I finally flew with my NX 1.00 today.

The "mount the engine sideways" suggestion did not cure the problem at all. It merely flooded out when I took a turn instead... sigh.

In my case it was NOT a problem with fuel delivery or tank mounting...

Rather the low speed limiter is EXTREMELY sensitive. 1/4 turn is enough to go from blathering rich and unreliable to a perfectly running engine.

In my case I had to turn the low speed needle to correspond EXACTLY where the limiter post was set to on the lean side +1/8 turn in.

This meant that I had to lean the engine out just slightly MORE than the factory setting.

Once done the high speed needed adjustment, and all was well with my 1.00NX.