The base of the carburettor has warped over time causing air to be drawn into the manifold. This causes a rich mixture and rough running.
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Here we can see the carburettor base warped by about 1.5mm. |
Thanks to Darrin of
Citroen Classics for the advice. This is a common problem and with some careful filing the base was straightend and the holes for the studs re-drilled at 90 degrees. While the carb was off it had a good clean with all the jets blown out, new gaskets etc. The carb was refitted and the mixture and idle speed adjusted.
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Float height cheked at 5mm and new gasket fitted. |
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The carburettor base after filing, a little blue hylomar around the edges just to make sure. |
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New insulator and gaskets on inlet manifold. |
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Carburettor refitted ready to adjust mixture and idle speed. |