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However, the diagram above says that is the description of the carburetor for a 91200. The Code tells us its date of manufacture.

Your engine is a 91200 (the final 2 in 91202 just tells us it has a rewind starter.) Now, you haven't posted the Code for your engine (the set of numbers stamped on the cowl, right after the Model and Trim which you posted). Here is the page from the technical manual that hopefully describes the carburetor:

By my reading of the diagram on, Item 147 is a fixed jet, where Item 173 is an adjustable needle. We are having some communication problems I think. However if the black smoke still occurs with the filter element removed, we will have to discuss a carburetor overhaul. We can then talk about how to deal with the butchered idle mixture adjustment. If the underlying problem is just a dirty filter you will need to buy a new one and fit it. Do not continue to run it without the filter: this would allow dirty air to enter the engine, and wear it out. Run the engine briefly without the element fitted, and see if the exhaust smoke is eliminated. I suggest you run a brief test: remove the element from the air filter, and inspect it for dirt build-up. The usual cause of extremely rich mixture on old Briggs engines, is a blocked air filter element. The carburetor is a Pulsa-Jet - you can see an exploded view of it on of the Illustrated Parts List. Http:/ / / BriggsDocumentDisplay/ 18jsBLXBnfBhU7y.pdf Here is the Illustrated Parts List for the same engine: Http:/ / / BriggsDocumentDisplay/ flmvtLX-nfBhU7y.pdf Here is the operator's manual for the Rover 45 engine:

Because it is intended to adjust only the idle mixture, not the main mixture, his efforts were presumably fruitless - though he may have prevented it from idling, and also damaged the adjustment needle and its seat. Hi adeas, that carburetor is supposed to have adjustable idle mixture, but it seems the previous tenant has thrown away the spring and screwed it in hard to try to suppress the symptoms of a malfunction which was making it run extremely rich.