I am not sure if it is related or not. The engine starts OK, but it did not want to keep running after less than a minute or so. The engine RPM went up and down, and then shut down. I could restart it with no difficulty. This problem seemed to be working itself out, but I had to leave it before I could try to keep it running.
I noticed this condition after putting the snowthrower back together after checking the belts, which are OK. The snowthrower was up on the auger housing during this process.
It was while checking the machine over that I noticed that the ground wire was not attached to anything on the one end. This wire does not appear to be part of a wiring harness, either on the machine or in the exploded engine diagram. What I could not find, of course, was a picture of how and to what it is connected. It also seems counter intuitive that one could order a replacement part whose plastic fitting is essentially not connected to anything.