MS 661 R C-M

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

Product Description

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 management technology and delivers less vibration and 20% greater fuel efficiency than the MS 660. Other features include long-life filter system using HD-2 filter elements to provide longer run times between maintenance, an ElastoStart™ handle and a high output adjustable oiler. (Wrap-handle version is available in select areas only).

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.

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

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 (12.2 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 STIHL ROLLOMATIC® ES guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.

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 R C-M is rated 4.5 out of 5 by 30.
Rated 5 out of 5 by from Runs great,outstanding power, easy to start I was a little nervous about electronic engine control after reading some negative reviews, but I have had zero problems with this saw a couple of weeks in. Power is excellent - it feels like a lot more than my trusty 460, but I don't have numbers to back that up. The new start system works great and you don't have to guess about which start cycle to use. My last 90cc saw was an 056 Magnum II, and starting that was a complete Jane Fonda workout. Probably didn't help that the crank seals were shot. The 661 does go through a lot of gas on full throttle, but I have never seen a saw pile up sawdust like the 661 - you're ankle-deep before you know it.
Date published: 2019-10-07
Rated 5 out of 5 by from This saw has amazing power. I had a few hiccups with this machine in its first few weeks. My dealer fixed it very quickly, and it was back running in less than a day in the shop. After that it has been a beast, working harder than I ever could!
Date published: 2019-06-15
Rated 5 out of 5 by from Exceptional Saw on Every Front Equipped with a 20" bar, this saw is definitely not for the inexperienced user - tons of power and extremely handy for its size. It's been exceptionally reliable. I have never had an issue with cold or warm starts - it always does exactly what I ask of it... extremely well. I've tried it with up to a 28" bar - never an issue with power. I prefer the shorter bar for maneuverability.
Date published: 2019-02-19
Rated 5 out of 5 by from Power and durability This saw has the power to pull large chains in hardwood. I found the 661 to be the right combination of power and weight for falling and sectioning large oak. Lots of chain speed for a big saw. Best saw I have had the opportunity to handle. Love it.
Date published: 2019-01-29
Rated 5 out of 5 by from Great saw Great saw. used now for a year with no problems starting. Only thing i don't like is its love of gas but after you see what you have cut in a short time i'm ok with it. I run a 28 and 36 inch bar with no problems. The air filter is much better then my old 044 when you pull the filter off the dust doesn't fall of into the carb like my 044 did.
Date published: 2018-06-05
Rated 3 out of 5 by from Season two the saw won't start. Current status is the saw is still in the shop, they have to order in the carburetor kit. Since I'm going out again tomorrow I purchased a 461 as a back up for the bigger stuff. Keeping my fingers crossed that it runs through the season. .
Date published: 2018-05-31
Rated 5 out of 5 by from only good for one tank of gas every day The saw runs great for the first tank of gas, then it will not start for twenty or thirty minutes. I went online to read about this problem it seems to be happening to alot of the 661's I read I may be due to pressure build up in the tank, Also, once it pops on choke, do not choke it again to start, my ms 390 starts much more reliabliy. If 661 floods it does take overnight to start again. The reason I gave it a 5/5 is that Stihl has provided great service everytime I had an issue I am sure it will work out fine.
Date published: 2018-05-07
Rated 5 out of 5 by from I keep coming back to Stihl quality! I started with a Stihl 041 AVES in the 1980's. It never failed me. I replaced it with an 066 Magnum in the 1990's which I recently sold for enough to pay for my dachshund's dental surgery! I just got the new 661 R-CM. The wrap handle is more than just comfortable. On my previous saw, it saved it from being crushed when it got pinched during felling, twice! It really assists lefties.I hear of complaints about the M-Tronic feature from some users resulting in the saw bogging or hard to start when warm. Do not frequently "quick-trigger" the throttle as this confuses the auto-adjust feature. Run the saw at a steady throttle prior to shutting it off. The "confusing" conditions can occur when rapidly limbing a log. Every operator has slightly different techniques, so if the M-Tronic feature doesn't suit you, go with the MS-461/880 saws..they lack this feature.I set-up my 661 with an 8-tooth sprocket, a 32" Rollomatic ES Light bar, & .050 X 3/8" skip-tooth chain. The saw has the power to handle the higher chain speed of that sprocket. The "Light" bar weighs about 30% less than the standard bar & definitely improves balance, especially with the longer bars. That longer bar also helps save back fatigue from stooping while limbing/bucking.I recommend 91+ Octane (ethanol-free) fuel with Stihl Ultra mix. Its like giving a treat to your dog! I ran that 066 for 20-yrs. & the carburetor had never been adjusted in all that time & it never failed to start!
Date published: 2018-03-01
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Standard Features

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

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