Motobecane av88 - only runs at high rpm

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Need some help please! This is about a ~1967 AV88 motobecane mobylette (the blue ones).

New to me a few months ago. Started/ran fine every time (30mph) until the carb (dellorto sha 14.12) rattled off during a short flat run. Visual inspection fine, popped it back on and it ran as good as before at WOT. But, wouldn't idle and wouldn't run below half throttle, as soon as you slow down it dies. Takes a lot of peddling to get it going fast enough to start if it's off the stand!

Popped carb off, inspect/disassemble/clean/reassemble, but it was very clean with clear passages already. Still no improvement.

Checked spark, it's strong and the plug has less than an hour on it, still in like new condition.

It's puzzling to me since it worked fine before it rattled loose.

Any thoughts appreciated. Thanks!

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