Direct product selection: Petrol chainsaws for forestry

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.

Versions



Deviations from the product range and information provided here are possible, depending on the country. VIKING reserves the right to make changes to technical specifications and equipment.

Product versions

  • MS 661 C-M W Extremely powerful 5.4 kW professional saw with STIHL M-Tronic (M) and heated handles (W)

Technical specifications

MS 661 C-M

Technical specifications

Displacement 91,1 cm³
Power output 5,4/7,3 kW/bhp
Weight 1) 7,4 kg
Power-to-weight ratio 1,4 kg/kW
Sound pressure level 2) 105 dB(A)
Sound power level 2) 118 dB(A)
Vibration level left/right 3) 6,9/5,6 m/s²
Saw chain pitch 3/8"
STIHL Oilomatic saw chain type Rapid Super (RS)

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

Deviations from the product range and information provided here are possible, depending on the country. VIKING reserves the right to make changes to technical specifications and equipment.

Features

MS 661 C-M

Standard equipment

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

    For a cold start, the STIHL M-Tronic only needs one start position on the combi-lever. After starting, you can immediately power up to full speed. The amount of fuel required is precisely calculated by the system and supplied as needed. Otherwise, start in position I as usual.

  • STIHL ElastoStart Zoom
    STIHL ElastoStart

    Due to compression pressure, jerky stresses occur when starting internal combustion engines. The damping element in the ElastoStart special starter grip alternately absorbs and releases force according to the compression pattern. The result is smooth, even starting.

  • STIHL 2-MIX engine Zoom
    STIHL 2-MIX engine

    The two-stroke engine with STIHL 2-MIX technology saves up to 20 % of fuel and reduces emissions by up to 70 % compared to STIHL 2-stroke engines of the same performance class without 2-MIX technology.

  • Carburettor heating (V) Zoom
    Carburettor heating (V)

    By changing the chain saw from summer to winter operation, the intake air is pre-heated over the engine fins. This ensures that the carburettor does not ice up and you can continue working in freezing temperatures.

  • Controlled-delivery oil pump Zoom
    Controlled-delivery oil pump

    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.

  • Side-mounted chain tensioning Zoom
    Side-mounted chain tensioning

    Side-mounted chain tensioning makes it easy to tension the chain safely.

  • HD2 filter Zoom
    HD2 filter

    This air filter keeps even the finest dust away from the engine, ensuring a particularly long service life. Thanks to its special material, the filter can easily be cleaned by washing, for example with STIHL Varioclean and warm water.

  • 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.

  • 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.

  • STIHL anti-vibration system Zoom
    STIHL anti-vibration system

    Precisely calculated buffer zones minimise the transfer of engine and saw chain vibrations to the front and rear handles. The chainsaw therefore runs noticeably smoother. This allows the user to save their strength and work longer.

  • STIHL Ematic System Zoom
    STIHL Ematic System

    Compared to conventional bars without Ematic, the STIHL Ematic system reduces the consumption of chain lubricant by up to 50 %, depending on the type of wood and the cutting attachment used. This system comprises a STIHL Ematic or Ematic S guide bar, a STIHL Oilomatic saw chain and a variable-flow or reduced-flow oil pump. As a result, virtually every drop of chain lubricant is delivered to exactly the right spot.

  • 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.

  • 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.

  • Tool free fuel caps Zoom
    Tool free fuel caps

    Special caps to open and close the tank cap quickly, easily and without tools.

Deviations from the product range and information provided here are possible, depending on the country. VIKING reserves the right to make changes to technical specifications and equipment.

Accessories

MS 661 C-M

Accessories

    • Rollomatic ES Light, 3/8 Zoom
      Rollomatic ES Light, 3/8", 1,6 mm

      Lightweight version of the STIHL Rollomatic ES, made from hard-wearing special steel. The hollow centre is cut out and then welded using a special laser process. This produces an extremely stable hollow body with a flexible outer and substructure. The result is a weight saving of some 30% compared with Rollomatic ES guide bars.

    Versions

    • Filing kit Zoom
      Filing kit

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

    Versions

    • 2-in-1 file holder Zoom
      2-in-1 file holder

      Practical tool for quickly sharpening the teeth and depth gauge in a single step. Ideal for occasional users. For 1/4" P, 3/8" P, .325", 3/8" and .404" saw chains, integrated file tolerance compensation (only from STIHL).

    Versions

    • DYNAMIC Protect MS Zoom
      DYNAMIC Protect MS

      Made from cow hide leather, STIHL DYNAMIC Protect MS work gloves have an ergonomic curved design for better grip, higher comfort and reduced fatigue. An elastic cuff supports the wrist and prevents dirt or chips from entering the glove. Cut protection level Class 1.

    Technical specifications
    Cut protection class Class 1
    Elasticated or fitted cuffs Yes
    Lined Yes
    Waterproof nein

    Versions

    • 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.

    Versions

    • ADVANCE GTX trekking chainsaw boots Zoom
      ADVANCE GTX trekking chainsaw boots

      Special profile sole with very good grip. High quality, water-repellent suede. With breathable and waterproof GORE-TEX® membrane. Additional water and wear protection provided by high-rise rubber edge. Highly absorbent, removable inner sole. Suitable for demanding, professional chainsaw users on hillsides and for tree maintenance. EN ISO 17249, cut resistance Class 2 (= 24 m/s).

    Versions

    • Combination socket tool Zoom
      Combination socket tool

      For tensioning the chain and changing the chain, bar and spark plug. Width across flats: 19 (for MS 261 up), 19-13 (for MS 271, MS, 291, MS 311, MS 391), 19–16 (for MS 170, MS 171, MS 180, MS 181, MS 193 C, MS 211, MS 231, MS 241, MS 251), 16 and 13 ( for MS 150, MS 201, MS 201 T).

    Versions

    • Multi-function tool Zoom
      Multi-function tool

      Practical, multi-function quality tool in a sturdy plastic case. 3.5 mm flat-blade screwdriver for carburettor adjustment and cleaning grooves, Torx® TX 27 screwdriver, nylon pouch with belt loop. Width across flats 19-13 for MS 271, MS 291, MS 311 and MS 391, width across flats 19-16 for MS 170, MS 171, MS 180, MS 181, MS 193 C, MS 211, MS 231, MS 241 and MS 251.

    Versions

    • Holder 1144 for STIHL Laser 2-in-1 Zoom
      Holder 1144 for STIHL Laser 2-in-1

      For MS 661 C-M, all design variants

    Versions

    • STIHL Laser 2-in-1 Zoom
      STIHL Laser 2-in-1

      Felling direction indicator and cutting guide in one. For cutting short pieces of wood without complicated measuring, can be used as a felling direction indicator to check the cuts and felling direction, demonstration video on DVD. Choose the holder suitable for your chain saw.

    Versions

Deviations from the product range and information provided here are possible, depending on the country. VIKING reserves the right to make changes to technical specifications and equipment.

Documents

Owners manuals and safety brochures

Owners manuals

STIHL MS 661 C-M (D) Download PDF, 2,8 MB
STIHL MS 661 C-M (D, F, I) Download PDF, 7,2 MB

Safety brochures

Sicheres Arbeiten mit dem Trennschleifer (D) Download PDF, 1,3 MB
Sicheres Arbeiten mit der Heckenschere (D) Download PDF, 764 KB
Sicheres Arbeiten mit der Motorsäge (D) Download PDF, 1011,7 KB
Sicheres Arbeiten mit einem Reinigungsystem (D) Download PDF, 935,7 KB
Sicheres Arbeiten mit Motorsense und Freischneider (D) Download PDF, 810,1 KB

Notes:

  • STIHL 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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