Selection Petrol chainsaws for agriculture and horticulture

MS 391 Petrol Chainsaw

Excellent chainsaw for heavy agricultural use

Overview

Easy-to-manage, high-torque chainsaw for improved performance and user comfort when harvesting wood or sawing firewood. High torque over a wide range of speeds. Up to 20% less fuel consumption and up to 50% lower emissions compared with the previous model without 2-MIX technology.

Instruction is necessary to recognize or assess the dangers of a chainsaw. Please wear protective clothing and equipment.
If anything is unclear, we recommend to order the chainsaw via Click & Collect and pickup up the chainsaw from a STIHL servicing dealer.

You can find videos showing you how to fill your machine with fuel and oil, fit bars and chains and start your chainsaw here.

£924.00*

Versions

Price

* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Technical data

MS 391

Technical data

Technical data Value
Displacement cm³ 64.1
Power output kW/bhp 3.3/4.5
Bar length cm 40-50
Bar length " 16-20
Weight kg 1) 6.2
Weight kg 2) 7.28 / 7.51 / 7.68
Power-to-weight ratio kg/kW 1.9
Sound pressure level dB(A) 3) 105
Sound power level dB(A) 3) 117
Vibration values left/right m/s² 4) 4/4
STIHL Oilomatic saw chain pitch/type 3/8" RM
STIHL Oilomatic saw chain pitch/type 3/8 "
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
Filter material Flocked
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
Exhaust Standard muffler
Carburettor Compensator / Limiter Caps / scavenging / Carburetor
Speed at maximum power rpm 9.500
Additional features Ematic chain lubrication system
EPA Certified fuel consumption glh 0.47

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

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Features

MS 391

Standard features

  • Decompression valve Zoom
    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 Zoom
    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 Zoom
    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 Zoom
    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 Zoom
    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 Zoom
    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 Zoom
    Single-lever master control

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

  • Side chain tensioner Zoom
    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 Zoom
    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 Zoom
    Tool free filler caps

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

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Cutting Attachments

MS 391

Cutting Attachments

    • Rollomatic E Zoom
      Rollomatic E

      The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.

    Technical data Value
    Bar length 40cm/16",45cm/18",50cm/20"
    Sprocket pitch 9.32mm/3/8"
    Number of teeth on the sprocket 10
    Pitch 3/8 Inch
    Groove width 1.6 mm
    Groove width 1.6mm/.063"
    Number of teeth 10
    Bar type Stern-Rollomatic
    Bar connection 3.003

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Rollomatic E Zoom
      Rollomatic E

      The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.

    Technical data Value
    Bar length 40cm/16",45cm/18",50cm/20"
    Sprocket pitch 9.32mm/3/8"
    Number of teeth on the sprocket 10
    Pitch 3/8 Inch
    Groove width 1.6 mm
    Groove width 1.6mm/.063"
    Number of teeth 10
    Bar type Stern-Rollomatic
    Bar connection 3.003

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Rollomatic E Zoom
      Rollomatic E

      The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.

    Technical data Value
    Bar length 40cm/16",45cm/18",50cm/20"
    Sprocket pitch 9.32mm/3/8"
    Number of teeth on the sprocket 10
    Pitch 3/8 Inch
    Groove width 1.6 mm
    Groove width 1.6mm/.063"
    Number of teeth 10
    Bar type Stern-Rollomatic
    Bar connection 3.003

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Micro (RM) Zoom
      Rapid Micro (RM)

      Good all-round comfort chain with low vibration levels, smooth cutting behaviour and low chatter.

    Technical data Value
    Pitch 3/8 inch
    Drive link gauge 1.6 mm
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Micro (RM) Zoom
      Rapid Micro (RM)

      Good all-round comfort chain with low vibration levels, smooth cutting behaviour and low chatter.

    Technical data Value
    Pitch 3/8 inch
    Drive link gauge 1.6 mm
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Rapid Micro (RM) Zoom
      Rapid Micro (RM)

      Good all-round comfort chain with low vibration levels, smooth cutting behaviour and low chatter.

    Technical data Value
    Pitch 3/8 inch
    Drive link gauge 1.6 mm
    Drive link thickness 1.6mm/.063"
    Chain pitch 9.32mm/3/8"
    Required File size 5.2mm / 13/64"

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Accessories

MS 391

Accessories

    • HP Super 2-stroke engine oil Zoom
      HP Super 2-stroke engine oil

      Semi-synthetic oil with low-ash additives for clean low-smoke burning. 'Low-smoke oil' performance class: JASO-FD, ISO-L-EGD. Fuel/oil ratio: 50:1. Particularly recommended for STIHL 4-MIX engines. Recommended for STIHL 4-MIX engines.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • MotoMix Zoom
      MotoMix

      STIHL MotoMix is our patented premixed fuel, specially blended for ultimate performance.

      This 50:1 ready-mixed fuel is a combination of premium non-ethanol, high-octane motor fuel for all STIHL 2-stroke engines which gives you optimum performance, excellent cold start properties, maximum acceleration over the entire rpm range and perfect running characteristics even with a sudden rev change.

      MotoMix uses STIHL HP ultra-premium oil for exceptional engine lubrication and extreme cleanliness. It’s fully synthetic and biodegradable for optimal performance and long service life. MotoMix is user- and engine-friendly thanks to fewer emissions (free from ethanol; almost no olefins and aromatic compounds).

      Can be kept in storage for up to five years.

      Did you know:

      • For MotoMix drums (55 l & 200 l), speak with your nearest STIHL Approved Dealer about direct delivery of the fuel to your preferred address. Find out more about our MotoMix promotion here.

      Patent EP 2031043


    Technical data Value
    Octane number >95 RON
    Octane rating 93 MOZ
    Benzene content 0.03 % Vol.
    Sulphur content 3 mg/kg
    Shelf life up to 5 Years
    Density at 15°C 690 kg/m3
    Olefin content 0.1 % Vol.
    Vapour pressure at 40 °C 61 kPA
    Two-stroke oil content 1.8 % Vol.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Metal sawhorse Zoom
      Metal sawhorse

      Robust design. Chain with spring tensioning secures the trunk for cutting, max. load 100 kg.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • Chainsaw bag Zoom
      Chainsaw bag

      Made from sturdy nylon. For safe storage and transport of all chainsaws with bar lengths up to 45 cm / 18". With small additional pocket for accessories.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • 2-in-1 EasyFile Zoom
      2-in-1 EasyFile

      Practical tool for quickly sharpening the teeth and depth gauge in a single action, significantly reducing chain maintenance time. The sturdy frame allows for a smooth filing action with highly accurate results. All the files are easily replaceable. For 1/4" P, 3/8" P, .325", 3/8" and .404" saw chains. Includes round and flat files.

      To find out how to sharpen your chain and depth gauge with the EasyFile, click here.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

    • BioPlus chain oil Zoom
      BioPlus chain oil

      Particularly eco-friendly with outstanding lubrication and adhesive properties. STIHL BioPlus is derived from plants and completely decomposes in the ground within a short space of time (tested according to OECD 301 B). It has been awarded the German 'Blue Angel' ecology mark and the European Eco-Label.

    Versions

    Price

    * Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.

Documents

Owners manuals and safety brochures

Languages Date Link
manual icon en 28/03/2022