It is esential that you neither drown the plug (too much tickling, too little air), nor give it too much air by opening the throttle too much.
Most machines need a slightly higher throttle for starting, but that will eventually weaken the mixture, so it can be a very delicate procedure getting it all together right, if you don't have enough experience to "read" the engine. By that I mean the feel to guess if your giving it too much, or too little throttle and if you should close, or open your choke slide, and if you should tickle the carb once more, or leave it as is.
This highly depends on the temperature of the engine. When the engine is warm, it might even need up to 1/2 throttle for it to start reliably.
If your engine starts cold without choke or flooding though, your setup is way too rich on idle and/or the needle jet+needle are worn and need replacing.
Have a nice weekend!
Andreas