Missing how? Blubbering or bogging? It idles good, but do you have the idle screw cranked in far to do it? If it idles good on the pilot ckt without cranking in the screw, that tells me the pilot is good or very close and the "missing" is from the needle. That may be a lean dia. needle for an older 250 with an AS I carb. I've jetted a few 250s and also a Husky WR250 with an AS I conversion, and all prefered a much richer straight section on the needle than a "W" dia. for best off idle torque.
Evaluate jetting under a load, not unloaded in a low gear. Find a safe place with a slight incline.
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