MS 661 C-M - Extremely powerful 5.4kW professional saw with STIHL M-Tronic (M)
Selection Petrol chainsaws for forestry work

MS 661 C-M

Extremely powerful 5.4kW professional saw with STIHL M-Tronic (M)

General

MS 661 C-M

Very powerful high-performance saw with advanced 2-MIX technology and STIHL M-Tronic (M). This electronic engine management system regulates the ignition timing and the fuel supply and automatically registers the external temperature for optimal engine performance, great acceleration and sustained maximum torque. Extremely robust and durable with low vibration levels. Designed for professional use within forestry and big timber harvesting. Supplied with rollomatic E guide bar, not rollomatic ES light as pictured.

Versions

Price

* Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Technical data

MS 661 C-M

Technical data

Displacement cm³ 91.1
Power output kW/bhp 5.4/7.3
Power-to-weight ratio kg/kW 1.4
Weight kg 1) 7.4
Sound pressure level dB(A) 2) 105
Sound power level dB(A) 2) 118
Vibration values left/right m/s² 3) 6.9/5.6
STIHL Oilomatic saw chain pitch/type 3/8" RS
Chain brake QuickStop
Oil tank volume cm3 400
Tank volume l 0.85

1) Without fuel, without bar and chain
2) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
3) K-factor according to DIR 2006/42/EC = 2m / s ²

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Features

MS 661 C-M

Standard features

  • Decompression valve Zoom
    Decompression valve

    The decompression valve is part of the easy starting system. The valve should be pressed before starting to reduce the compression pressure when starting, as well as reducing the effort needed to pull the starter rope. The decompression valve is semi-automatic; it must be pressed manually before starting, but then closes automatically.

  • Combi lever Zoom
    Combi lever

    As M-Tronic has electronic cold and warm start recognition, only one start position is needed on the combi lever. The exact amount of fuel is supplied on demand. You do not need to know about the status of your chainsaw and can apply full throttle straight away - even with a cold start. Because the saw is warmed up by optimum acceleration in a few seconds.

  • STIHL M-Tronic (M) Zoom
    STIHL M-Tronic (M)

    This fully 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 Zoom
    HD2 filter

    The 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.

  • Anti-vibration system Zoom
    Anti-vibration system

    Intense vibration at the handles of power tools can lead to long-term effects on blood vessels in the hands and arms. STIHL has therefore developed an effective anti-vibration system whereby the oscillations from the machine's engine are dampened which significantly reduces vibrations at the handles.

  • STIHL 2-MIX-Engine Zoom
    STIHL 2-MIX-Engine

    1-in-4 channel technology. The economical STIHL 2-MIX engine with 1-in-4channel 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%.

  • Compensator Zoom
    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.

  • Captive nuts Zoom
    Captive nuts

    When changing the cutting attachment, you will not risk losing the nuts on the sprocket. The MS 261 is the first STIHL chainsaw to be equipped with the captive nuts. A great advantage for all users.

  • Variable-displacement oil pump Zoom
    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. For very long cutting attachments or very dry wood, an additional volume of oil can be added by the user. similar to illustration.

  • Side chain tensioner Zoom
    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.

  • Ematic chain lubrication system Zoom
    Ematic chain lubrication system

    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 by up to 50%.

  • STIHL ElastoStart Zoom
    STIHL ElastoStart

    STIHL ElastoStart reduces the shock caused by the compression of the engine during starting. The compression shock is taken away from the user's joints and muscles through a spring or rubber element in the starter handle.

  • Tool free filler caps Zoom
    Tool free filler caps

    Special catches on the fuel and oil tanks for easy opening and locking without the need for tools.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Accessories

MS 661 C-M

Accessories

    • Rollomatic ES 3/8 Zoom
      Rollomatic ES 3/8" (11 teeth)

      The STIHL Rollomatic ES (STIHL Ematic Super) is composed of a solid and particuarly rigid bar with a bar nose which can be replaced entirely. It is therefore ideal for most demanding professional tasks and is used chiefly on heavy duty machines for felling and bucking. Elliptically fomed, angled oil holes increase the flow speed of the chain oil, delivering optimal lubrication and even longer service life for the guide bar.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rollomatic ES 3/8 Zoom
      Rollomatic ES 3/8" (11 teeth)

      The STIHL Rollomatic ES (STIHL Ematic Super) is composed of a solid and particuarly rigid bar with a bar nose which can be replaced entirely. It is therefore ideal for most demanding professional tasks and is used chiefly on heavy duty machines for felling and bucking. Elliptically fomed, angled oil holes increase the flow speed of the chain oil, delivering optimal lubrication and even longer service life for the guide bar.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rollomatic ES 3/8 Zoom
      Rollomatic ES 3/8" (11 teeth)

      The STIHL Rollomatic ES (STIHL Ematic Super) is composed of a solid and particuarly rigid bar with a bar nose which can be replaced entirely. It is therefore ideal for most demanding professional tasks and is used chiefly on heavy duty machines for felling and bucking. Elliptically fomed, angled oil holes increase the flow speed of the chain oil, delivering optimal lubrication and even longer service life for the guide bar.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rollomatic ES 3/8 Zoom
      Rollomatic ES 3/8" (11 teeth)

      The STIHL Rollomatic ES (STIHL Ematic Super) is composed of a solid and particuarly rigid bar with a bar nose which can be replaced entirely. It is therefore ideal for most demanding professional tasks and is used chiefly on heavy duty machines for felling and bucking. Elliptically fomed, angled oil holes increase the flow speed of the chain oil, delivering optimal lubrication and even longer service life for the guide bar.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Super (RS), 3/8 Zoom
      Rapid Super (RS), 3/8" 1.6 mm

      High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.

    Technical data
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Super (RS), 3/8 Zoom
      Rapid Super (RS), 3/8" 1.6 mm

      High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.

    Technical data
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Super (RS), 3/8 Zoom
      Rapid Super (RS), 3/8" 1.6 mm

      High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.

    Technical data
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Super (RS), 3/8 Zoom
      Rapid Super (RS), 3/8" 1.6 mm

      High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.

    Technical data
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Super (RS), 3/8 Zoom
      Rapid Super (RS), 3/8" 1.6 mm

      High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.

    Technical data
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • Filing kit Zoom
      Filing kit

      Includes file holder with round file, flat file and file gauge in a sturdy case.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • 2-in-1 EasyFile Zoom
      2-in-1 EasyFile

      Practical tool for quickly sharpening the teeth and depth gauge in a single action, significantly reducing chain maintenance time. The sturdy frame allows for a smooth filing action with highly accurate results. All the files are easily replaceable. For 1/4" P, 3/8" P, .325", 3/8" and .404" saw chains. Includes round and flat files.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

    • EXTREME helmet set with V5 visor system Zoom
      EXTREME helmet set with V5 visor system

      Upgraded helmet set with adjustable ratchet and V5 visor system. Three-zone visor with very high light penetration. With UV indicator. EN 352, EN 397, EN 1731.

    Technical data
    Ear protection SNR 28 (H:35. M:26.L:18)
    Sound level 108 dBA
    Helmet material ABS (G 3.000)
    Inner fittings 4-Point
    Light penetration 60-70-80 %
    Weight 650 g

    Versions

    Price

    * Manufacturer's recommended retail price updated as of February 2018 The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Documents

Owners manuals and safety brochures

STIHL MS 661 C-M (GB) Download PDF, 2.8 MB

Notes:

  • STIHL and VIKING online owner’s manuals are usually for the latest versions of the machine. Your product may be a slightly older production model but the manual will still be appropriate for the relevant model number.
  • The languages ​​contained in the document are also displayed in brackets, for example (GB) = English.

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