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.)
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 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

  • 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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    •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™ Hi-Vis Zip Chap Zoom
    Pro Mark™ Hi-Vis Zip Chap

    If you are a tree care or emergency service professional working along roadways, we recommend the Pro Mark™ Hi-Vis Zip Chaps. 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.
  • 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

  • STIHL Pro Mark™ Dynamic Protective Gloves Zoom
    STIHL Pro Mark™ Dynamic Protective Gloves
    Durable and hardworking, STIHL Pro Mark™ Dynamic Gloves deliver professional-grade hand protection. The palm and inner fingers are made of full grain tanned leather, so you can work with comfort without sacrificing a firm hold. Featuring multiple layers of cut-retardant materials – Avertic® Pro and Dyneema fabrics by Engtex® – these gloves will help deliver protection without compromising the dexterity you need while operating a chainsaw. Accented with an orange rip-stop nylon backing, these dynamic gloves offer style and protection. Water repellant, breathable and featuring a Velcro wrist closure, STIHL Pro Mark™ Dynamic Gloves are as ready for the woods as you.

Are You Ready for a STIHL?

MS 661 C-M is rated 4.6 out of 5 by 55.
Rated 5 out of 5 by from Great antivibe Just bought this saw a few months ago and absolutely love it. From what I've seen they had a few problems when they first came out, but it seems they have solved the issues. The most notable feature for me is the antivibe system. I've been running an 044 for years, and once I ran this saw I was in love. Smooth as silk. I was a little nervous about the M-tronic, but I love the way it runs and after watching a video that showed a breakdown of it, I see how simple it actually is. I can see how it is actually better than a standard carb. I needed a saw with more power and this has delivered beyond expectations. I must say for the size of this saw the weight is really quite manageable.
Date published: 2018-01-09
Rated 5 out of 5 by from Amazing Piece of Equipment. Purchased the 661 thinking it would be a neutered 660 to fit in with our changing times and EPA Regulations etc. I was wrong this saw has in many situations outperformed my 660's and 066. I do NOT do out of the box reviews so I waited 2 months to voice my opinion. This thing is a beast and very reliable! Running a 32" Bar and Chain to tackle Bur Oak's and Catalpa's. Stihl hit one out of the park in my opinion with the "Improved 660". I run alcohol free gasoline so I watch my fuel costs and have noticed it is more efficient. For a lack of better terms I get better fuel mileage with the 661. So if you need Artillery for back up on tough jobs here it is.
Date published: 2018-01-07
Rated 5 out of 5 by from True powerhouse tool A serious saw for the real tough jobs. Starts easily and has an enormous amount of power. The M-Tronic system has been flawless so far. The saw is a bit heavy but the saw does all the work. You will not notice the weight on the tough cutting tasks. Very happy with the purchase.
Date published: 2017-12-25
Rated 5 out of 5 by from Worth every penny To everyone who has complained about not starting when hot there's no need for choking it hit the decompression button and one pull it up and running. As far as the nuts coming loose I have never had a problem as far as I am concerned it's a great saw the best money can buy and if you take care of it it will never do you wrong, and respect it its not a toy very powerful a little bit on the heavy side but not bad
Date published: 2017-12-16
Rated 4 out of 5 by from Great saw, some issues Overall this saw is a beast! With great balance and aggressive cuts. Problems with starting it back up during heavy work load, waiting 10 to 15 min for it to cool down is annoying!!!! I like the mc441 more lighter not much difference in power. No down time.
Date published: 2017-12-15
Rated 5 out of 5 by from So far so good I have to say with all the reviews I have read I was a bit skeptical about this product. I must say with the 25” or 30” I am impressed!!! I have cut around 40 trees so far and it has not slowed down. I cut around 50 rick a year and needed a reliable saw, don’t be afraid to give this one a try.
Date published: 2017-11-09
Rated 5 out of 5 by from Built Alaska Tough! I bought this saw two years ago and have used it extensively to cut old growth hemlock and sitka spruce on my land. This saw handles the big stuff like none other. I have put countless of hours on this saw under some extreme conditions and it never misses a beat! Plenty of power to cut through the biggest logs with total ease! Best investment I've made in a long time. This saw has made my life much easier!
Date published: 2017-11-08
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
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