To properly clean out all the passageways, you must completely disassemble the carb (all jets etc.) & use "Berryman's Chem Dip" carb cleaner. Let the carb soak for 10-15 minutes & then flush it out with water followed by blowing it out with compressed air. You can put your finger over one end of the passageway while blowing it out to see if the air is coming thru. If not boil it out again-sometimes it takes more than once to remove anything that has solidified in the passageway. I have a Dellorto with the same problem on my garage shelf. Nothing has helped so far. Will eventually send it off for a rebuild or possible replacement. In the meantime the rebuilt Solexes are working just fine.
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