A professional chainsaw with enhanced fuel efficiency and STIHL M-Tronic™ technology.
When professionals need to fell large trees, in large quantities, they reach for the saw they know has the power to get the job done – the MS 661 C-M. Featuring an impressive power-to-weight ratio and STIHL M-Tronic™ engine management technology, the MS 661 C-M chainsaw also delivers less vibration and 20% greater fuel efficiency than the MS 660. Other features include a 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. The Wrap-handle version is available in select areas. See MS 661 R C-M.
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.
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 the dirty air filter and changes in elevation and fuel quality for optimum engine power at all times.
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.
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.
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.
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.
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 OILOMATIC Saw Chain
STIHL makes its own saw chains.
Includes a polymer ramp reservoir that holds bar oil until it can be picked up by a passing chain. This can reduce oil usage by up to 50%.
They help prevent pull-in and provide better control, making cuts easier.
Spark Arrester Muffler
Has large baffles which reduce noise levels and contain a screen designed to reduce the emission of sparks.
STIHL Quickstop® Chain Brake System
Designed to stop the chain in fractions of a second. Can be manually activated by inertia if the kickback force is sufficient.
Front Hand Guard
Designed to reduce the risk of injury.
Designed for a secure grip and ergonomically angled for comfort.
Protected Spark Plug
Protected, yet easy to change.
Large Starting Handle
Easy to grip.
Smooth Clean Design
Has no rough edges to snag on clothing or brush.
Air Filter Cover
Easy to remove for fast and easy filter cleaning or replacement.
Master Control Lever™
Is a single lever operating the choke, starting throttle lock and on-off switch.
Rear Hand Guard
Reduces the risk of injury as well as provides a wide area for foot placement during starting.
High-Tech Polymer Housings
Lightweight, withstand greater impact, and are corrosion-resistant.
Translucent Fuel Tank
Allows operator to easily check fuel level before starting work.
Helps reduce operator fatigue.
Provides easier starting and smoother running.
Replaceable “In Tank” Fuel and Oil Filters
Lower cost and are easy to maintain.
Inboard Chain Brake
Requires less maintenance and makes saw chain sprocket easier to remove.
Automatic Bar and Chain Oiler
Lets the operator concentrate on cutting, not bar lubrication.
Helps reduce the risk of operator contact by a chain if it should break or derail.
Throttle Trigger Lockout
Must be depressed before the trigger can be activated.
Other STIHL Professional Chainsaws
- STIHL MS 261
- STIHL MS 261 C-M
- STIHL MS 362
- STIHL MS 362 C-M
- STIHL MS 362 R C-M
- STIHL MS 400 C-M
- STIHL MS 462 C-M
- STIHL MS 462 R C-M
- STIHL MS 500i
- STIHL MS 500i R
- STIHL MS 661 MAGNUM
- STIHL MS 661 R C-M MAGNUM
- STIHL MS 661 R MAGNUM
- STIHL MS 880 MAGNUM
- STIHL MS 881 MAGNUM
- STIHL MS 881 R MAGNUM