Description PRODUCT DETAIL:ADJUSTABLE AUTOMATIC OILER: The Adjustable Automatic Oiler allows the user to adjust the lubricant of the guide bar and saw chain for different bar lengths and cutting conditions. 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. THE ELASTOSTARTâ¢: The ElastoStartâ¢ starter handle is an exclusive feature of STIHL. It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord. The ElastoStartâ¢ starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking. The forces which occur at the grip after the first compression stroke are smoothed out. STIHL M-TRONICâ¢ : This product features M-Tronicâ¢ (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. FUEL AND OIL CAPS WITH RETAINERS: The fuel and oil cap retainers keep the caps attached to the unit for added convenience. PRE-SEPARATION AIR FILTRATION SYSTEM: This time-saving technology boosts the efficiency of the engineâs 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. STIHL QUICKSTOPÂ: STIHL chainsaws are equipped with a chain stopping system designed to reduce the risk of injury in certain kickback situations. It is called a STIHL QuickstopÂ chain brake. The STIHL QuickstopÂ chain brake is designed to stop the rotation of the chain if activated by the operatorâs hand or by inertia if the saw kicks back with sufficient force. In some working positions, the STIHL QuickstopÂ chain brake can be activated by inertia, stopping the chain within fractions of a second. EMATICâ¢ LUBRICATION SYSTEM: The Ematicâ¢ guide bar, when used with STIHL OILOMATICÂ saw chain, will provide proper lubrication and less oil consumption than conventional methods. The system works because two ramps, strategically placed in the guide bar rail, help contain the flow of oil and direct all lubrication to the sliding faces of the bar and chain links as well as the rivets and driver holes, which in turn can reduce bar oil consumption up to 50%. MASTER CONTROL LEVERâ¢: The Master Control Leverâ¢ is an easy to use single lever, operating the choke, starting throttle lock and on-off switch. The operator must pull the throttle trigger before moving the Master Control Leverâ¢ to the choke position. 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. WINTER / SUMMER SHUTTER: The Winter/Summer Shutter allows the carburetor to operate at optimum temperature year-round and helps to prevent carburetor icing when working below 50ÂF (10ÂC). MAGNESIUM ALLOY PISTON: The magnesium alloy piston is lighter in weight than equivalent size aluminum alloy pistons. EXCELLENT POWER-TO-WEIGHT RATIO (12.8 LBS. / 5.4 BHP): Thanks to innovative engineering and construction, the MS 400 C-M delivers an excellent power-to-weight ratio. MODERN DESIGN: The modern design of the MS 400 C-M is an aesthetic reflection of the power and innovation this saw delivers. LIGHTWEIGHT (12.8 LBS.): The MS 400 C-M professional chainsaw is designed to deliver lightweight performance and jobsite productivity.