Description:

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 previous model. 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.

Features:

• STIHL M-Tronic™
• A new generation of intelligent engine management that eliminates carburetor adjustment screws and automatically compensates for dirty air filters, elevation changes, and fuel quality variations, ensuring optimum engine power at all times.
• Ematic™ Lubrication System
• A guide bar and chain lubrication system that reduces oil consumption by up to 50% by directing oil precisely to sliding surfaces through ramps in the guide bar, when used with STIHL OILOMATIC® saw chain.
• STIHL ElastoStart™
• A starter handle with a built-in shock absorber that smooths out the sudden peak forces during pull-starting, reducing effort and fatigue.
• IntelliCarb™ Compensating Carburetor
• Automatically adjusts the air/fuel ratio when the air filter becomes clogged, maintaining correct engine RPM by using air from the clean side of the filter rather than the dirty side.
• STIHL Quickstop®
• A chain brake safety system that stops the chain instantly when activated by the operator’s hand or inertia during a kickback, reducing the risk of injury.
• HD2 Air Filter
• A washable, long-life air filter with a large surface area for extended run times and excellent engine protection in dusty conditions, lowering maintenance costs.
• Bumper Spikes
• Spikes that prevent pull-in and improve control during cutting for easier operation.
• Adjustable Automatic Oiler
• Allows users to adjust the amount of lubricant delivered to the guide bar and chain based on bar length and cutting conditions.
• Decompression Valve
• A valve that reduces cylinder compression during starting, making it easier to pull the starter rope; it opens manually and closes automatically when the engine fires.
• Lightweight Sprocket Cover with Captive Bar Nuts
• Lightweight sprocket cover design with captive bar nuts secured in place for easy and efficient saw chain maintenance.
• Side-Access Chain Tensioner
• Allows convenient saw chain tension adjustment from the side of the chainsaw using a bar wrench, simplifying maintenance.
• Master Control Lever™
• A single lever controlling choke, throttle lock, and on/off switch functions, requiring the throttle trigger to be pulled before moving to choke position.
• Anti-Vibration System
• A system engineered to reduce vibration levels, decreasing operator fatigue and providing a more comfortable working experience.
• Toolless Fuel and Oil Caps with Retainers
• Caps that can be opened or tightened without tools by simply lifting a lever and twisting, for easy refueling and maintenance.
• Throttle Trigger Lockout
• A safety feature requiring the lockout button to be pressed before the throttle trigger can be engaged, preventing accidental acceleration.

Specification:

• Power Source: Gas
• Powerhead Weight: 16.5 lbs.
• Guide Bar Length (Recommended): 25 in.
• Chain Type: OILOMATIC® 3/8" RS3
• Chain Oil Capacity: 13.5 oz.
• Engine Power: 7.2 bhp
• Fuel Capacity: 28.7 oz.
• Displacement: 91.1 cc