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Yes, your engine is running too rich.
As the engine warms up, the auto-enricher slowly pushes a needle down into a cold-start jet, eventually cutting off the fuel from it after the engine warms up.
If it isn't hooked up properly, it will never push the needle down and cut off the excess fuel.
The good new is, that it starts properly. The bad news is, it runs way too rich once warmed up. If you turn back the air/fuel mixture screw to lean it out, it becomes almost impossible to start when it is cold.
It needs to be reconnected to the electrical system.
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