Small Engines (Lawn Mowers, etc.): B/S throttle/mixture issue, engine model type, lever switch

Question
Eric:

I have a B/S 4.5 HP no throttle engine - the mower is a Murray combo mulcher, 224110X92A.

The mower starts, then stalls.  I put clean gas in and sprayed carb cleaner into the carb.  Didn't seem to help.

The throttle control (if that is what it is) is controlled by a spring assembly, and a lever/switch on the front of the air filter.  The spring assembly is worn and has no ability to flex in either direction.

If I manually take the switch on top of the carb and move it toward the handle, I can bring the mower to a low speed and it stays on for some time.  If I press the switch toward the front of the mower, the engine revs high and then dies.  I can't seem to get the switch in the perfect position.

Does this sound like the problem, and if so, how can I fix the "idle" that is on top of the carb?

Thanks,
Chris

Answer
I believe the carburetor is dirty causing most of your problem.  Send me the engine model, type and code numbers so I can look up your engine.  The engine model number probably starts with a 9, 11 or 12.  The rest of the engine numbers will be right next to the model number.
Let me know the information so I can look up your carb.
Eric