I have to pass this on. I bought a Stihl 034 in 1986. In the last 10-15 years, I have hardly used it - sometimes it sits for 2-3 years at a time. I don't drain the tank or even replace the fuel, just top it off with some fresh stuff. Today I brought her out to cut down a 25' spruce tree. She started on the 3rd pull and ran like a clock with the sweetest idle you can imagine. The only repair I have done was maybe 16 years ago when I had a bar oil leak. Been so long I don't remember exactly what I did, but it involved a new rubber seal. Wow, what a machine!