Product Information The STIHL MS 661 C-M chain saw is equipped with cutting-edge technologies for outstanding performance. Weighing in at just 7.4 kg and with an impressive output of 5.4 kW, it boasts a low-power-to-weight ratio and is the lightest chain saw in its engine displacement class. It's not just power that counts when you're harvesting large timers, but also every gram of weight. The extra powerful and efficient 2-MIX engine allows you to work effectively, thanks to its high cutting performance and low emissions. This very powerful high-performance also features M-Tronic electronic engine management which uses a microchip to control the engine’s ignition timing and fuel supply, taking into account such variables as temperature and fuel quality. Designed for professional use within forestry and big timber harvesting.

Key Features

* STIHL 2-MIX-Engine with 1-in-4 channel technology features a high torque over a wide speed range. The chainsaw provides fuel savings of up to 20% compared to STIHL two-stroke engines in the same performance class without 2-MIX technology. Exhaust emissions are reduced by up to 50% * STIHL M-Tronic - electronic engine management system adjusts ignition timing and fuel metering in all operating modes. It also takes external conditions such as temperature, altitude and fuel quality into account. It ensures consistent engine performance, a constant maximum speed and superb acceleration. M-Tronic makes manual carburettor adjustments unnecessary. Thanks to electronic cold/warm start recognition, now there is only one start position on the combi-lever. The engine starts after fewer pulls and with no change of position, and can immediately accelerate up to speed - even after a cold start. M-Tronic also remembers the settings from the last time the tool was used. So when external conditions are the same, optimal engine performance is available every time you start up again * HD2 filter - is made from polyethylene filter material with up to 70% finer pores than fleece and polyamide filters to trap even very fine dust. In addition, it is oil and water-repellent and thus very easy to clean. The PET-covered filter cartridge with quick-release lock enables the filter to be assembled and disassembled in next to no time, without using tools * Combi lever - only one start position is needed on the combi lever. The exact amount of fuel is supplied on demand * Captive nuts - MS 261 is the first STIHL chainsaw to be equipped with the captive nuts * Anti-vibration system - the oscillations from the machine's engine are dampened which significantly reduces vibrations at the handles * STIHL ElastoStart - reduces the shock caused by the compression of the engine during starting * Tool free filler cap - special catches on the fuel and oil tanks for easy opening and locking without the need for tools * Decompression valve - is part of the easy starting system * Compensator - 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 * 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 by up to 50% * Side chain tensioner - the tensioning screw can be found on the side of the chain saw through the sprocket cover. This removes the need for contact with the sharp saw chain * Variable-displacement oil pump - allows a precise, demand-based delivery of oil. It's possible to reduce oil production by up to 50% in the E position * Lower power-to-weight ratio * Double bumper spikes * Models with additional features – heated handles