The Stihl MS261 is a very lightweight, convenient & durable professional petrol chainsaw. The MS261 has up to five times longer filter life compared with the MS260. The Stihl MS261 has an easy-clean HD2 filter, controlled-delivery oil pump & practical features such as a stainless steel muffler, captive nuts on the sprocket cover & monocoque top cover with 3 quick-release fasteners. Up to 20% lower fuel consumption & up to 50% reduction in exhaust emissions compared to previous Stihl models with Stihl's 2-MIX technology. The Stihl MS 261 has a 50.2cc 2-stroke engine & is available with a 13, 15, 16 or 18 inch bar.