Start by looking at the air filter. You may have clogged it up. After that,
check your manual for the mixture valve adjustments.

Almost every brand of 2-stroke oil contains anti-varnish stabilizers. Oh
yes, use premium gas.

Last resort, and this can happen when you let the gas run out entirely and
suck a wood chip in, open and clean the carb flappers with clean gasoline
(no oil).

"Shawn Wilson" wrote in message
...
Hi,

I have borrowed a 13" Stihl chainsaw. It worked fine on the gas that was
in
it last fall. I filled it with (mixed) gas that was about a year old.
After
that it didn't work very well (stalled easily, had little cutting power).
I
poured it out and put fresh gas in. It's still not working well. I was
wondering if anyone has any tips or links to good do-it-yourself type
sites?
I'm (obviously) a newbie when it comes to this.