The factory needle settings are way too rich especially the low. Lean the low a little at a time and see if it improves. It may just be loading up with fuel and won't transition (too rich low needle will cause this). This is what mine did out of the box. I leaned the low until it was perfect and the engine engine came to life.

Come to think of it, just leave it on the ground and let it idle for about 10 seconds then goose the throttle stick. If it sits there and just sputters fuel, smoke and takes forever to come up to full RPM, the low needle is too rich. Lean it until you can leave it sit at idle for 5-10 seconds and the RPM snaps up as fast as you can move the stick. That's how all mine are tuned.