I have a Husky 390xp. A couple of months back it pulled over really easy and took a few more pulls than normal to get it started. Since then it has been mostly starting on the first couple of pulls. The other day I finally decided to try the Alaskan mill I bought. I set it up with a 42" bar and ripping chain. Made 5 slabs out of 16" wide maple that was about 5' long. I tried this just to get a feel for the process. I shut it off between each cut. I filled the tanks and went to start it, but got nothing. The saw had completely cooled off. I went in and had lunch. The plug looked like crap so changed it. Still nothing. Gave it a shot of starting fluid still nothing. I pulled the plug and held it against the saw. I have spark. It is getting fuel. I pulled the muffler and the piston looks good no groves or scoring. A little light brown in one spot, but nice and smooth and shiny even the light brown spot. With decompression value I was around 90 and with out I was around 110. Both of these were cold and after a half dozen pulls. Saw felt like it had plenty of power when I was running it. Seemed strange to me that after shutting it off it would not restart. Is this typical when the rings a toast? Also there is a white / cream color residue on the exhaust exit that I have not seen before. Any help is appreciated.