I have a 041 AV Stihl, I am guessing it is from the 80's. It was my uncles saw, he passed away I go it! It was not used alot I would say a couple times a year thats it! When I first used it it needed a tune up, I did it myself since I do it all the time at work. Still couldn't get it to run with an " strength " so i took it to a local stihl dealer, and they fixed it up for $90.00 Ran better, but still doesn't have any " strength" I say this because I am comparring it to a 2 year old Stihl 026 pro that I bought for my father. That 026 will cut through anything with more to spare. It has a new chain with an 18" bar. My 041 AV has the same thing 18" bar with new chain. It is a chore to cut with the 041 AV, you set it down and pick up the 026 pro and it zipps right through it! What gives? By the way I thought maybe the bar on the 041 was pinched, so it has a new bar too. Anybody ever have this problem? Is there a time when the saw just looses power from age?