The STIHL MS 391 FarmBoss is a robust petrol chainsaw designed for demanding cutting tasks on farms, rural properties, and bush blocks. With a 64.1cc engine producing 3.3kW of power, it delivers strong torque and cutting performance for felling, bucking, and firewood preparation.
This model features STIHL’s advanced anti-vibration system for improved operator comfort, and a long-life air filtration system that reduces maintenance frequency. The 50cm (20″) guide bar provides extended reach and is ideal for medium to large timber.
The MS 391 includes a decompression valve for easier starting and a side-access chain tensioner for quick adjustments. It’s a reliable choice for users who need serious cutting power with STIHL’s proven engineering.

Technical Specifications:

• Engine Type: STIHL 2-MIX
• Displacement: 64.1cc
• Power Output: 3.3kW
• Bar Length: 50cm / 20″
• Weight (excluding bar/chain): 6.2 kg
• Chain Type: 3/8″ RS
• Fuel Capacity: 600 ml
• Oil Capacity: 350 ml
• Warranty: 2 years domestic / 1 year commercial (Australia)