Description The same great MS 261, but with advanced STIHL M-Tronic™ technology for optimized performance in various conditions. The MS 261 C-M has all the same great features as the MS 261 - low exhaust emissions, high fuel efficiency and robust performance - but also features the advanced STIHL M-Tronic™ engine management system. With STIHL M-Tronic™, an onboard microprocessor digitally monitors and automatically compensates for changes in your work conditions including elevation, temperature, fuel quality, varying octane levels and dirty air filters. The end result is maximum performance across a wide range of cutting conditions without making any manual adjustments. The MS 261 C-M also features redesigned cylinders and a slimmer, ergonomic housing for an impressive power-to-weight ratio. Model Features Anti-Vibration System: STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience. Pre-Separation Air Filtration System: This time-saving technology boosts the efficiency of the engine's filter system, doubling the time between air filter cleanings. Air drawn into the engine is first separated via centrifugal force, ejecting the heavier dirt particles before being routed to the air filter. This pre-separation means less dirt to be captured by the air filter, resulting in less frequent cleaning and maintenance. Side-Access Chain Tensioner: The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw. Decompression Valve: The decompression valve, also referred to as 'deco' or 'deco valve', vents compression in the cylinder for easier starting. The decompression valve temporarily reduces the compression in the combustion chamber during cranking and helps reduce the effort needed to pull the starter rope. It is opened manually and closes automatically as soon as the engine fires. Built in the USA: Indicates products that are built in the United States from domestic and foreign parts and components. Reduced-Emission Engine Technology - Caring for Nature: The STIHL Inc. “Caring for Nature" seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions" as being cleaner than EPA and/or CARB exhaust emission standards. STIHL M-Tronic™: This product features M-Tronic™ (M) - a new generation of Intelligent Engine Management that eliminates the low and high speed carburetor adjustment screws, compensates for dirty air filter and changes in elevation and fuel quality for optimum engine power at all times. Specifications Displacement: 50.2 cc (3.06 cu. in.) Engine Power: 3.0 kW (4.0 bhp) Powerhead Weight: 4.9 kg (10.8 Ibs.) Fuel Capacity: 500 cc (16.9 oz) Chain Oil Capacity: 270 cc (9.13 oz) Oilomatic® Chain: .325 RM3 Guide Bar Lengths (Recommended Ranges): 40 to 50 cm (16" to 20")STIHL ROLLOMATIC® E Power Source: Gas NOTES:STIHL recommends #3634 (26 RM3 67) OILOMATIC® Saw chain and 16" 3003 008 6813 Ematic™ guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
