Well, after many hundreds of pulls on my almost new MS 311 I checked for spark and guess what?? NO SPARK NOW. I took it apart to check spark and all the wiring and grounds were good and still no spark...I bought a 'new' Stihl coil and guess what..NO SPARK. I took it to the dealer and within an hour he called and said it was running. His diagnosis was that the crankcase had fuel in it and would not allow the saw to turn over fast enough to generate a spark. He said it needs at least 300 rpm's to do this. I never choke the saw to start, so I question how did all this fuel get there anyway. Secondly, I have never had a machine of any sort that required that much speed to generate the spark. If this is true, I will try it tomorrow morning when cold. If it is the case 300 rpm minimum, this may be the culprit of why so many of these M11's are hard starting I read about on many blogs... We will see what happens tomorrow ?????????? I will try the mixture also, thanks.