Update: Went out this am, turned key...heard very faint click every time ignition was engaged.
Is this the solenoid in question?
The cylinders are not getting fuel. Could the main jet be plugged?
In the am I’m going to try the carb cleaner suggestion to see if I can keep it running. I’m also going to remove the solenoid and replace it with the recommended bolt. I’m sure this is something simple. I recently had the alternator on this machine replaced by a friend who runs the most highly regarded small engine repair service in our area. At that time he gave it a complete and thorough tune up. It had been running like new until two days ago. Of course, I could just be the eternal optimist?