Stihl MS391 18" Chainsaw

The Stihl MS391 18" Chainsaw features a high torque version of the Stihl 2-MIX Engine, a long-life air filter system and decompression valve for effortless starting. This is an ideal saw for heavy agriculture use and felling and sawing large firewood.  

Decompression valve - The decompression valve is part of the easy starting system. The valve should be pressed before starting to reduce the compression pressure when starting, as well as reducing the effort needed to pull the starter rope. The decompression valve is semi-automatic; it must be pressed manually before starting, but then closes automatically.

Reduced-emission engine technology - 2-stroke engine with stratified charge. A fuel-free layer of air is created between the burned charge in the combustion chamber and the fresh charge in the crankcase, reducing the amount of fuel lost during the charge cycle. This results in more power with a lower weight, up to 20% lower fuel consumption than regular 2-stroke engines and significantly reduced exhaust emissions.

Advanced combustion technology - Four overflow channels swirl the fuel-air mix before ignition, allowing for optimum combustion and highly efficient performance. The result is lower fuel consumption and high torque across a broad rpm range.

Compensator - This controller in the carburettor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburettor depending on the quantity of air passing through the air filter. This keeps the fuel/air ratio in the combustion mixture constant and hence also the engine power. The filter doesn't need to be cleaned until an appreciable drop in power occurs.

Pre-separation air filtration system - STIHL long-life air filtration systems with pre-separation achieve perceptibly longer filter life compared with conventional filter systems. Air drawn in is swirled. The larger, heavier particles are ejected. The pre-cleaned air is routed to the air filter via the pre-separator duct.

Anti-vibration system - Intense vibration at the handles of power tools can lead to long-term effects on blood vessels in the hands and arms. STIHL has therefore developed an effective anti-vibration system whereby the oscillations from the machine's engine are dampened which significantly reduces vibrations at the handles.

Variable-displacement oil pump - Allows a precise, demand-based delivery of oil. It's possible to reduce oil production by up to 50% in the E position. For very long cutting attachments or very dry wood, an additional volume of oil can be added by the user. similar to illustration.

Ematic chain lubrication system - The Ematic chain lubrication system ensures pinpoint lubrication of the saw chain links and guide bar rails. When used with STIHL OILOMATIC saw chain, it will provide maximum lubrication, longer wear and less oil consumption than conventional methods of chain lubrication. The Ematic system can reduce bar oil consumption by up to 50%.

Single-lever master control - All important functions such as start, choke, throttle and stop are operated via a single lever.

Side chain tensioner - The tensioning screw can be found on the side of the chain saw through the sprocket cover. This removes the need for contact with the sharp saw chain.

Tool free filler caps - Special catches on the fuel and oil tanks for easy opening and locking without the need for tools.

Model MS 391

Bar Length  18" (45cm)

Displacement 55.5cm³

Power Output 2.8kW

Weight 5.6kg

Power-to-weight ratio 2kg/kw

Sound Pressure Level 103dB(A)

Sound Power Level 116dB(A)

Vibration Values (L/R) 4.5/4.5m/s²

STIHL Oilomatic saw chain pitch/type .325" RM

Warranty 2 Years

Extend your STIHL Warranty on this product by an extra year, when you buy it with a STIHL Smart Connector. We will register this warranty extension for you if you buy, so you don't need to do anything else to extend the cover once bought. For more information please read the details here!