I joined this forum when I started searching the web for answers to why my MS 390 seemed to be running hot and a lot of search results were linked here. Have not been a really active member but always looking for information. Anyway back to the subject of this post I was talking to a friend who has had a outdoor furnace for at least 4 most likely 5 years and the subject came up of saws he’s asking me what I run and why I tell him Stihl because that’s what I’ve always run (grandfather was a logger mill owner and he always had stihl so I just followed his lead). Brand doesn’t matter in this case. He tells me that his newest saw is about to die on him and he thinks he is going to get a different brand the first lasted a little over 2 years and this one a little longer but that it’s in its last leg. I questioned him on what would kill a saw in 2 years fuel, oil mix, maybe storing it outside every thing I could think of with my limited knowledge. He had the right answers for my questions of fuel and mix so we talked more I asked him what the saw was doing and he said runs strong until he puts it to wood then it dies takes forever to cut a block. I start thinking it’s running lean or having fuel delivery problem. This conversation went on for a while trying to figure it out and I told him to stop over later with the saw at my house and I would try to figure it out for him. I told him I was going home to sharpen a couple chains and that if he had any that needed sharpened to bring them I’d hit them while I was at it. At that point he lost all color in his face and looked like a deer in the headlights and he said you have to sharpen the chain!!! I felt really bad that he at that moment felt like a @$$ but at least he didn’t have to buy a new saw. He showed up later saw in hand it was to late for that chain and bar both scrap it’s a wonder it didn’t start a fire. I told him to go to where he got the saw and get a new bar and chain or 3 and ask for the proper file and come back I would give him a lesson on sharpening a chain. Then I asked him what he did with the first saw and got the deer look again and he said dumpster please don’t tell my wife. Not doing this to make fun of my friend. He is a really smart guy in most situations just not a good wood butcher . Makes me glad I had a great teacher in my grandfather and I found this forum to help me with the mechanical side of saws. Thanks for past and future help. Shawn Going to get my buddy to at least lurk here for a while to gain knowledge.