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- MS 661 C-M Chainsaw
MS 661 C-M Chainsaw
Extremely powerful 5.4kW professional saw
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.
You can find videos showing you how to fill your machine with fuel and oil, fit bars and chains and start your chainsaw here.
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Technical data↓
Technical data Value Displacement cm³ 91.1 Power output kW/bhp 5.4/7.3 Weight kg 1) 7.4-7.5 Power-to-weight ratio kg/kW 1.4 System weight kg 2) 9.22 / 10.28 CO2 g/kWh 711 Sound pressure level dB(A) 3) 105 STIHL Oilomatic saw chain pitch/type 3/8" RS Sound power level dB(A) 3) 118 Vibration values left/right m/s² 4) 6.9/5.6 Tank volume l 0.85 Speed at maximum power Um 9,500 Bumper spike Steel claw Sprocket - number of teeth 7.7 Z Cylinder Chrome Oil pump Adjustable Filter HD2 filter Sprocket Chain sprocket,Ring sprocket Chain tensioning Lateral chain tensioning,Side chain tension Anti vibration system Standard AV-System Handle type Standard grip Filler cap Tool free filler cap Chain pitch 3/8" EPA Certified fuel consumption glh 0,751 EPA Certified fuel consumption l/h 2,841 Oil tank volume cm3 400 1) Without fuel, without bar and chain
2) Unfueled, with guide bar and saw chain
3) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
4) K-factor according to DIR 2006/42/EC = 2m / s ²
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Features↓
Standard features
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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.
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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.
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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.
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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.
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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%.
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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.
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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.
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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.
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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.
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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.
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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%.
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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.
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Tool free filler caps
Special catches on the fuel and oil tanks for easy opening and locking without the need for tools.
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Cutting Attachments↓
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Rollomatic ES Light
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 Price Rollomatic ES Light, 3/8", 1,6 mm, 71 cm / 28" (MS 500i and MS 661 only) £128.00* Save and compare Save and compare -
Rollomatic ES
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 Rollomatic ES, 3/8", 1.6 mm, 75 cm / 30" (MS 500i and MS 661 only) £131.00* Save and compare Save and compare -
Rollomatic ES
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 Rollomatic ES, 3/8", 1.6 mm, 90 cm / 36"(MS 661 only) £152.00* Save and compare Save and compare -
Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Versions Price Rapid Super (RS) 3/8", 1.6 mm, 91 drive links, 71 cm / 28" (MS 500i and MS 661 only) £50.00* Save and compare Save and compare -
Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Versions Price Rapid Super (RS) 3/8", 1.6 mm, 98 drive links, 75 cm / 30" (MS 500i and MS 661 only) £55.50* Save and compare Save and compare -
Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Versions Price Rapid Super (RS) 3/8", 1.6 mm, 114 drive links, 90 cm / 36" (MS 661 only) £65.00* Save and compare Save and compare
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Accessories↓
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MotoMix
STIHL MotoMix is our patented premixed fuel, specially blended for ultimate performance. This 50:1 mixture is a combination of premium non-ethanol, high-octane motor fuel and our highest quality STIHL HP Ultra oil. It also stays fresh in your equipment over extended storage periods.
Shelf life Years up to 5 Versions Price MotoMix 5 l £20.00* Save and compare Save and compare -
ForestPlus chain oil
Based on high-quality mineral oils, ForestPlus is suitable for use with all chainsaws, including harvesters. ForestPlus delivers reliable chain lubrication and no resin build up, even during prolonged down times.
Versions Price ForestPlus chain oil - 5 l £17.70* Save and compare Save and compare -
HP Ultra 2-stroke engine oil
Fully synthetic oil with exceptional lubrication properties. Burns with extremely low residue due to ash-free additive. Suitable for continuous use under the most demanding engine conditions. Performance class: JASO-FB, ISO-L-EGB. Fuel/oil ratio 50:1. Recommended for STIHL 4-MIX engines.
Versions Price HP Ultra 2-stroke oil - 1 l (for 50 l) metering bottle £26.50* Save and compare Save and compare -
Varioclean special cleaner
Water based, alkaline detergent specifically for dissolving and removing organic oil residues and for cleaning air filters and housings. The detergent is biodegradable. Avoid contact with the eyes and keep out of reach of children.
Versions Price Varioclean special cleaner, 500ml £9.90* Save and compare Save and compare
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Documents↓
Owners manuals
* Manufacturer's recommended retail price updated as of February 2021. 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.