More than likely, the idle (pilot) jet is partially clogged. This is common when it will idle fine with the choke on, but won't idle without it. Sometimes a fuel treatment will clean the carburator, but not usually successful in cleaning the idle jet. Usually it requires removing the carburator bowl and and cleaning with the use of a gauge wire. The idle jet is usually recessed (next to the main jet).
A good video to show a generic carburator rebuild can be found at this link: http://www.youtube.com/watch?v=exa467_eoXw The guy goes through a pretty detailed description while going throught the process. The carburator will not look exactly like yours, but it will be similar internally.
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