STIHL MS 311 PETROL CHAINSAWSTIHL MS 311 PETROL CHAINSAW 50cm 20'' FarmBoss The STIHL MS 311 petrol chainsaw is the ideal tool for cutting firewood in medium density groups of trees. With this powerful chainsaw farmers and horticultural specialists in particular are well equipped for their work. The STIHL 2 MIX engine impresses with an output of 3. 1 kW (4. 2 hp). Pre separation routing extends the operational time before the chainsaw needs servicing, as coarse particles are