I agree with others that it should have been cleaned prior to disassembly. Also at 4 years I would have replaced all of the fuel lines, the primer bulb and the fuel filter. I hate to say it but you really only did a half assed job on this carb rebuild. All needles and jets should have been removed and all of the orifices cleaned out. You're setting yourself up for more fuel issues in the not too distant future by taking these shortcuts. Sorry but that's the way I see it. Your opinion may differ from mine.
Serving Greenville, Winterville and Ayden NC