Description STIHL MS 391 Petrol Chainsaw – Power, Efficiency & Control for Heavy-Duty Cutting The STIHL MS 391 petrol chainsaw combines impressive torque with refined handling, making it ideal for demanding cutting jobs such as felling large trees, sectioning timber, or preparing substantial firewood. Its powerful 64.1 cc 2-MIX engine produces 3.3 kW (4.5 hp), offering exceptional cutting performance while maintaining excellent fuel efficiency. High Power, Lower Emissions Equipped with STIHL’s advanced 2-MIX engine technology, the MS 391 delivers strong power output with reduced emissions and improved fuel economy compared to older models. A pre-separation air filtration system removes larger debris before it reaches the main filter, extending engine life and keeping performance consistent over long working periods. Comfort for Extended Use Despite its robust power, the MS 391 is designed for balance and comfort. Weighing around 6.2 kg (without bar and chain), it offers an optimal power-to-weight ratio. The anti-vibration system minimises hand and arm strain, while the soft-grip handle ensures secure control — even when fitted with longer guide bars from 40 cm (16″) to 50 cm (20″). Easy Handling & Maintenance Practical features such as tool-free filler caps for fuel and oil make refuelling quick and tidy. The Ematic chain lubrication system optimises oil delivery, reducing consumption and wear. Side-mounted chain tensioning allows safe and simple adjustments, and the master control lever combines all key functions — start, choke, throttle, and stop — for straightforward operation. Durable & Reliable Design Built for tough work environments, the MS 391 features a compensator that maintains steady engine performance as the air filter becomes dirty. It runs a 3/8″ Rapid Micro (RM) chain for efficient cutting performance. With low vibration levels (approx. 4.0 / 4.0 m/s² left/right) and generous tank capacities (fuel ~0.60 L, oil ~0.35 L), you can work longer between refills. Key Features: 64.1 cc STIHL 2-MIX engine delivering 3.3 kW / 4.5 hp Excellent power-to-weight balance (~6.2 kg without bar & chain) Anti-vibration system and soft-grip handle for operator comfort 16″–20″ (40–50 cm) bar options with 3/8″ Rapid Micro (RM) chain Pre-separation air filtration for extended filter life Tool-free filler caps for quick refuelling Side chain tensioning for safe, simple adjustment Ematic lubrication system for reduced oil use and longer chain life Specification Feature Details Displacement 64.1 cm³ Power 3.30 kW Engine Power 4.50 HP CO₂ Emissions 653 g/kWh Weight (without refuelling) 6.3–7.55 kg Power-to-Weight Ratio 1.90 kg/kW Bar Length 45 / 50 cm (18 / 20 in) Saw Chain Pitch 3/8" Device Length (with bumper spike) 458 mm Sound Pressure Level 105 dB(A) Sound Power Level 115 dB(A) Vibration Level Left 4 m/s² Vibration Level Right 4 m/s²
