Official STIHL Importer
Selection Petrol chainsaws for forestry

MS 661 C-M

MS 661 C-M petrol-driven chainsaw: cutting-edge technology for forestry work

General

MS 661 C-M

The competition chainsaw used in the STIHL TIMBERSPORTS® series. Big-timber saw for the toughest jobs in forestry. M-Tronic guarantees optimum engine performance at all times, with its single starting position and stop button function offering easy starting. Controlled-delivery high-performance oil pump for conveying high quantities of oil, HD2 filter with very good filter effect, economical 2-MIX engine.

Versions



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

Technical data

Technical data Value
Displacement cm³ 91,1
STIHL Oilomatic saw chain type 3/8" RS
Power output kW/PS 5,4/7,3
Weight kg 1) 7,4
Power-to-weight ratio kg/kW 1,4
Sound pressure level dB(A) 2) 105
Recommended bar length cm/inch 71 or 75cm/28 or 30"
Sound power level dB(A) 2) 118
Vibration level left/right m/s² 3) 6,9/5,6

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

Standard features

  • STIHL ANTI-VIBRATION SYSTEM Zoom
    STIHL ANTI-VIBRATION SYSTEM

    FOR MORE PLEASANT WORK. Vibrations can occur when you put your power tools through their paces, and these are particularly noticeable in the grip area. The buffer and spring elements of the STIHL anti-vibration system reduce the transmission of engine vibrations to the handle area and therefore to your body. The result is that your power tool is more comfortable to hold and your work is much less tiring.

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

    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.

  • CAPTIVE NUTS Zoom
    CAPTIVE NUTS

    PROTECTION AGAINST LOSS The nuts are attached to the sprocket cover in a captive manner. This makes it impossible for the nuts to fall off and get lost when the cover is removed.

  • MANUAL DECOMPRESSION Zoom
    MANUAL DECOMPRESSION

    EFFORTLESS START-UP. The decompression valve makes it easier to start your power tool. When starting, you can allow some of the compressed mixture to escape from the cylinder by opening the valve. This protects the start-up system and reduces the amount of force required on the starter cord.

  • 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.

  • HD2-FILTER Zoom
    HD2-FILTER

    INCREASES SERVICE LIFE. The HD2 filter protects your power tool’s engine against even the finest dust, ensuring a longer service life and reduced wear. The filter made from PET material has up to 70% finer pores than fleece and polyamide filters, and is also oil- and water-repellent. This also makes it easier to clean the filter. When needed, the filter cartridge can be easily replaced without tools.

  • COMPENSATOR Zoom
    COMPENSATOR

    REDUCED MAINTENANCE. The compensator is a control system in the carburettor, which uses pressure compensation to ensure that engine performance, exhaust gas quality and fuel consumption remain virtually constant over a long period of time, despite increasing contamination of the air filter. You do not need to clean the air filter until there is a noticeable drop in performance. This means that you can work for a long time without maintenance.

  • CONTROLLED-DELIVERY OIL PUMP Zoom
    CONTROLLED-DELIVERY OIL PUMP

    OIL CONSUMPTION BASED ON NEED. The controlled-delivery oil pump reduces your chainsaw’s oil consumption by up to 50%. To use it, simply select the E position. For very long cutting attachments or very dry wood, an additional oil volume can be set by the user.

  • STIHL 2-MIX ENGINE Zoom
    STIHL 2-MIX ENGINE

    HIGHLY POWER-EFFICIENT. With the STIHL 2-MIX engine, you can reduce exhaust emissions and fuel consumption, and therefore operating costs. This 2-stroke engine is low-maintenance and uses fuel efficiently even at high power levels. Use a mixture of petrol and engine oil as fuel. The STIHL 2-MIX engine complies with the strict EU Stage V emissions directive.

  • SIDE-MOUNTED CHAIN TENSIONING Zoom
    SIDE-MOUNTED CHAIN TENSIONING

    FOR SIMPLE AND SECURE RE-TENSIONING. Side-mounted chain tensioning allows for protected, easy and quick chain tensioning and replacement. The tensioning screw is inserted laterally through the sprocket cover.

  • 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.

  • Tool free fuel caps Zoom
    Tool free fuel caps

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

Accessories

    • 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

    • HP Super two-stroke engine oil Zoom
      HP Super two-stroke engine oil

      STIHL HP Super 2-stroke engine oil is a semi-synthetic “low-smoke oil” that has been specially developed for all STIHL 2-stroke engines. It supports very clean and low-smoke combustion in the engine, making work more pleasant for you as a professional or private user.

      STIHL HP Super 2-stroke engine oil ensures good engine lubrication and makes it easier to start your power tool – even at low temperatures. It can be used all year round and supports a long service life for your engines. This engine oil has very good mixing properties.

      STIHL HP Super 2-stroke engine oil is available in the following sizes:

      • 100 ml for 5 litres (item no.: 07813198052)
      • 1 litre for 50 litres (item no.: 07813198053)
      • 1 litre for 50 litres as a dosing bottle (item no.: 07813198054)
      • 5 litres for 250 litres (item no.: 07813198055)
      • 10 litres for 500 litres (item no.: 07813198056)

      Further information:

      • Performance classes: JASO-FD, ISO-L-EGD
      • Mixing ratio: 1:50

    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).

    Technical data Value
    Leg height 20 cm
    Weight 1) 2,5 kg
    Cut protection class Class 2
    Size 39 - 47

    1) Approx per pair, using size 42

    Versions

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.