Stihl MS 391 20" Bar Chainsaw

Stihl MS 391 20" Bar Chainsaw

The STIHL MS 391 is a robust 64 cc petrol chainsaw designed for agriculture, landscaping and forestry work. Supplied with a 50 cm (20") guide bar, it combines strong cutting performance with fuel-efficient 2-Mix engine technology, making it well suited for felling, firewood processing and general heavy-duty use.

Features:

• 2-Mix engine technology for lower emissions and better fuel economy
• Pre-separation air routing system extends filter life by removing coarse debris early
• Compensator keeps performance steady even with a partially clogged air filter
• Controlled-delivery oil pump with Ematic system for efficient chain lubrication and reduced oil use
• Tool-free fuel and oil caps for quicker refilling
• Manual decompression valve makes starting easier
• Side-mounted chain tensioner for safer, simpler adjustments
• Anti-vibration system reduces operator fatigue
• Master Control Lever combines choke, on/off, and throttle lock into one control
• High-strength polymer housing that’s lightweight yet durable

Specifications:

• Engine displacement: 64.1 cm³ (3.9 cu in)
• Engine power output: 3.3 kW (≈ 4.4 bhp)
• Powerhead weight (no bar/chain): ~ 6.2 kg (13.7 lb)
• Fuel tank capacity: 600 cc (20.3 oz)
• Chain oil capacity: 350 cc (11.8 oz)
• Chain type / pitch: 3/8" RS3 OILOMATIC®
• Recommended bar lengths: 40–50 cm (16–20")
• Typical sound level: ~105 dB(A) pressure / ~117 dB(A) power
• Approximate vibration (handles): ~4 m/s² L/R
• Power-to-weight ratio: ~1.9 kg/kW