Is the place you bought it from a true logging type supply dealer that routinely fixes Stihl products? This should be an easy fix if so. Around here, you can buy Stihl at some of the hardware-type chain stores and in those cases you get a 17-year-old assembling your saw.

The dealer I buy through, told me recently about a guy who bought a new Farm Boss from a chain store and brought it in because it wouldn't cut. You guessed it, the chain was on backwards. Not sure who is more at fault with that though? The store that set it up or the owner?