Boy, you are right on about the time. I started it up and put a stopwatch on it and it went off after 97 seconds.
Since I've only owned it since Oct 2015 I have not done too much to it myself other than oil & filter changes. Is Sec Air pump easily accessible? I may consider the re-greasing option. Thanks for your response. Oh, I should mention there is no noise after it winds down and then goes off.