There is no doubt in my mind that al-key-hall in gas and the mixed oil is the cause for many 2-cycle carb failures. Gas hoses, bulbs, diaframs, Don't care which which brand. You may find that chain saws use the same off the shelf carb, like Zama or walbro, May not have the spelling right.
Didn't use my weedwacker much last year, too dry. Think the oil in the gas gummed up carb and had to get a new carb. Couldn't clean the carb with no jets and get it to idle right.
Just wish someone would come up with a 4 stroke chainsaw, however they would still have to use a carb with a diafram.