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.
  • Zoom
    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.

  • Pro Mark™ Forestry Helmet System Zoom
    Pro Mark™ Forestry Helmet System
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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 99.9% 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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Are You Ready for a STIHL?

MS 661 C-M is rated 4.5 out of 5 by 50.
Rated 5 out of 5 by from Christmas gift to myself I added the MS661C to my inventory of Stihl chainsaws shortly after Christmas 2015. My other saws include a MS441C, MS261C, MS201TC-M and a couple MS150's. Soon after buying the MS661C with a 36" bar, a coworker asked me to cut a freshly downed oak for him to use as firewood. Cutting 42" diameter pieces of trunk into 14" lengths seemed like a great way to break-in this saw.I was very impressed with the MS661C's capability. I cut the trunks into 14" thick discs, then segmented the discs using my MS261C. The MS661C operated flawlessly, and I only needed to resharpen the chain 3 times during the course of producing over 500 pounds of sawdust. Admittedly, I was worn out after each of the three 4-hour sawing periods.My experience with the Stihl M-tronic saws has been terrific, and I must give a shout-out to my favorite Stihl dealer, Land & Coates of Newport News, VA. BTW, I also bought a KM130R multi-task system with straight-shaft trimmer and blower attachments.
Date published: 2016-01-18
Rated 2 out of 5 by from problems hy im from italy,i am very disapoined of my 661 it shut down and decrese power unexpected.i will sell it and rebuy the old 660 that is a real saw
Date published: 2015-12-16
Rated 1 out of 5 by from Broken from the start I purchased a bran new 661 and began having problems with it on the very first job that I used it on. The saw engine would abruptly cut off and would not start until it cooled down. Also if you turned if off after running it it would not start either. I have had it in the shop for at least six times maybe seven and it is still in the shop now. The warranty is running out and I have only been able to use the saw on three jobs. I have been happy with other Stihl saws but this one is a Lemon.
Date published: 2015-11-09
Rated 5 out of 5 by from Smooth Operator Added the 661 last year as my second M-Tronic (362 cm). Nice improvements. I still kept my 660 and 362 as well. The new 661 seems to have a smoother powerband in the cut. The 661 also oils better. I'm upgrading my 660 to a high output oiler. I really like the M-Tronics but was sorely disappointed that it was switched to the flippy caps instead of screw caps. Captive bar nuts are neat but I never lost one and always carry a couple spares just in case. All saws and other Stihl equipment kept running well with fresh ethonol free fuel and Stihl Ultra oil and sharp chain. Always excellent service from independent Stihl dealer.
Date published: 2015-11-05
Rated 5 out of 5 by from Excellent saw with great power I upgraded from a excellent running 046 magnum with a 25 inch bar. Didn't really need a larger saw, but wanted to try a new m-tonic. I traded up to a new 661 with a 28" lightweight bar and WOW!! I was really impressed. Tons of power and not a bit disappointed despite of being apprehensive of trading a great running saw for a newer and bigger one. Will cut thru any type tree with ease. I couldn't expect anything less from my dealer, Martin's small engine repair, they are the best! Own 6 chainsaws and a weedeater. STIHL. the name says it all.
Date published: 2015-10-25
Rated 5 out of 5 by from Great Saw - Would buy again! I don't normally do reviews, but I really like this saw. I have a 362cm as well. I rarely use the 362 after getting this saw. Tons of power and cuts the oak around me like butter. Great saw for sure. I would buy another no doubt. Always impressed when I use this saw.
Date published: 2015-09-27
Rated 5 out of 5 by from My favorite saw This saw is incredible. I have not found a tree that will stop it! I bought after running 2 different friends 660s, which are nice units, but sometimes hard starting. This saw starts right up, and goes to work. I have a 362, but find myself using the 661C more. I can put up a lot of firewood, a whole lot faster now.
Date published: 2015-07-14
Rated 5 out of 5 by from Smooth power I upgraded from a 66 Magnum. This saw starts easier and runs smoother. It has good power. The new fuel/ oil caps are nice as well as other convenient features. The shut off, the cover nuts being retained and the M tronic fuel system. I would recommend this saw for sure!
Date published: 2015-06-08
Rated 5 out of 5 by from upgraded Upgraded from an 0 36 to this bad boy,easy starting an less vibration,and cranks right up
Date published: 2015-05-29
Rated 5 out of 5 by from The best choice Upgraded from a ms660 mag and immediately the results were noticeable. The ms661 never loads up....it has more low end torque along with overall more power a refined power band....its quieter and uses less fuel....along with easy starts in any temperature . It has less vibration and easier to use. Thanks again Stihl
Date published: 2015-04-12
Rated 5 out of 5 by from great saw why is the 660 rated for up to a36 inch bar and you only rate the 661 to a32 inch bar which has more power.
Date published: 2015-03-13
Rated 5 out of 5 by from The m-tronic carb raised the bar for chain saws no more tuning carb when cutting in below zero temps. can idle forever & not load up .
Date published: 2015-02-18
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