Simply the most popular commercial chain saw in the world for felling, trimming and all commercial and forestry applications. The MS 661 C-M is a rugged all-rounder equipped with STIHL's environmentally friendly 2-MIX engine technology for less fuel consumption, less emissions and outstanding cutting performance. In addition the MS 661 C-M features a heavy duty (HD2) air filter system with a radial seal which keeps out fine dust particles combined with the compensator the MS 661 C-M can now be used for 20% longer than the MS 660 before a filter clean is required. The MS 661 C-M is fitted with STIHL's M-TRONIC electronic engine management system which enables the saw to automatically adjust to varying fuel grades, changes in altitude and temperature and as there are no manual carburettor adjustments starting this saw is easier than ever before, simply push the start level to the on position and pull. The MS 661 C-M is now the only choice for professionals.
STIHL Oilomatic saw chain pitch/type
1) Without fuel, without bar and chain
This air filter keeps even the finest dust away from the engine, ensuring a particularly long service life. Thanks to special material, the filter can be washed clean, for example with STIHL Varioclean and warm water.
The decompression valve is part of the easy start-system. The valve should be pressed before starting in order to reduce the compression pressure when starting, as well as the effort needed to pull the starter rope. The decompression valve is semi-automatic, meaning that it must be pressed manually before starting, but then closes automatically.
STIHL M-Tronic (M)
For a cold start, the STIHL M-Tronic only needs one start position on the combi-lever. After starting, you can immediately power up to full speed. The amount of fuel required is precisely calculated by the system and supplied as needed. Otherwise, start in position I as usual.
STIHL anti-vibration system
Intense vibration at the handles of power tools can lead to longer-term effects of blood vessels in the hands and arms. STIHL have therefore developed an effective anti-vibration system where by the oscillations from the machines engine are dampened which significantly reduces vibrations at the handles.
This controller in the carburettor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburettor depending on the quantity of air passing through the air filter. This keeps the fuel/air ratio in the combustion mixture constant and hence also the engine power. The filter doesn't need to be cleaned until an appreciable drop in power occurs.
Captive bar nuts
Bar nuts held captive in the sprocket cover will not get lost when changing over the cutting attachment.
Controlled-delivery oil pump
The exact chain oil output can be adjusted maunally for varying conditions, allowing for a reduction of up to 50%.
QuickStop Chain Brake
The QuickStop chain brake is a protective mechanism when handling chainsaws. The chain brake is operated via the front hand guard and brings the saw chain to a standstill in fractions of a second. If the kickback is strong enough, the Quick Stop Chain Brake automatically releases.
Side-mounted chain tensioning
The tensioning screw is located on the side of the chain saw through the sprocket cover. Chain side tensioning allows the saw chain to be retensioned effortlessly, avoiding any contact with the sharp chain.
The Ematic chain lubrication system ensures pinpoint lubrication of the saw chain links and guide bar rails. When used with STIHL OILOMATIC saw chain, it will provide maximum lubrication, longer wear and less oil consumption than conventional methods of chain lubrication. The Ematic system can reduce bar oil consumption up to 50%.
STIHL ElastoStart reduces the shock caused by the compression of the engine during starting. The compression shock is taken away from the users joints and muscles through a spring or rubber element in the starter handle.
Tool free fuel caps
Special caps on the fuel and oil tanks are designed for easy opening and locking without the need for tools.
STIHL Moisture Meter
The STIHL moisture meter is lightweight and easily fits in your pocket. It has an easy to read screen with a wristband for safe holding. A simple on-off button and a removable sensor cover.
Low weight helmet set with optimized balance. Ear caps in slim design. Easy head size adjustment by ratched wheel even whilst wearing. Ventilation wholes spread over the entire shell. Metal visor: Spring steel mesh, very high light penetration. Light transmittance: 75-80%. Elastic visor sealing nlong the helmet against dirt and rain. Reflective Stickers all round. Ear protect: EN 352, EN 397, EN 1731.
Practical, multifunctional quality tool in a sturdy plastic case with both a 3.5 mm (for carburetor adjustments and cleaning grooves) and 7.0 mm slotted screwdriver. Torx blade TX27 and 19-13 and 19-16 spark plug wrenches. Includes a nylon bag and belt loop.
Multi function spray that cleans a number of tools and leaves a protective film that does not harden on the surface and thereby protects against corrosion. Rotating parts are lubricated. An essential all-rounder for every workshop. 400ml spray can.
Comfort saw chain with low vibration, soft cutting behavior and less chatter and extremely high cutting and piercing power. For professional use in forestry. Our recommendation for machines with engine power over 2.5 kW. For hard and frozen wood.
High-quality standard with excellent cutting and piercing power. Main application: For high demands in professional applications during felling and bucking on chainsaws medium to high capacity. Rail body: Three-welded metal plates. The middle is cut out over a large area. This high stability at very favorable weight. Saw chain runs over exchangeable, robust bearing sprocket with 11 teeth, which must not be lubricated. Extremely robust Stern storage with 6 rivets.
Made from cow hide leather, STIHL DYNAMIC work gloves have an ergonomic curved design for better grip, higher comfort and reduced fatigue. An elastic cuff supports the wrist and prevents dirt or chips from entering the glove. Cut protection level Class 1. Ideally suited to top-handle saw users, tree care professionals, forestry workers and landscapers or demanding land and homeowners.
Protect yourself from cold and wind when working with this warm, flexible and lightweight jacket. Highly breathable and quick-drying with waterproof hi vis orange panels and water repellant dark panels.Highly elastic, fast drying and warming. Functional zones: Black areas are water-repellent and breathable, coloured zones are waterproof and breathable, chest and inside pocket and abrasion protection on the shoulders.
Available at participating stores. Ready-mixed fuel (50:1) for all STIHL engines, optimal performance, best cold start ability, maximum acceleration over the entire RPM range, best running characteristics even with a sudden gas change. Mixed with STIHL HP ultra premium oil for exceptional engine lubrication and extreme cleanliness, fully synthetic and biodegradable for optimal performance and long service life. User- and engine-friendly thanks to fewer emissions (free from ethanol; almost no olefins and aromatic compounds). Can be kept in storage for at least two years. Reliable top performance – STIHL engines and STIHL MotoMix are made for each other, all imaginable uses have been put through rigorous tests.
Do you question which lubricant is suitable for which cutting attachment, climate zone or type of wood? No need to puzzle over the answers with semi-synthetic STIHL chain lubricant. Our high-performance lubricant is extremely suitable for all moving saw chains. Well protected. STIHL chain lubricant effectively protects saw chains from wear. Thanks to its high temperature resistance, cutting attachments are optimally protected even from short-duration maximum thermal loads. Smoking is inhibited. Keeps on flowing. Even at temperatures down to -20° C, STIHL chain lubricant retains its outstanding flow properties. Selected additives prevent resinification of the cutting attachment and other treated parts. And you can start using the saw straight away, even after an extended idle period.
Particularly eco-friendly with outstanding lubrication and adhesive properties. STIHL BioPlus oil is derived from plants and completely decomposes in the ground within a short space of time (tested according to OECD 301 B). It has therefore been awarded the German 'Blue Angel' ecology mark and the Dollarspean Eco-Label.
When working at heights with chainsaws, flexibility, breathability, comfort and protection are essential. X-Flex pants combine ultralight, extremely breathable AVERTIC™ pro lite cut-protection - material developed exclusively for STIHL - and the latest in breathable and durable fabrics. This combination creates a market leading product that not only looks good, but keeps operators cool and protected. AS/NZS 4453.3:1997.
Fully synthetic oil with exceptional lubrication properties. Burns with extremely low residue due to ash-free additive. Suitable for continuous use under the most demanding engine conditions. Performance class: JASO-FB, ISO-L-EGB. Fuel/oil ratio 1:50.
Water based, alkaline detergent specifically for dissolving and removing organic oil residues and for cleaning air filters and housings. The detergent is biodegradable. Avoid contact with the eyes and keep out of reach of children.
*Prices are valid from the 14/09/2020 to 15/11/2020. STIHL stores are operated as independent businesses. The products described in this website may not be on display or available at each STIHL store. STIHL reserves the right to change pricing at any time without notice.
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.