You need to start over with the needles about 1.5 turns out each. Since one needle affects the other, you can get yourself into a postion where you've got one way too far open and the other about closed, and it will try to run, but not quite right. If/when that happens, just start over with the baseline 1.5 to 2 turns out on both needles and start fine tuning again.

If that doesn't do it, I'm afraid you have something wrong internally with the carb.

AV8TOR