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Old July 20th, 2021, 02:25 PM   #5
Triple Jim
Guy Who Enjoys Riding
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Name: Jim
Location: North Central North Carolina
Join Date: Jul 2016

Motorcycle(s): Ninja 250

Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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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