I got out my old Stihl yesterday and fired it up. Like normal it took considerable effort to get it started the first time in a couple of months. Once started and warmed it ran like a real saw so I went to cut some wood. Got on site and it started on the second pull. Cut some wood and ran out of gas. Refilled and no start. pulled the plug and it was dry. Primed it replaced the plug, Nothing no pop no fart nothing. pulled the plug again and checked spark. looks great. plug is damp. Put the plug back in and try again, nothing. In the thirty years I have owned this saw if I had spark and primed it I would at least get a pop when I pulled. I am getting old and my pulling arm doesn't stand up like it used to. So the only thing I can think of is the flywheel key sheared. Getting it torn down to the point of checking that is major so I decided to come here for suggestions and ideas before proceeding.