I was cutting up a tree yesterday and my saw (poulan 335) ran great throught the first tank of gas. Re-fueled and resumed cutting saw suddenly dies in the middle of a cut, like i hit the kill switch. I start it again, same thing again, and again, and again. Let it cool down, start it runs great for about 15 seconds, as soon as it get warm it dies again. I think I may have damaged the piston, spark plug was a medium light gray color. I inspected the piston through exhaust port and through the intake and I don't see any thing obvious, but I can't see the whole piston. I also inspected the cylinder wall the same way ( can see the whole cylinder wall). There seems to be a shiney line on the cyliner wall just above the intake port, rubbed on this line a little and there is no groove or gouge and there isn't a corresponding mark on the piston. Is there a definitive way that I can test to see if piston/cylinder damage is my problem? Could it be the ring? Is it fixable, how much would a shop normally charge for a piston, ring, and boring if necessary? I'm trying to see if it would be worth it or get a new saw. I think this saw only goes for like around $250. I'm doing a compression test tonight, but I'm not sure what the compression should be and I thought I heard somewhere that the engine should be warm first, and the saw dies before reaching operating temp. Any advice?