Green machine: the efficient STIHL 2-MIX engine with 1-in-4 channel technology delivers high torque over a wide rpm range. At the same time, the STIHL MS 661 C-M consumes up to 20%* less fuel and produces as much as 50%* lower emissions.
*Compared to STIHL 2-stroke engines of the same performance class without 2-MIX technology
The M-Tronic fully automatic engine control makes work easier, even for the pros. A microchip controls the engine's ignition timing and fuel supply, taking into account variables such as temperature, fuel quality and elevation. So you no longer need to manually adjust the carburettor, the Chainsaw consumes less fuel and you can count on the best possible engine performance at all times.
Light years ahead: the STIHL MS 661 C-M is the lightest professional-grade Chainsaw in its displacement class. Special components significantly improve the power-to-weight ratio, such as the stainless steel muffler and the Rollomatic ES guide bars.
M-Tronic automatically distinguishes between a cold or warm start, so there is only one start position on the combi-lever. The exact amount of fuel needed for each kind of start-up is provided automatically. So you can power up to full speed straight away, even after a cold start. After the saw is turned off, the control lever immediately moves back into the operating position.
Steady does it: we've developed an innovative new anti-vibration system for an even more controlled and precise cut. It significantly reduces the vibrations felt by the user.
Above average: double bumper spikes ensure great cutting precision during bucking and felling jobs. For better directional control during plunge cutting jobs, raised lines that act as plunge guides have been integrated into the crankshaft design.
The new HD2 air filter made of PET material with a radial seal prevents fine dust from entering the Chainsaw. The hermetic seal increases the engine's service life and reduces wear.
The new oil pump system enables the oil flow to be increased, which is particularly advantageous when working in dusty conditions or when using longer guide bars.
Bar nuts held captive in the sprocket cover will not get lost when changing over the cutting attachment.
The electronic engine management system with memory function regulates the ignition timing and the fuel supply and automatically registers the external temperature, for optimal engine performance, great acceleration and sustained maximum torque. There is only one start position on the combi-lever, so you can easily start the tool with fewer pulls on the cord and without switching.
Intense vibration at the handles of power tools can lead to longer-term effects of blood vessels in the hands and arms. STIHL have therefore developed an effective anti-vibration system where by the oscillations from the machines engine are dampened which significantly reduces vibrations at the handles.
STIHL ElastoStart reduces the shock caused by the compression of the engine during starting. The compression shock is taken away from the users joints and muscles through a spring or rubber element in the starter handle.
Special caps on the fuel and oil tanks are designed for easy opening and locking without the need for tools.
The decompression valve is part of the easy start-system. The valve should be pressed before starting in order to reduce the compression pressure when starting, as well as the effort needed to pull the starter rope. The decompression valve is semi-automatic, meaning that it must be pressed manually before starting, but then closes automatically.
This controller in the carburettor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburettor depending on the quantity of air passing through the air filter. This keeps the fuel/air ratio in the combustion mixture constant and hence also the engine power. The filter doesn't need to be cleaned until an appreciable drop in power occurs.
The Ematic chain lubrication system ensures pinpoint lubrication of the saw chain links and guide bar rails. When used with STIHL OILOMATIC saw chain, it will provide maximum lubrication, longer wear and less oil consumption than conventional methods of chain lubrication. The Ematic system can reduce bar oil consumption up to 50%.
The tensioning screw is located on the side of the chainsaw through the sprocket cover. Chain side tensioning allows the saw chain to be retensioned effortlessly, avoiding any contact with the sharp chain.
Different bar lengths, wood types and sawing techniques require different amounts of oil. The controlled-delivery oil pump allows the user to select just the right amount of oil for the job at hand.
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