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Hello my name is Noel and I will assist you. So if you have rebuilt the carb i suggest you set the idle air mixture screw to 1 and 1/2 turns out from fully in position. Also those two lines under the carb need to be properly connected as if there is an air leak fro there the engine will not idle. As for the metal link yest it has to be connected to the upper part of the plastic arm that moves with the choke and the trigger under the flywheel. In the event that the engine still does not idle i suggest you rebuild also the fuel pump connected to the side of the carb. Other then that the engine should idle fine.