MS 661 C-M - $1,199.95 DSRP


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
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    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.

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    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!

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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
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    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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MS 661 C-M is rated 4.6 out of 5 by 59.
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
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
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