Description:

The STIHL® MS 661 MAGNUM® professional chainsaw delivers the reliable power and rugged dependability you need for felling, de-limbing, and bucking large diameter trees. This chainsaw features a simple, proven, and non-electronic design. A fuel-efficient engine and low-maintenance air filtration system help keep operating costs low, while the STIHL® Anti-Vibration System reduces fatigue and improves handling when compared to the previous model, even when using long guide bars. The MS 661 MAGNUM® chainsaw is the perfect partner for forestry, municipal, and tree service professionals.

Features:

• Ematic™ Lubrication System – The Ematic™ guide bar, when used with STIHL OILOMATIC® saw chain, provides proper lubrication and reduces oil consumption compared to conventional methods. Two ramps in the guide bar rail help contain the flow of oil and direct lubrication to the sliding faces of the bar, chain links, rivets, and driver holes—reducing bar oil consumption by up to 50%.
• STIHL ElastoStart™ – An exclusive STIHL® feature, the ElastoStart™ starter handle includes a built-in shock absorber that reduces the effort needed when pulling the starter cord. It smooths out the peak compression forces normally felt during cranking.
• HD2 Air Filter – The washable HD2 air filter provides extremely long service life and reduces maintenance costs. Its large surface area extends run times between cleanings while maintaining high performance, even in dusty or dry conditions. It offers better engine protection than standard air filters.
• IntelliCarb™ Compensating Carburetor – Automatically adjusts the air/fuel ratio to maintain proper engine RPM, even as the air filter becomes restricted. Unlike typical carburetors that use air from the “dirty” side of the filter, IntelliCarb™ uses clean air, ensuring reliable performance.
• STIHL Quickstop® – A chain-stopping system designed to reduce injury risk in certain kickback situations. The STIHL Quickstop® chain brake can be activated manually by the operator’s hand or automatically by inertia, stopping the chain within fractions of a second.
• Bumper Spikes – Help prevent pull-in and provide greater control, making cutting easier and more stable.
• Lightweight Sprocket Cover with Captive Bar Nuts – A lightweight cover with bar nuts held securely in place, preventing loss during maintenance.
• Adjustable Automatic Oiler – Allows the user to regulate chain lubrication for different bar lengths and cutting conditions.
• Decompression Valve – Temporarily reduces compression in the cylinder for easier starting. Manually opened, it automatically closes once the engine fires.
• Side-Access Chain Tensioner – Provides easier access to adjust the saw chain with a bar wrench compared to the typical location of the adjustment screw.
• Master Control Lever™ – A single, easy-to-use lever that operates the choke, starting throttle lock, and on/off switch. The throttle trigger must be pulled before moving the lever to the choke position.
• STIHL Anti-Vibration System – Designed to reduce vibration levels in handheld outdoor power equipment, helping minimize operator fatigue and provide a more comfortable working experience.
• Toolless Fuel and Oil Caps with Retainers – Easy-open caps with retainers for quick refueling and oiling. Simply lift the lever and twist—no tools required.
• Throttle Trigger Lockout – A safety feature that must be depressed before the throttle trigger can be activated.

Specifications:

• Power Source: Gas
• Powerhead Weight: 16.5 lbs
• Guide Bar Length (Recommended): 36 in
• Chain Type: 3/8" RS3 (OILOMATIC®)
• Chain Oil Capacity: 13.5 oz
• Engine Power: 7.2 bhp
• Fuel Capacity: 28.7 oz
• Displacement: 91.1 cc
• Intended Use: Professional