If E10 sat in it might have the E10 snot inside. I'd try fresh fuel first, sometimes the crap will run through, but don't push a saw running like crap until you know the cause.
It's a roll of the dice if the carb comes apart without tearing gaskets. A complete kit is only $10-15 and good to have on hand.
Coat gaskets with some vasoline when you put things back together, then they won't stick next time coming apart.
Does the saw have both Hi and Lo settings? If not look into getting a WT-194 carb
