I will add something that hasn't been addressed yet. This doesn't have to be done super often but in my opinion should be done once a season or so depending on how much you cut. Remove the recoil, clutch cover. And muffler and clean the "saw cake" out of everything. Pay close attention to the cooling fins. If it's not bad, a little compressed air will do but if you are someone who tends to overflow the gas and bar oil the stuff gets pretty caked up. I've pulled recoils off of swas where the only thing you could see was the flywheel and the plug wire poking out.
here is an example. Stuff was 1/2 inch thick in places. Outside of the saw looked clean.