Always remember this:
When finished using the saw, drain all fuel from the tank, start saw and run until it quits.
Always use leaded gas, not the crap forced on you at most gas stations; I get mine from co-ops but some areas do have leaded gas at the local gas stops, just not in my area. Non-leaded will ruin the carb and also make for hard starting.
Ranch Hand
With all due respect Ranch Hand, I'm not aware of leaded gas being available anywhere, except maybe Av-gas at an airport, and they are not supposed to sell it for non aviation use.
The problem with today's gasoline is that they add ethanol to it. The ethanol is what can do damage to certain parts if they are left to soak in it.
Best bet is to seek out the odd gas station that still sells Non Ethanol gas. Around here it is fairly easy to find, it is usually marketed as "boat gas" and is marked/dyed, therefore not legal to use in machinery that travels a public road.
That is all we use on the farm, for any gas powered engine.
One other thing; we treat all our gas with a stabilizer. That way we are assured that ethanol or long storage intervals are never a problem, fuel wise.
Even after a year or more, the gas in the tank and in a carb is still good to use.