Idle mix
If before the replacement of the needles etc (why did you do that anyway, never seen an XT where that was necessary), the engine ran, and you did not change anything else, I'd guess the idle mix is now too lean, as you have installed new, not worn jets.
The easy fix is to adjust the idle mix, see earlier posts.
Always a good idea to have a good, new spark plug BTW.
If the above doesn't work, start worrying about the following:
Further, to install new jest you have taken the float bowl off. You sure you did not bent the float or something?
Is enough fuel arriving in the float bowl?
Are the connections between carb and cilinder head airtight?
Auke
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