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needle jet = spray nozzle of sorts, placed prominently smack center of venturi. If its missing, proper atomization and spray will be compromised. As the throttle plates are opened, venturi velocity increased, slide rises, needle taper determines clearance...normally creating an atomized fuel "spray". But without the needle jets, the sunken emulsion tube is then the next surface exposed to venturi. The ID of the (now missing) needle jet and the ID of the emulsion tube differ, as well as their placements.....resulting in unmetered fuel entering the venturi.
Think of your garden hose with spray nozzle on, then removed.
As the presence of needle jets (all parts, for that matter) is confirmed both in receiving from user and final shipping of finished carbs within my service...never an issue, nor ever needed to become one.
I'll now yield to other members further comments.
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