MS 661 C-M - $1,219.95 DSRP


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A professional chainsaw with enhanced fuel efficiency and STIHL M-Tronic™ technology.

Featuring an impressive power-to-weight ratio and STIHL M-Tronic™ engine management technology, the MS 661 C-M is a professional chainsaw designed for felling large diameter trees. With less vibration and 20% greater fuel efficiency than the MS 660, this saw also features a long-life filter system using HD-2 filter elements to provide longer run times between maintenance, an ElastoStart™ handle an...Read More
Print Spec Sheets
MS 661 C-M Specifications
DISPLACEMENT 91.1 cc (5.56 cu. in.)
ENGINE POWER 5.4 kW (7.2 bhp)
POWERHEAD WEIGHT Flush-Cut: 7.4kg (16.3 lbs.)
Wrap-Handle: 7.66 kg (16.8 lbs.)
FUEL CAPACITY 825 cc (27.9 oz.)
CHAIN OIL CAPACITY 360 cc (12.2 oz.)
GUIDE BAR LENGTHS (Recommended ranges) 40 to 80 cm (16" to 32")
STIHL recommends #3624 (33 RS3 84) OILOMATIC® saw chain and 25" 3003 000 4030 Ematic™ guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Model Features
  • Zoom
    Reduced-Emission Engine Technology - Caring for Nature
    The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.

    More Information

  • Zoom
    STIHL M-Tronic™ 
    This product features M-Tronic™ (M) - a new generation of Intelligent Engine Management that eliminates the low and high speed carburetor adjustment screws, compensates for dirty air filter and changes in elevation and fuel quality for optimum engine power at all times.

    See it in action!

    More Information

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    Decompression Valve
    The decompression valve, also referred to as 'deco' or 'deco valve', vents compression in the cylinder for easier starting. The decompression valve temporarily reduces the compression in the combustion chamber during cranking and helps reduce the effort needed to pull the starter rope. It is opened manually and closes automatically as soon as the engine fires.
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    STIHL ElastoStart™
    The ElastoStart™ starter handle is an exclusive feature of STIHL. It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord. The ElastoStart™ starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking. The forces which occur at the grip after the first compression stroke are smoothed out.
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    Adjustable Automatic Oiler
    The Adjustable Automatic Oiler allows the user to adjust the lubricant of the guide bar and saw chain for different bar lengths and cutting conditions.
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    Toolless fuel and oil caps with retainers
    Simply lift the lever and twist the caps to remove or tighten. There‘s no need to use a tool to tighten or loosen.
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    Side-Access Chain Tensioner
    The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.
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    Anti-Vibration System
    STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
Standard Features
  • Zoom
    Common Features for Chainsaws
    View the features common to many STIHL chainsaws.

Important Information
WARNING! The occurrence called “kickback” can cause serious or fatal injury. Always read the instruction manual carefully before using your saw. STIHL uses a green and yellow color-coding system to help you select a powerhead, bar and chain combination that complies with the kickback requirements of ANSI Standard B175.1 (gasoline-powered saws) and §30 of UL 1662/ ANSI Standard B175.1 (electric chainsaws). Ask your STIHL dealer about safe operating procedures and the advantages of the STIHL Quickstop® chain brake, STIHL Quickstop® Plus (Q) additional chain braking feature, STIHL reduced kickback bars and STIHL low-kickback saw chains.

STIHL recommends the use of green reduced kickback bars and green low kickback chains on all STIHL chainsaws.
* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Click to view the STIHL Limited Warranty Time Periods
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    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

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    Bar and Chain Oil
    STIHL Bar and Chain oil is formulated to adhere to the bar and chain, and to reduce wear. Special agents in the oil formulation help keep sap and pitch from clinging to the bar and chain.

    Available in quart and gallon bottles, 5 gallon pails and 55 gallon drums, in both summer and winter weights.

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    Kits available for the following chain types: STIHL PICCO Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
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    Chain Pitch File Diameter File Guide
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    Sharpening Kit
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    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

    5605 007 1026

    3/8 PM
    5/32 4.0 0811 411 8091

    5605 750 4327

    5605 007 1027

    0.325 8.25 3/16 4.8 0811 412 8088

    5605 750 4328

    5605 007 1028

    3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329

    5605 007 1029

    0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330

    5605 007 1030

For Your Safety
  • Pro Mark™ Hi-Vis Zip Chaps - 9 Layer Zoom
    Pro Mark™ Hi-Vis Zip Chaps - 9 Layer

    If you are a tree care or emergency service professional working along roadways, we recommend the Pro Mark™ Hi-Vis Zip Chaps - 9 Layer. They combine full wrap-around lower leg protection with high-visibility nylon fabric that meets Class E reflective requirements and earns a Class 3 reflective rating when worn with the Class 2 reflective vest. The chaps also feature reflective tapes made from Reflexite Brilliance Series GP-340, making them visible by motorists traveling up to 50 mph. Inside, there are nine layers of Avertic™ Pro by Engtex® cut retardant material, helping reduce the risk or severity of injury in the event of contact with a rotating saw chain on a gasoline-powered chainsaw. Rows of heavy-duty zippers run along the entire inseam of the chaps, helping to ensure they are an effective fit and are easy to put on and/or remove. Stop by our showroom today and check out these versatile chaps.

  • Pro Mark™ Forestry Helmet System Zoom
    Pro Mark™ Forestry Helmet System
    The STIHL Pro Mark™ Forestry Helmet System is a premium quality product, designed with NRR 25 hearing protection and adjustable ratchet-style six-point suspension.
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    Deputy Glasses

    Tough protection that also looks the part. The STIHL Deputy Glasses meet ANSI standard Z87.1+ and feature both protection and style. The lenses are a scratch-resistant polycarbonate that block out 99% of the sun’s harmful UV rays. They are also comfortable to wear, featuring a soft rubber nosepiece and dual-mold rubber temples that helps to keep the glasses in place when the head is in motion. Stop by our Dealership to check out these and other great protective eyewear styles. Shown in Brown Frame / Brown Mirror Lens. Available lens colors (Black Frame): Blue Mirror, Smoke (Brown Frame): Brown Mirror

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    STIHL Pro Mark™ Dynamic Protective Gloves
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Are You Ready for a STIHL?

MS 661 C-M is rated 4.6 out of 5 by 63.
Rated 5 out of 5 by from Great Power Needed a saw that could handle large trees. I bought my MS 661 with a 28" bar and I am running a skip chain. The large oaks I am cutting are larger than that. Even with the full bar engaged, it ripped through the wood! The power never failed. I love it! It is heavy but you can't have that power without the weight. You understand that when you need big power so I do not consider this a negative.
Date published: 2018-03-14
Rated 1 out of 5 by from Worst saw I've ever used. Only worked once out of the four times I took it out. I will not buy another Stihl again.
Date published: 2018-03-10
Rated 5 out of 5 by from A absolutely great professional grade saw. The most reliable, powerful, sturdy, comfortable saw I've ever used.
Date published: 2018-03-07
Rated 5 out of 5 by from best saw i have ever owned Best saw I have ever owned starts easy and will cut any size timber you have, great value
Date published: 2018-03-01
Rated 5 out of 5 by from Power to Weight Ratio & Cost I don't write reviews until I've worked a tool for a few months. I work a couple of hardwood tree farms and some smaller wood lots and have found the MS-661 C-M a very dependable and capable saw for moderate tree size. I carry a 36" bar and cut red and white oak along with sugar maple and ash mostly. The saw has very good power and good balance with very low vibration. It starts easily after refills and after it has be sitting for a couple of weeks, any longer I usually run it empty and then store it. This saw loves moderate size 3 to 4 ft. diameter hard wood just keep a sharp chain on it and let it do the work. I hope it lasts as long as my 044 has. For a saw of its size it really doesn't fatigue you to use it like some other saws of comparable size. Even the noise is much less than one would expect from a 5.5+ cu. in. saw.
Date published: 2018-02-18
Rated 5 out of 5 by from great saw for felling timber I love this saw,as an owner of the ms880magnum, 201t,and a ht131 pole saw and a backpack blower ,I knew the quality would be great,but man this saw cuts like a dream.everyone should do themselves a favor and buy a ms661.cant wait to get back in the woods.
Date published: 2018-02-16
Rated 5 out of 5 by from Absolutely love this saw Hi contemplated and researched saws for a few weeks. It finally came down to the 461 or the 661 CM. The 661 CM won and became a no brainer decision when I found it was on sale and not much difference in price. Took it out last weekend and cut up some 20" maple and it was like butter. Very pleased with the performance. Picking up the 36" light bar on Wednesday and plan to dig into a 4' tree on the weekend. Very pleased with the performance. I was a little nervous about the weight. However, this is how I came to my decision. I have a smaller saw with a 16" blade. I'll use this for limbing and smaller trees. I have the 24" and 36" bars for the 661 and it giving me choice. Because I'm only using the 661 for larger jobs weight isn't really a factor as I'm not twisting the saw around. Besides you just lay it down on the logs and it tears through it. ;)
Date published: 2018-02-05
Rated 5 out of 5 by from This saw has great power and antivibe Excellent saw powerful,reliable,durable, and very well built can be a little hard to start under heavy work loads
Date published: 2018-01-29
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