STIHL® MS 661 C‑M MAGNUM® – 25in Chainsaw | 91.1cc STIHL® Gas Engine

The STIHL® MS 661 C‑M MAGNUM® is a high‑output professional chainsaw engineered for extreme forestry, logging, and large‑diameter woodcutting applications. Designed for operators who demand maximum cutting strength, this MAGNUM® configuration delivers massive torque, fast acceleration, and consistent performance when running longer bars under heavy load.

Key Features

• 91.1cc gas-powered engine delivers exceptional torque for heavy‑duty felling and bucking
• 25in guide bar provides an ideal balance of reach, control, and cutting efficiency
• MAGNUM® configuration built for high‑load, continuous professional operation
• STIHL M‑Tronic™ engine management system automatically adjusts for temperature, altitude, and fuel quality
• Decompression valve reduces starting effort on the high‑compression engine
• STIHL® Anti‑Vibration System helps minimize operator fatigue during extended cutting sessions
• Pre‑separation air filtration system extends air filter life and reduces maintenance intervals
• Side‑access chain tensioner allows quick, convenient chain adjustments
• Toolless fuel and oil caps with retainers simplify refueling and routine maintenance

(Model number 1144‑200‑0337)

Why It’s a Smart Pick

The STIHL® MS 661 C‑M MAGNUM® is a smart pick for professional loggers and forestry crews who need uncompromising power in a more controlled 25in bar setup. With its massive engine output, intelligent electronic engine management, and MAGNUM®‑grade durability, it delivers reliable performance for demanding felling and bucking jobs where productivity and toughness are critical.