You bend the tab on the float gently then flip the carb over to about 45' and measure from the top of the float to the flat of the carb body where the bowl sits.If you look close when you do this,you'll see the the tab touch the pin on the needle-if you continue to turn the carb upsidedown,you'll notice that the weight of the float depresses the springy pin on the needle.If you measure this way,you'll be wrong.
You have to measure at the point where the float tab just barely touches the pin-and doesn't depress it.
Measurements aside,a good rule of thumb is to have the have the float(usually there's a bit of a line or square edge before the float tapers in) level with flat of the carb body where the bowl sits-you'll see what I mean if you play with it.
Use a small screw driver to gently pry the float tab one way or the other to get this setting-it's usually better to take the float out and make your adjustment then put it back in and recheck.
Once you have it level,I usually set it so the float is just a bit "above level" This shuts your fuel off sooner so not so much fuel P's out your overflow tube when riding or when leaning the bike on the stand.
If you can almost start without choke(depending on your riding temperatures where you are)your carb is too rich.Blow out all the passages in the carb with cleaner and if it still does the same thing,we can give you more info for adjusting your airscrew properly or changing your pilot jet.