MS 661 C-M - $1,199.99 DSRP



Quantity:

Reserve with STIHL Express for In-Store Pick Up

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.
  • Zoom
    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: Cancer and Reproductive Harm - www.p65warnings.ca.gov
ADVERTENCIA: Cáncer y Daño Reproductivo - www.p65warnings.ca.gov
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
We Also Suggest
  • HP Ultra 2-Cycle Engine Oil Zoom
    HP Ultra 2-Cycle Engine Oil
    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.

Are You Ready for a STIHL?

MS 661 C-M is rated 4.5 out of 5 by 71.
Rated 5 out of 5 by from As a logger and daily user of this saw i love it. The 661 is about a half a year old now and i have used it almost every day that ive had it now and the saw has awesome power. I wasn't a fan of the m tronic system being on this new 661 but I am brand loyal to stihl and gave it a chance. The fuel solenoid did eventually give me some hicups but the great folks at stihl have made right on standing behind their product and are fixing the issue free of charge so i am more than pleased and thankful. I would buy another. The ani vibration is second to none and she is truly a beautiful smooth ride through the wood!
Date published: 2018-07-09
Rated 5 out of 5 by from Great machine I love this saw, power for days, starts on 3rd pull every time when cold, 1st pull when warm, very light for the size and power, runs a 32" bar easily, best saw I've ever run!
Date published: 2018-06-24
Rated 1 out of 5 by from Worst piece of power equipment I've ever owned I have owned or currently own the O29 Farm Boss, O34 Wood Boss, MS 291 and TC 151 chainsaws. I have owned too many backpack blowers and trimmers to count. I have never considered anything other than Stihl products. I grew up doing Farm Work , Professional Landscaping and serve as an active Firefighter using Stihl products. I'm not new to these products. DO NOT BUY THIS SAW! In two years I have been able to use it for less than an hour. I will say that the couple times I have been able to start it, the saw is very impressive. Unfortunately it never starts. It prefers to flood and spew fuel out of the exhaust.
Date published: 2018-05-10
Rated 5 out of 5 by from I run it six days a week. Always starts and runs strong It's been a great saw. I bought it at hurricane Matthew. Ran it for 45 mins . Took it back and it was time for me to go back home. I went and got the saw because they had not fixed it and I w as s going home. I took it to Howard Brothers. A stihl rep came and approved all new engine. The diagnosis was scorn piston. The electronics showed I was telling the truth. 42 mins of run time. Has been an awesome saw since .
Date published: 2018-04-15
Rated 5 out of 5 by from Powerful machine it's powerful, it's performing really good. No problem so far. We had milled over 8 x 7-8 foot logs and so far it's milling so good. We bought a different chain than the original chain that came with the 36" and it cuts better and faster. We used the recommended high octane gasoline and oil, so I hope this will last a long time.
Date published: 2018-04-09
Rated 5 out of 5 by from UN STOP ABLE ! This saw is truly insane ! I"ve run up through the 460/461 series of saws for years and thought that the 460 / 461 series would be tough to beat, and was more than enough .. All that until I actually got my hands on a 661C, and fellas, I'm tellin' ya .. the 661 hardly weighs any more than the 461 if it weighs any more at all, starts on the FIRST pull ( hello electronic ignition ) and so help me, outcuts and outperforms ( and I never thought I would have said it ) the 461 literally 3:1 when bucking the same logs with identical 36" bars. So bring it, gentlemen ! ( but you might want to leave your gamblin' hats at home, because I take any comers think their gonna beat that saw easy .. ) :)
Date published: 2018-04-05
Rated 5 out of 5 by from Great saw Bought saw to tackle big trees purchased with 25 inch bar an added a 36 inch bar as well runs both with no problems
Date published: 2018-03-29
Rated 3 out of 5 by from Tree service owner All I’ve got to say is she is no 660. Not to big of a fan of the m-tronic, have had her cut out mid cut a couple of times, and the biggest reason for the review is to also agree with others on how hard of a start she gives when shut down hot. Have to hold wide open and pull till she fires. Very annoying after about 10 pulls, 3 times a day. Knowing all of this, I’m scared to buy another Stihl, while currently I own 660,661,201tc, 192tc. And planning on getting a pair of 50cc saws. Do I buy stihl, or jump ship?
Date published: 2018-03-28
  • y_2018, m_7, d_17, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_71
  • loc_en_US, sid_ms661cm, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_stihl