MS 661 C-M W
MS 661 C-M W petrol-driven chainsaw: for high performance even in winter forestry use
General
The competition chainsaw used in the STIHL TIMBERSPORTS® series. Big-timber saw for the toughest jobs in forestry. M-Tronic guarantees optimum engine performance at all times, as well as easy starting thanks to its single start position and stop button function, controlled-delivery high-performance oil pump for high delivery capacity, HD2 filter with very good filter effect and economical 2-MIX engine. Electric heated handles (W) for warm hands and better grip in winter.
Versions
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MS 661 C-M W, RS, Bar length 50cm
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MS 661 C-M W, RS, Bar length 63 cm
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MS 661 C-M W, RS, Bar length 71cm
Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.
Product versions
- MS 661 C-M MS 661 C-M petrol-driven chainsaw: cutting-edge technology for forestry work
Technical specifications

Technical specifications
Technical specifications | Value |
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Displacement | 91,1 cm³ |
Power output | 5,4/7,3 kW/PS |
Weight 1) | 7,5 kg |
Power-to-weight ratio | 1,4 kg/kW |
Sound pressure level 2) | 105 dB(A) |
Sound power level 3) | 118 dB(A) |
Vibration level left/right 4) | 6,9/5,6 m/s² |
Saw chain pitch | 3/8" |
STIHL Oilomatic saw chain type | Rapid Super (RS) |
1) Without fuel, without bar and chain
2) K-factor according to DIR 2006/42/EC = 2.5 (dB (A))
3) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
4) K-factor according to DIR 2006/42/EC = 2m / s ²
Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.
Features

Standard equipment
Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.
Accessories

Accessories
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Multi-function tool
Practical, multi-function quality tool in a sturdy plastic case. 3.5 mm flat-blade screwdriver for carburettor adjustment and cleaning grooves, Torx® TX 27 screwdriver, nylon pouch with belt loop. Width across flats 19-13 for MS 271, MS 291, MS 311 and MS 391, width across flats 19-16 for MS 170, MS 171, MS 180, MS 181, MS 193 C, MS 211, MS 231, MS 241 and MS 251.
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DYNAMIC Protect MS
Made from cow hide leather, STIHL DYNAMIC Protect MS 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.
Technical specifications Value Cut protection class Class 1 Elasticated or fitted cuffs Yes Lined Yes Waterproof no -
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DYNAMIC EXTREM helmet set
Upgraded helmet set with adjustable ratchet and V5 visor system. Three-zone visor with very high light penetration. With UV indicator. EN 352, EN 397, EN 1731.
Technical specifications Value Ear protection SNR 28 (H:35, M:26,L:18) Sound level 108 dBA Helmet material ABS (G 3.000) Inner fittings 4-Point Light penetration 60-70-80 % Weight 650 g FPA tested Yes -
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ADVANCE GTX trekking chainsaw boots
Special profile sole with very good grip. High-quality, water-repellent suede. With breathable and waterproof GORE-TEX® membrane. Additional water and wear protection provided by high-rise rubber edge. Highly absorbent, removable inner sole. Suitable for demanding, professional chainsaw users on hillsides and for tree maintenance. EN ISO 17249, cut resistance Class 2 (= 24 m/s).
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Combination socket tool
For tensioning the chain and changing the chain, bar and spark plug. Width across flats: 19 (for MS 261 up), 19-13 (for MS 271, MS, 291, MS 311, MS 391), 19–16 (for MS 170, MS 171, MS 180, MS 181, MS 193 C, MS 211, MS 231, MS 241, MS 251), 16 and 13 ( for MS 150, MS 201, MS 201 T).
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Multi-function tool
Practical, multi-function quality tool in a sturdy plastic case. 3.5 mm flat-blade screwdriver for carburettor adjustment and cleaning grooves, Torx® TX 27 screwdriver, nylon pouch with belt loop. Width across flats 19-13 for MS 271, MS 291, MS 311 and MS 391, width across flats 19-16 for MS 170, MS 171, MS 180, MS 181, MS 193 C, MS 211, MS 231, MS 241 and MS 251.
Versions
- Multi function tool, size across flats 19 - 13
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STIHL Smart Connector
The STIHL Smart Connector forms the basis for using all STIHL connected functions. These functions can be used via both the STIHL connected App and the STIHL connect Portal. Once correctly attached to a STIHL power tool or another manufacturer’s power tool, the STIHL Smart Connector records operational hours while the machine is running, stores them and transmits them to your smartphone via Bluetooth as soon as it is within range. The data received in the STIHL connected App is transferred to the STIHL Cloud when there is an internet connection. The data is stored there in compliance with data protection regulations. The STIHL connected App and STIHL connected Portal allow you to access your power tool data at any time. STIHL connected opens up new avenues for professional users to obtain a convenient and transparent overview of their own power tool fleet. At the same time, STIHL connected provides information including operational hours, power tool status including reminders of overdue maintenance, the last known location, and whether or not the power tools are currently nearby. For professional users, this means improved digital fleet management, more efficient processes within companies, and even closer contact with STIHL dealers. Private users can also use the system to keep an eye on their power tools and carry out maintenance at the right time.
Technical specifications Value Dimensions (l x b x h) 53 x 42 x 14 mm Signal range ca. 10 m Running time per battery charge ca. 1 Year Connectivity BLE 4,2 Battery 3V CR 2.032 Weight 20 g -
Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.