This morning I tried starting the mower again. After a couple of pulls of the starter cord it snapped back viciously, never done that before. Started but quite smokey, ran a short time then stopped. Now when I pull the cord it seems the decompressor is jammed shut. It is the type with the 3 small clips. I would have thought a "failure" in the decompressor would be a hole in the diaphragm and that would mean the valve remains open. Is somethinge else going on? Appreciate any advice here.

Styx