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That's into the needle-needlejet circuit. Mine was exactly like that when I got it, with surging at steady running speeds. I shimmed the needles something like 1/2 a millimeter and it cured it. When Ducatiman restored my carbs to new condition he asked if I wanted to keep the shims and I said no. When I got them back and installed them, EVERYTHING about the carbs and fueling was perfect and no shims were needed. I assume there was some varnish or other obstruction in the needle jet circuit that he removed.
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