Leave the low speed needle alone when you first fire up a new engine. They are (as a a rule of thumb) fairly close from the factory. Get your high speed needle set first, following the above suggestions. Then set your idle. Close the throttle. Let it idle. If it slows down and dies, it's too rich. Turn the idle needle in a tiny bit. Speeds up and dies, too lean. Back the needle out slightly. Turn it 1/16th to 1/8th turn at a time. Keep it up 'til you get a steady idle. It rarely takes me more than 3-4 tries to get close enough to fly. Then it can be fine tuned a little if it still needs it.

Plus, take your time and run the engine for a bunch of short runs. Two minutes at first, gradually extending them to 7-8 minutes. Let it cool 10-12 minutes in between. Do that cycle as much as twenty times. I know that it's a lot, but an engine heat cycled this way, run a little on the rich side, and fed fuel with 20-22% oil (at least a little of it castor) should never wear out and give you first flip starts every time.

Even the instructions with a lot of engines basically say, run a tank through it and go fly. But they are in the business of selling engines.......Break one in right, and you'll be amazed at how friendly and dependable it'll be.