The recommended initial needle setting is generally on the rich side. Try closing it 1/4 turn then advance to full. If that doesn't do it, try another 1/4. Once it runs at full throttle, adjust the needle so you get maximum RPM then richen it slightly so you get a 200-500 RPM drop. since this engine is new you may want to run it even slightly richer than that for the first flight or two. Next adjust the low speed mixture screw. These also generally arrive a little rich from the factory. Adjust it so you have a smooth, reliable idle and a good transition to full throttle with no sagging or coughing & spitting. Be sure to re-check the high speed after resetting the low. You may also have to re-adjust your idle speed after setting the low speed mixture.

Once it is running good, don't mess with it until there is a fairly decent change in outside temps. Even then, you'll just need a few clicks to compensate.

I say that the factory settings are usually rich. I've found this to be a general rule but there could always be an exception out there too.