MS 661 C-M
Extremely powerful 5.4kW professional saw with STIHL M-Tronic (M)
General
Big timber saw for the toughest jobs in forestry. The M-Tronic guarantees optimum engine performance at all times, while its single start position and stop button function mean easy starting. Controlled-delivery high-performance oil pump for conveying high quantities of oil; HD2 filter with very good filter effect, economical 2-MIX engine.
Versions
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MS 661 C-M, Bar length 50cm
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MS 661 C-M, RS, Bar length 63 cm
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MS 661 C-M, 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 W Extremely powerful 5.4 kW professional saw with STIHL M-Tronic (M) and heated handles (W)
Technical specifications

Technical specifications
Technical specifications | Value |
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Displacement | 91,1 cm³ |
Power output | 5,4/7,3 kW/bhp |
Weight 1) | 7,4 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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STIHL Smart Connector
The Smart Connector can be attached to petrol-driven, electric, and cordless products, enabling it to deliver important information about your STIHL power tool via Bluetooth® 4.2. The Smart Connector offers entirely new functions and services, as a basis for device management both in your home garden using the STIHL connected app, and for managing your machine fleet using the STIHL connected Portal.
Technical specifications Value Weight 20 g 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 -
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ROLLOMATIC ES LIGHT, 3/8", 1,6 MM
Lightweight version of the STIHL Rollomatic ES, made from hard-wearing special steel. The hollow centre is cut out and then welded using a special laser process. This produces an extremely stable hollow body with a flexible outer and substructure. The result is a weight saving of some 30% compared with Rollomatic ES guide bars.
Technical specifications Value Bar length 71cm/28",80cm/32",90cm/36" Pitch 9,32mm/3/8" Number of teeth 11 Groove width 1,6mm/.063" Versions
- Length 71 cm / 28"
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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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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.