The STIHL MS 661 C-M is an extremely powerful professional chainsaw designed for the toughest forestry and timber harvesting work. With its robust build, high torque, and advanced electronic engine management, it is the ideal choice for felling and processing large trees.
 
MS 661 C-M is used in the STIHL TIMBERSPORTS series.
 
At the heart of the MS 661 C-M is the STIHL 2-MIX engine, which delivers 5.4 kW of power while reducing fuel consumption and exhaust emissions to comply with strict EU Stage V regulations.
 
Combined with STIHL M-Tronic, the fully electronic engine management system, the saw automatically adjusts ignition timing and fuel metering to match external conditions such as temperature, altitude and fuel quality. This ensures reliable performance, optimum power delivery and excellent acceleration at all times. The stop function and single start position make operation straightforward, while the decompression valve eases the starting process by reducing the pulling force required.
 
Durability and efficiency are built into every part of this saw. The HD2 filter with PET material keeps out even the finest dust, while its oil- and water-repellent surface makes it easier to clean and extends filter life. A compensator system in the carburettor keeps engine performance consistent even as the filter becomes dirty, reducing the need for frequent maintenance.
 
For comfort during long working hours, the STIHL anti-vibration system minimises vibrations transmitted to the hands and arms, significantly reducing fatigue. Everyday handling is simplified with side-mounted chain tensioning, captive nuts on the sprocket cover, and tool-free fuel and oil caps for quick refills. The controlled-delivery oil pump and STIHL Ematic system ensure precise chain lubrication, reducing oil consumption by up to 50%, while allowing extra oil flow when needed for longer bars or challenging conditions.
 
With its exceptional power-to-weight ratio, low-vibration design and advanced electronic control, the MS 661 C-M is built to handle demanding professional use in forestry and big timber harvesting with reliability and efficiency.