MS 661 C-M

MS 661 C-M
A professional chainsaw with enhanced fuel efficiency and STIHL M-Tronic™ technology.

Model Features

  • 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

  • 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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  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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.

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.

Reviews

MS 661 C-M is rated 4.6 out of 5 by 25.
Rated 5 out of 5 by from this saw is a beast this saw can really pack a punch it moves like a hot knife though butter
Date published: 2017-01-08
Rated 5 out of 5 by from Best saw i own I just bought this saw right before Christmas. I love it!!! It has the more power than i expected and its a lot lighter then my 064. The 064 is a beast but the 661 has it beat hands down. This is my go to saw now for all my cutting. I have a 024, 029, 064 and now the 661 and i have used all my saws hard and they hold up great.
Date published: 2017-01-03
Rated 4 out of 5 by from My 6 month review This is my daily saw it's pretty much a good saw. It is a little piggish on gas. Every once in awhile it will only start of its held wide-open. Has plenty of power in the six months I've owned it.
Date published: 2016-11-21
Rated 5 out of 5 by from Best saw I ever handled When you hold this saw in your hands you instantly know your holding something awesome. I can't pick it up without grinning ear to ear. Well worth the money
Date published: 2016-10-13
Rated 1 out of 5 by from Bad apple? What an absolute piece of junk. Do not buy. I repeat, do NOT buy this chainsaw! Problem after problem from day one. It's had a new cylinder and piston put in it, on top of every single warrantable part replaced. Along with a handful of non-warranty parts. Still doesn't run correctly. Much less, as advertised. Supposed to be a professional level saw yet you could walk into Walmart, buy the cheapest saw they have, and it would be more reliable. Extremely dissatisfied
Date published: 2016-09-07
Rated 5 out of 5 by from Is it wrong to love your saw more than ur wife? goes thru even the hardest wood like a hot knife thru butter
Date published: 2016-07-24
Rated 5 out of 5 by from MS 660 1 year later After 1 year of use I can say the MS 660 is a great saw. Always starts on 1 or 2 pulls, never has needed the choke but you must use the decompression button. I have the 20, 25 and 36 inch bars with Stihl carbide chains, as I cut mostly flood damaged, dirty wood. I have not found a tree that even challenges the saw. After about 4 hours of cutting I may switch to my MS044 as I start to get tired. The MS 660 is heavy but that really does help when cutting a felled tree, just hold the saw and it cuts all by itself. I could not be happier with a chainsaw than I am with my MS660, although my MS044 and 009 rate real close.
Date published: 2016-07-23
Rated 5 out of 5 by from Best saw for your dollar. This saw is the definition of professional. Tough durable and ready for any task when time equals money.
Date published: 2016-07-21
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Standard Features

  • Common Features for Chainsaws
    View the features common to many STIHL chainsaws.

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