I had no visible wear on either sprocket so I didn't change them. I did spray extra chain wax into the master link before installing. I also left the white lube that came on the chain on.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe