STIHL MS661 C-M Petrol Chainsaw

The STIHL MS 661 C-M Petrol Chainsaw is an extremely powerful professional forestry chainsaw engineered for the toughest felling, harvesting and large timber processing applications. Designed for professional forestry workers and timber harvesting operators, this high-performance chainsaw combines exceptional cutting power with advanced engine management technology and outstanding durability for intensive daily use.

Powered by STIHL’s advanced 2-MIX engine technology and intelligent M-Tronic electronic engine management system, the MS 661 C-M delivers maximum torque, rapid acceleration and optimised engine performance in all working conditions. Widely recognised as the competition chainsaw used in the STIHL TIMBERSPORTS® series, it is built to perform in the most demanding professional forestry environments.

Key Features:

Extremely Powerful Professional Forestry Chainsaw – Designed for heavy-duty forestry, felling and large timber harvesting applications.

High-Performance STIHL 2-MIX Engine – Delivers exceptional cutting power with improved fuel efficiency and reduced exhaust emissions.

STIHL M-Tronic Electronic Engine Management – Automatically adjusts ignition timing and fuel metering for optimum engine performance in all operating conditions.

Outstanding Power-to-Weight Ratio – Lightweight construction for its performance class improves manoeuvrability and reduces operator fatigue.

Professional Large Bar Compatibility – Suitable for long guide bars for felling and processing large timber.

HD2 Air Filtration System – Heavy-duty professional filtration system improves engine protection and extends service intervals in dusty forestry environments.

Variable-Displacement Oil Pump – Adjustable oil delivery system reduces chain oil consumption while maintaining effective lubrication.

Advanced Anti-Vibration System – Reduces vibration transfer to the handles for improved comfort during prolonged operation.

Side-Mounted Chain Tensioning – Allows fast and safe chain adjustment while keeping hands away from the chain.

Manual Decompression Valve – Reduces compression pressure during starting for easier and smoother engine starting.

Captive Nut Sprocket Cover – Prevents loss of nuts during maintenance and chain adjustments.

Ideal For:

• Professional forestry work
• Felling large trees
• Timber harvesting operations
• Heavy-duty woodland management
• Chainsaw milling applications
• Intensive professional cutting work

Product Details:

Product Type: Professional Petrol Chainsaw
Power Source: STIHL 2-MIX petrol engine
Operation: Petrol powered
Application: Professional forestry and large timber processing
Displacement: 91.1 cm³
Power Output: 5.4kW / 7.3HP
Weight: 7.5kg (without guide bar and chain)
Recommended Bar Length: 63cm – 90cm / 25" – 36"

Why Choose This Chainsaw:

The STIHL MS 661 C-M Petrol Chainsaw is designed for professional forestry operators who require maximum cutting performance, durability and reliability for the most demanding timber harvesting applications. Its powerful 91.1cc engine delivers exceptional torque and cutting speed, making it ideal for felling and processing large hardwood trees and heavy timber.

The advanced STIHL M-Tronic system continuously monitors engine operating conditions and automatically adjusts fuel metering and ignition timing to maintain optimum performance regardless of temperature, altitude or fuel quality. This provides consistent power delivery, improved throttle response and simplified operation without manual carburettor adjustment.

Despite its immense cutting power, the MS 661 C-M maintains an impressive power-to-weight ratio, helping improve manoeuvrability and reduce operator fatigue during prolonged forestry work. The anti-vibration system and ergonomic design also enhance comfort during intensive daily use.

Professional users frequently praise the MS 661 C-M for its enormous cutting power, reliability and suitability for long-bar applications and chainsaw milling. Many forestry professionals consider it one of the best large-capacity professional chainsaws available for heavy-duty timber work.

Product Information:

As with all STIHL professional forestry chainsaws, the MS 661 C-M is packed with advanced features:

• STIHL 2-MIX low-emission engine technology
• STIHL M-Tronic electronic engine management system
• HD2 heavy-duty air filtration system
• Variable-displacement oil pump
• STIHL anti-vibration system for improved comfort
• STIHL Ematic chain lubrication system
• Side-mounted chain tensioning system
• Manual decompression valve for easier starting
• Captive nut sprocket cover
• Tool-free fuel and oil filler caps
• Professional magnesium crankcase construction
• Optimised balance for improved handling
• Durable construction for intensive forestry applications
• Competition-grade performance used in STIHL TIMBERSPORTS® events

The STIHL MS 661 C-M is the ideal choice for professional forestry workers, timber harvesting contractors and chainsaw milling operators seeking an extremely powerful, highly durable and technologically advanced petrol chainsaw capable of delivering exceptional cutting performance in the toughest professional forestry environments.