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Description
STIHL MS 661 MAGNUM® Professional Gas Chainsaw – 91.1cc, 7.2 HP
The STIHL MS 661 MAGNUM® is a professional-grade gas chainsaw built for logging, forestry, tree service, municipal work, and other demanding commercial cutting applications. Its powerful 91.1cc engine delivers 7.2 bhp, providing the cutting performance needed for felling, de-limbing, and bucking large-diameter trees.
Designed with a simple, proven, non-electronic engine system, the MS 661 MAGNUM® offers rugged dependability and straightforward servicing. Its excellent power-to-weight ratio, professional anti-vibration system, washable HD2 air filter, and adjustable automatic oiler help professionals work efficiently through long and demanding jobs.
Key Features
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Professional 91.1cc Engine: Delivers 7.2 bhp for heavy-duty commercial cutting.
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Non-Electronic Design: A simple and proven engine system designed for dependable professional operation.
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STIHL Anti-Vibration System: Helps reduce operator fatigue and provides more comfortable handling.
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HD2 Washable Air Filter: Provides excellent engine protection and longer operating intervals between cleanings.
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IntelliCarb™ Compensating Carburetor: Automatically adjusts the air-to-fuel ratio as the air filter becomes restricted.
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Ematic™ Lubrication System: Directs oil precisely to the guide bar and chain, helping reduce bar-oil consumption by up to 50%.
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Adjustable Automatic Oiler: Allows oil flow to be adjusted for different bar lengths and cutting conditions.
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STIHL ElastoStart™: Helps reduce the sudden peak forces normally felt when pulling the starter rope.
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Decompression Valve: Temporarily reduces cylinder compression for easier starting.
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STIHL Quickstop® Chain Brake: Designed to stop chain rotation when activated manually or by inertia during certain kickback situations.
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Side-Access Chain Tensioner: Makes chain adjustment more convenient.
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Bumper Spikes: Provide better control while cutting and help prevent pull-in.
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Captive Bar Nuts: Help prevent the bar nuts from being lost during chain maintenance.
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Toolless Fuel and Oil Caps: Allow convenient opening and closing without additional tools.
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Master Control Lever™: Combines the choke, starting throttle lock, and on/off controls into one lever.
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Throttle Trigger Lockout: Helps prevent accidental throttle activation.
Technical Specifications
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Brand: STIHL
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Model: MS 661 MAGNUM®
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Product Type: Professional Gas Chainsaw
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Power Source: Gasoline
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Engine Displacement: 91.1cc
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Engine Power: 7.2 bhp
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Powerhead Weight: 16.5 lb without guide bar and chain
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Recommended Guide Bar Length: 25 in.
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Saw Chain: STIHL OILOMATIC® 3/8" RS3
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Fuel Capacity: 28.7 fl. oz.
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Chain Oil Capacity: 13.5 fl. oz.
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Engine Design: Professional non-electronic carbureted engine
Recommended Applications
The STIHL MS 661 MAGNUM® is ideal for:
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Professional logging and forestry
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Felling large-diameter trees
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Bucking and de-limbing
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Cutting large hardwood timber
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Tree service and storm cleanup
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Municipal tree maintenance
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Commercial firewood production
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Other heavy-duty professional cutting work
Who Is the STIHL MS 661 MAGNUM® Designed For?
This chainsaw is designed primarily for professional loggers, arborists, tree service contractors, forestry crews, municipal maintenance departments, and experienced commercial operators who need reliable power for large timber and demanding daily use.
Why Choose the STIHL MS 661 MAGNUM®?
The MS 661 MAGNUM® combines high cutting power, dependable construction, reduced vibration, efficient chain lubrication, and professional-grade filtration. It is an excellent choice for experienced operators who need a durable chainsaw capable of handling large trees and long guide bars.
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment is an authorized STIHL dealer serving Fort Myers and Southwest Florida. Our knowledgeable team can help you select the correct chainsaw, guide bar, chain, accessories, and protective equipment for your application.
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Genuine STIHL equipment and accessories
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Professional product knowledge
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Local setup and dealer support
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Replacement chains, guide bars, oils, and maintenance supplies available
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Established outdoor power equipment dealer in Fort Myers, Florida
Contact Barry’s Power Equipment for current availability, pricing, and configuration options.
Important Safety Information
The STIHL MS 661 MAGNUM® is a powerful professional chainsaw intended for trained and experienced operators. Always read and follow the instruction manual and wear appropriate personal protective equipment. Improper chainsaw use can cause serious or fatal injury.

