Stihl MS 391 Petrol Chainsaw 18 / 20 inch

The Stihl MS 391 is Petrol Chainsaw ideal for a large range of timber cutting tasks such as sectioning firewood or in timber construction. Additionally, the engine’s high torque means its capable of even the toughest of cutting tasks, yet comfortable to use and simple to start.

• Available with a 16-inch, 18-inch bar or 20-inch bar,
• Powerful engine,
• Perfect for professional use,
• Easy to use,
• 2-year warranty (domestic only)

Perfect for all wood cutting tasks, the MS 391 is the professional’s choice.

If you are looking for a professional petrol chainsaw for all those gardening tasks, then the MS391 really is the one to buy. Ticking all the boxes, it’s great for cutting down small trees, sectioning firewood, reducing bushes and shrubbery and other small sawing tasks.

Additionally, it’s super simple to control with all the operation controlled by a single lever which adjusts the starter, choke, throttle and stop. Manoeuvring the chainsaw is effortless too, being a medium weight at just under 8 kilos, will help reduce fatigue for long periods of use. Around the chainsaw is a loop-handle grip to ensure maximum control and reduce kickback.

Furthermore, Stihl has introduced an anti-vibration system to the MS391 which dampens the oscillations through the chainsaw and into the handle. This helps prevent the long term effects of stress when using power tools in the fingers and wrists. Even the starting process is less stressful, featuring the Stihl ElastoStart system, which reduces compression shock.

An economical petrol chainsaw, with inbuilt chain lubrication system.

Stihl has designed this MS 391 pro chainsaw with efficiency in mind. Benefitting from a highly powerful 2-stroke petrol engine with a 2-mix system, it results in a 20% lower fuel consumption and greatly reduced emissions compared to other 2-stroke models.

What’s more, the fuel and air ratio is controlled by an advanced compensator. This prevents the carburettor’s fuel-air mixture becoming rich in petrol and the air filter becoming clogged. Only the right amount of fuel is delivered depending on the volume of air being sucked in, resulting in constant engine power. This Stihl chainsaw also benefits from a pre-separation air filtration system, which means longer filter life.

Finally, Stihl has produced the MS 391 chainsaw with its Ematic chain lubrication system. To make the chains last longer and reduce friction, the system lubricates the saw chains links and guide bar rails, resulting in less wear and up to 50% less oil

Features We Like

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.

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.

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.

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.

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.

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.

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.

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%.

Tool free filler caps

Special catches on the fuel and oil tanks for easy opening and locking without the need for tools.

– Download PDF Manual Here (If Available)

Technical data	Value
Displacement cm³	64.1
Power output kW/bhp	3.3/4.5
Weight kg 1)	6.2
Power-to-weight ratio kg/kW	1.9
Sound pressure level dB(A) 2)	105
Sound power level dB(A) 2)	117
Vibration values left/right m/s² 3)	4/4
STIHL Oilomatic saw chain pitch/type	3/8″ RM
Oil pump	Not adjustable
Tank volume l	0.60
Chain pitch	3/8″
Chain tensioning	Side chain tension
Sprocket – number of teeth	7
Filter	Round cartridge filter
Bumper spike	Steel claw
Cylinder	Chrome
Oil tank volume cm3	350
Sprocket	Sprocket profile
Anti vibration system	Standard AV-System
Filler cap	Tools
EPA Certified fuel consumption l/h	1.779
CO2 g/kWh	755
Handle type	Standard handle
Speed at maximum power Um	9.500
EPA Certified fuel consumption glh	0.47

1) Without fuel, without bar and chain
2) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
3) K-factor according to DIR 2006/42/EC = 2m / s ²

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