly speeds up you are slightly rich which is where you want it. If nothing happens you are a little too rich.