I couldn't turn down the offer of a free Stihl 051 AV chainsaw. The PO said it did run several years ago, but had carb problems . Now he can't get it to run at all and didn't want to mess with it. I got it home, blew some of the crud off, and checked it for spark. Spark was good so I put some new fuel in it. No go. Pulled the plug and poured a cap full of fuel mix in, still nothing. Pulled the air filter and dumped 2 cap fulls of fuel mix down the carb. Three more pulls and it fired up. It will idle ok, but boggs when you give it throttle. It got a little better after it warmed up, but still not good. I had to put it away at that point and will try some carb adjustments next.