Bought a ms261 in 2010. Cut 8 cords a year for 5 years, and now just habitat stuff, bonfire wood out back, or firewood weekend up at camp. Ignition coil died in 2018. Other than that it's been great. Also had problems wth oil leaking out, needed a new oil cap, common stihl issue.
I keep 3 chains and bars with me. Always a brand new bar and chair, so I don't have to drive back to get one. A good 16" and their semi chisel non-ansi chain, yellow key. The ansi one has dual depth cutting guides, but slower cut. The 3rd bar and chain is a beat up one, dirt dipping, root cutting, etc.
Chaps, several wedges, stihl helmet, woodchuck timberpro cant hook, and really love the stihl 2-in--1 ez file. I use a scabard and chalk to mark the cuts when doing firewood. Makes the piles alot neater.
Shortest bar you can use is the right one. Keep that air cleaner in good shape too.
Bought a FR70 weedwacker the same time too. Used to weedwack and acre foodplot 2 or 3 times a year in under 2 hours. Use the red line.
Everything gets the silver stihl synthetic oil and stihl bar oil. Been very happy so far.
Bigger small engines have bigger fuel jets. 32cc little motors plug alot easier.