Check your idle gap first. That is how far your carb is open when your throttle is at neutral. Should be 0.5mm to 1.0mm. I use a thin paper clip as a feeler gauge.

If that is good, then your idle is controlled by the LSN. Get it up to temp and let it idle. Once it idles good, do a high speed pass to clean it out and bring it back in. It should go directly to a stable idle.

If it's good, I let it idle for about 10-15 seconds then punch it. There should be no hesitation or bogging on take off and good smoke. If there is no smoke, you are too lean. If there is bogging, it is still too rich. Adjust as necessary. You may have to adjust the idle screw A LITTLE to get your idle where you want it once you move the LSN .

The videos mentioned by the previous posters are a very good tool.