Really sounds like the needle and mainjet not in harmony. If you know the type of jet kit which was used, the jetting database would be of help to get you in the ballpark. Dynajet jets numbers do not match keihin jets.
Ninjettes naturally have a flat spot in that rpm range.
You can experiment with using the choke in that rpm range. If choke helps, the mixture is lean in that rpm range.
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