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

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    Pro Mark™ Forestry Helmet System
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    Pro Mark™ Chainsaw Boot
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STIHL Dealer Days are Ending Soon!

MS 661 C-M is rated 4.5 out of 5 by 38.
Rated 5 out of 5 by from Alaskan mill powerhouse I bought this saw to run a 36" Granberg mill through hardwoods. I put a 42" bar with ripping chain on and the mill gives a touch over 33" of cutting width with that set up. The widest I've had a chance to cut has been about 28" over short runs, with sustained cuts out to about 20". With a sharp chain the saw walks through all that without a second thought. I'll be taking down a big maple soon and working the mill at max width all day on it, I'll update my review once I do. My only complaint with this saw is it can be a little finicky to start when it's hot, but we just find clean up tasks to kill 30 minutes and it fires up first or second pull once things have cooled down. That or just hold the throttle wide open rather than using the automatic Start setting. The details on this saw are great too - love the fuel caps, love the easy adjust chain tension, love the embedded bolts on the chain retainer plate so we aren't chasing nuts around a dirty job site. This is my first Stihl and I'm a convert now. This is a big, expensive saw and it's a lot to throw around, but if you need the power it's your only option & it delivers.
Date published: 2017-05-15
Rated 5 out of 5 by from Great Saw I am 16 years old and make money on the side by cutting low risk trees and milling them with an Alaskan Mill into lumber to sell. I am by no means an expert but have a decent idea what I am doing. I love my 661! I purchased it right after Christmas in 2015. The 661 typically runs either a 25" or 36" bar with 33rs3 chain and is unstoppable even in the most gnarly wood. The balance of the saw is great but I find it to be perfectly balanced with a 25" bar. The 36" gets a little nose heavy but keeps the saw very nimble and maneuverable. A little expensive for me, but it continually proves it is worth every penny. On a side note I was cutting some trees for a farmer and got hung up in a gum tree by a gust of wind. As I walked back to the truck to get a wedge and saw tool the wind stopped, my saw fell out of the kerf, and got smashed by a 22" gum tree. This saw is so well engineered that similar to the front of a car folding like an accordion in an accident, the top handle on the saw folded like an accordion and absorbed the force of the tree. A few weeks later the saw was back up and cutting wood again.
Date published: 2017-05-12
Rated 5 out of 5 by from Unbelievable I cut a lot. Of timber from firewood to round wood and saw timber. I've been through many saws my most recent being the 66 magnum that I thought was a horse . Let me tell u these 661's impressed me !!! I think I'm gonna get another one. I've never had any trouble starting when hot or cold this thing just boots if u can stand to keep up with it , it'll take all u can give it !!!! Thanks for givin us these fine products..... Bump!!!!!!
Date published: 2017-04-26
Rated 5 out of 5 by from Strong Running Machine We have a new in ground pool, and had an old, large Poplar tree in the back yard. With this huge tree, the pool was going to stay full of leaves, all the time. It had to go. I needed a saw powerful enough to take this tree out. I did some research, and off I went, to purchase the king of saws. I was after the Stihl MS 880 Magnum. I looked in several stores, and nobody had the 880 in stock. Then I found the MS 661 C-M, with a 32 inch bar, and a skip tooth chain. This thing is a beast. It ate that Poplar tree for breakfast, and even ate a Cedar tree, that got too close to it. When I was done, it was looking around for more. Way to go, Stihl !
Date published: 2017-04-22
Rated 5 out of 5 by from Great saw I bought the saw because my old farm boss couldn't keep up with the clean up from hurricane matthew. I have not been disappointed once by this saw. It takes down trees in a hurry. Wind blown pines, white oaks, and large gum trees. Some of those oaks were 44 inches and against a 36 inch bar with a full skip chain, not a problem. My saw runs great but recently I started thinking it could be better. I sent it to a west coast faller and it is now a Magnum Insane-O Magnum. Check his 661c on youtube. hotsaws101 it runs like the terminator on steroids now.
Date published: 2017-04-19
Rated 4 out of 5 by from Ok saw Very hard to start even after warm up cut one tree up and now no start pulled my guts out shop is closed and Iam out of a saw
Date published: 2017-04-15
Rated 5 out of 5 by from Powerhouse This saw is an animal. 36inch bar burried in an Oak and the saw pulled like it was wearing a 25inch bar in a maple. Crisp smooth power. A real head Turner when you open it up on a job site.. starts amazing just a great saw.
Date published: 2017-04-04
Rated 3 out of 5 by from Fails to start when hot. Not sure what the problem is but after shutting down hot the saw won't start. Off to the shop to see. I have the same problem with my 362. Both saws are fantastic saws when running but..... Also, the problem is intermittent, not happening after every hot shutdown. I just know to have a couple of saws as backup when I'm useing either of these.
Date published: 2017-04-03
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