Re: '77 Motobecane Carb Issues

Legendre /
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The carb in the photo is not a Dellorto - it's a Gurtner.

Gurtner carbs (at least this type) do not have an idle mixture screw; the screw you picture is the idle speed screw. It affects idle speed, and nothing else.

There should be a black rubber gasket (like an o-ring, but flat) inside the mounting flange of the carb. It helps to seal the joint between the carb and manifold. They are frequently missing.

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