MS 661 C-M - $1,209.95 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.)
OILOMATIC® CHAIN 33 RS3
GUIDE BAR LENGTHS* (Recommended ranges) 40 to 80 cm (16" to 32")
STIHL ROLLOMATIC® E Super
POWER SOURCE Gas
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 depending upon which powerhead it is installed.
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

  • Zoom
    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.
  • Zoom
    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.
  • Zoom
    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.
  • Zoom
    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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    HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

    •2.6 oz. bottle makes 1 gallon mix

    •5.2 oz. bottle makes 2 gallon mix

    •6.4 oz. bottle makes 2 1/2 gallon mix

    •12.8 oz. bottle makes 5 gallon mix

    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.

  • Bar and Chain Oil Zoom
    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.

  • Complete Filing Kits Zoom
    Complete Filing Kits
    Kits available for the following chain types: STIHL PICCO Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
    Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.
    Chain Pitch File Diameter File Guide
    Part Number
    Sharpening Kit
    Part Number
    in. mm in. mm Part Number
    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

    5605 007 1026

    1/4
    3/8 PM
    6.35
    9.32
    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™ 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.
  • Deputy Glasses Zoom
    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 99.9% 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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MS 661 C-M is rated 4.5 out of 5 by 48.
Rated 5 out of 5 by from Do not hesitate! I read a bazillion reviews when shopping for a saw for tornado clean up. I chose this saw despite some of the complaints and I am proud to say that I have experienced none of the issues outlined in other reviews. This thing is bad to the bone. We have 100 year old oaks and pines on our property and I haven't ran into one yet that can slow this saw down. It will work all day long without a hiccup. Do not hesitate to buy this saw. Do not worry about it being heavy, it does all the work for you (or you can hit the gym). It will get into a cut and pull right through it. I have never experienced anything like it with any other saw. This is the only way to go!
Date published: 2017-10-17
Rated 5 out of 5 by from This chainsaw has a perfect power to weight ratio. I bought my first stihl saw about 20 years ago.It was the 066 magnum,and it sure did a great job for me. It was used to fell trees and for everyday firewood cutting. I sold this saw due to lack of work. i recently purchased the new MS 661 magnum and WOW is this the saw for me. Plenty of power and very easy to start and surprisingly light weight for its class. This saw will do it all. LOVE MY STIHL. Todd G Robertson.
Date published: 2017-10-11
Rated 5 out of 5 by from Very powerful saw and glad I bought it I needed a 36" bar saw and found the 661 and one other brand's saw. I have a smaller stihl saw so I went with the 661 due to brand awareness. To be honest if it wasn't for this for this specific difficult cut I probably wouldn't have spent so much on a saw but I'm glad I did. The only issue I have had is trying to restart a hot saw but a cleaning of the plug seemed to do the trick. The saw has a huge amount of power and so far I am very happy with it.
Date published: 2017-09-25
Rated 4 out of 5 by from Great Saw This is a great saw for large jobs. It can be a bit heavy after about an hour of use but it can get the job done.I was hoping that it would have just a bit more power than it does, but it still does what I need. Can be a bit tough to start at times.
Date published: 2017-09-20
Rated 3 out of 5 by from chain blade nuts spin off while in use no matter how tightly torqued First of all , I run a tree service and got this saw to cut tree stumps. Plenty of power but blade nuts spin off after about one minute of use. No matter how tight, there's been times I thought I was going to break the stud off. I had to buy nylon self locking nuts to use it. Good luck!
Date published: 2017-09-08
Rated 5 out of 5 by from Nice hefty saw Shy of an 880 for milling or clearing the rainforests - I can't imagine anyone needing a bigger saw. The 661 is a beast. It don't find huge power advantage over the 461, but it's noticeable. Love the MTRONIC. This saw doesn't let down.
Date published: 2017-08-21
Rated 5 out of 5 by from Powerful saw I see a lot of people having a problem with the saw starting after running hot or after running for long periods of time. I found when you re-start any of the saws just pull the cord with out choking or doing anything you would do when cold starting and especially with the mtronics. Usually starts every time one pull because the gas is already there.if you re-choke after running hot, it floods the carburetor causing the no starts.Just pull the cord. Unleash the beast.
Date published: 2017-08-04
Rated 5 out of 5 by from I'm a 3rd generation timberman. Being a Missouri family with German heritage, we have always known what the best saw out there is... Stihl! This saw has made so many advancements, I am very impressed. Have solely operated it for one year now without a hitch, has never shut off when laid down during idle. If you can handle the few extra pounds, the gas tank is larger for fewer fill ups throughout the day, new anti-vibration mounts and springs have really improved kickback vatigue, as well as new air filters. Also, the chain cap cover has nuts that stay in once loosened. Overall, I have not found anything I don't like about the brilliantly engineered advancements that have been developed. Dependability at its finest but hold on, this chainsaw aien't for boys! Way to go Stihl, cheers to taking such pride in the development of this awesome chainsaw.
Date published: 2017-07-28
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