Testing the idle mixture

["Gary H." <62to65mopar@xxxxxxxxxxx>]

Anyone have experience doing it this-a-way? 

Testing the idle mixture on a carburetor-equipped engine: take off the air cleaner; proceed with a completely warmed up engine, choke open all the way, and engine idle speed set to factory specifications. Take a flat object and slide it slowly over the air horn of the carburetor in order to cut off the air flow. The fuel mixture is okay if there is no or little change in of engine speed when the air horn is nearly totally blocked off. If, while slowly sliding the flat object over the air horn of the carburetor the engine speed goes down, then the idle mixture is too rich; if the engine speed goes up while slowly sliding the flat object over the air horn of the carburetor, the idle mixture is too lean. 

Thanks,
Gary H. 

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