Why tell someone to buy a carb for a chainsaw if they haven't yet put in fresh gas and gave it a pull? Seafoam? Why? The issue is if it's ready to run and chainsaws typical is the fuel lines get hard not so much clogged. You don't "do" the carb unless all the easy stuff has been checked off. Not that carbs dont go bad. My Kohler saw mille engine carb needed replacement recently and even though not that old an engine, Kohler carbs are NLA except a few high priced old stock carbs. I bought a $14 Amazon carb and other than an hour to get the float bowl to seal properly it now runs like it should. Pure gas is not available in my area of many, many loggers and chainsaws. This: Like said, dump the old gas. Using a hook/wire pull up the fuel pickup line and see if the filter looks OK and the line is pliable and not going hard. Clean the air filter. Clean the spark plug. Take a look at the muffler exit hole and make certain the hole is open and not plugged with mud daubber mud. This is very commonly found on stored 2-cycle engines with tiny exhaust holes. They will not run if blocked. Fresh fuel mix and see if it starts. With ethanol fuels I prefer storing 2 cycle engines dry, not wet, as the alcohol dries out the carb diaphrams over the winter. They get wrinkled and don't work. Ethanol makes small engine repair people much of their income, a well known fact. I'm not a Husky repairman but I KNOW chainsaws as a user and a mechanic who does his own. I'm a Stihl owner/user but if I were to change brands it would be Husky!