You need to do a full throttle run, 900-1200ft. with throttle wide open. At end of run with throttle still to the floor cut the ignition. When engine stops close throttle, pull over, pull plug and read. Doing it this way tells you if main jet is too rich, lean or just right and takes the pilot jet out of the picture. Once you have the main jet just right then you can work on the pilot jet. When I done mine I had the clip on needle half way. Getting the main jet correct first makes tuning much easier and assures you the engine will not lean out at full throttle.
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