MS 661 R C-M - $1,239.99 DSRP



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The MS 661 professional chainsaw with a wrap-around handle (R) for greater maneuverability.

For greater maneuverability when felling large trees, turn to the impressive performance of the MS 661 R C-M. Its wrap-around handle also provides greater operator comfort when cutting. Just like the MS 661 C-M, the saw includes STIHL M-Tronic™ engine monitoring technology and delivers less vibration and 20% greater fuel efficiency than the MS 660. Other features include long-life filter system us...Read More
Print Spec Sheets
MS 661 R C-M Specifications
DISPLACEMENT 91.1 cc (5.56 cu. in.)
ENGINE POWER 5.4 kW (7.2 bhp)
POWERHEAD WEIGHT 7.66 kg (16.8 lbs.)
FUEL CAPACITY 825 cc (27.9 oz.)
CHAIN OIL CAPACITY 360 cc (12.1 oz.)
OILOMATIC® CHAIN 33 RS3
GUIDE BAR LENGTHS* (Recommended ranges) 40 to 80 cm (16" to 32")
POWER SOURCE Gas
STIHL recommends #3624 (33 RS3 84) OILOMATIC® saw chain and 25" 3003 000 4030 STIHL ROLLOMATIC® ES 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

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    Wrap Handle (R)
    Saw can be used in multiple positions for felling or limbing with hands in the proper positions.
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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!

    More Information

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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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    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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    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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    •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

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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.

  • 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
  • STIHL Pro Mark™ Apron Chaps Zoom
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    STIHL Pro Mark items are "Wash and Wear." They do not require dry cleaning as other brands do.

     


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MS 661 R C-M is rated 4.3 out of 5 by 21.
Rated 5 out of 5 by from Like a hot knife in butter. As a timber farmer here in the PNW, I have been running saws for almost 30 years, and this is the best Stihl that I have ever used. My old 066 used to vibrate so much that after 4 hours of use I could not feel my hands. No more. This saw has a very much improved isolation system and even more power. My dealer told me to be careful with its fuel, and I have not had it long enough to comment. But I bought the Stihl canned gas just in case I give the chainsaw work a break for a few months. Want the best? Spend the money and get this saw.
Date published: 2017-06-30
Rated 5 out of 5 by from Good stuff yeye Ime a full time chaser on a thinning yarder, i bought this saw for personal use and use at work when only tree length comes to the landing. We got no processor or dansco and i buck 100+ foot logs with this saw. It starts everytime and doesnt even need the choke if you wanna rip on it a few extra times. My 661 gets tossed, thrown, and stepped on and packed with mud and gets wet all the time and still runs better than the lil 461's. I highly recomend it but ONLY run clear gass mix with stihl's brand of mixing oil otherwise you do get the same problems as all these other guys who blow up somthing too big for their balls
Date published: 2017-05-06
Rated 2 out of 5 by from This product needs a factory revision Starts hard when it is warm. We use it to cut logs on the landing and when you run it hard it will stall and not start up again. Sometimes you have to wait over half an hour for it to start again.
Date published: 2017-05-05
Rated 5 out of 5 by from The best saw ever made This is the best saw ever made. My tree service owns 5 of them and plan on a few more. It can kick back when cutting a knot. LOVE this saw. whenever one dies Im hanging one in my man cave
Date published: 2017-05-04
Rated 2 out of 5 by from This saw has intermittent problems and issues Saw works good most of the time but it stalls out sometimes and is hard starting and eventually after four months blows up. This is after a professional break-in, using stihls synthetic mix with 91 ethanol free fuel only. Took it back to the dealer can I find out why it failed. The only possibility they told me was it could've been from dust ingestion from the dirty filter
Date published: 2017-03-22
Rated 4 out of 5 by from Great power out of this saw but... I love the power and features however it cottons to have hot start issues which I've been hearing about a lot more. I will love this saw more if it gets fixed correctly...
Date published: 2016-10-04
Rated 1 out of 5 by from This saw has descent features but is absolutely unreliable i have 2 and they blow up every 50 hours of use completely unacceptable Have had nothing but problems with 661 blow up every 60 to 80 hours
Date published: 2016-09-09
Rated 5 out of 5 by from The F1 of Stihl saws I'm a timber cutting contractor. I've been cutting for nearly 40 years. I run a saw 7 hours per day. I've owned over 50 Stihl pro saws. I have never been so impressed with a new saw as I am with this one. The one major change over the 660 is the automatic carb. I thought I would hate it but I absolutely love it. Starts easy and runs perfect. The multi switch is great- it always springs back to the run position. Super handy. The bar nuts are attached to the clutch cover- try losing one of those! The starter/fan cover is flatter and consequently MUCH easier to sight with. It also has a sight that runs parallel to the bar when you're getting down to the last of your holding wood. Brilliant! The air filter lasts all day even here in California's dry Sierra bark dust. Spring anti vibe is definitely smoother than rubber. Muffler is quiet. Love the "can't lose 'em" fuel and oil cap. Super torque but revs like an F1 racer. And to top it all off, it burns about 20% less fuel than the 660! We still have some pretty big wood here in CA (I get at least one 5' every week) and this saw was made for what I do. Love it!
Date published: 2016-07-10
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