Dealer should honor warranty unless they suspect something nefarious. Even then, most dealers make the effort to fix saws they sold.
Any chance someone put oil in the gas tank at some point? My buddy just did this with his. Rebuilt the carb, cleaned muffler screen, and tuned it with limiters removed to get it right. Runs good now.
There you go! Cleaned the muffler screen , my 193 was running a little rough, i cleaned the muffler screen, and bingo, away she went, in the process i accidentally kind of cleaned the screen a little too good, and opened up the holes in the screen a little more, not only does it run better now, it even sounds better, Check that screen and see if its dirty, bet thats most of the problem.