Never heard of echos. All I can tell you is that in my exp. a Husqvarna saw tears it up. A finely tuned Husky will go right through wood like warm butter. Sorry I can't help you spiker.
OTF I think you are correct Most likely was LOM (Lack of maintenance) & could happen to any brand those carbs can be finicky it doesn't take much to mess them upfriend down the road has an echo saw that he got for a b-day present last year only thing i've ever heard him say was he already had to replace the diaphram in the carb on it, but i would think that was because he probably didnt drain the gas or put a fuel stabilizer in it for this past winter storage.