STIHL MS 391 Petrol Chainsaw | 45 cm
Powerful all-rounder for firewood, construction timber and landscape maintenance
Product description
For farmers, tradespeople and landscapers, the STIHL MS 391 combines high cutting performance with comfort. Its main uses are cutting firewood, landscape maintenance and cutting construction timber. The chainsaw impresses with an output of 3.3 kW (4.5 hp) and achieves an optimum power-to-weight ratio of 1.9 kg/kW, driven by an economical and powerful STIHL 2-MIX engine.
Common problems
Varied work between firewood, construction timber and landscape maintenance brings typical demands:
- Different tasks from firewood to construction timber call for robust technology with plenty of power in reserve
- Strenuous starting wastes energy with frequent starts throughout the working day
- Frequent filter cleaning interrupts the workflow in dusty conditions
Solution
The MS 391 tackles this with a powerful 3.3 kW STIHL 2-MIX engine for robust versatility, a decompression valve for effortless starting and a long-life air filter system with pre-separation for long service intervals.
Key features
- Powerful all-rounder with 45 cm RM cutting attachment
- STIHL 2-MIX engine with 3.3 kW (4.5 hp) output
- Decompression valve for effortless starting
- Adjustable oil pump for lubrication as needed
- Long-life air filter system with pre-separation for longer filter life
- STIHL Ematic system for reduced oil consumption
- Tool-free caps for oil and fuel tanks
- STIHL anti-vibration system for more comfortable working
Highlights
Powerful engine for versatile work
The 3.3 kW STIHL 2-MIX engine with an optimum power-to-weight ratio of 1.9 kg/kW handles firewood, construction timber and landscape maintenance with equal power.
Decompression valve
When starting, the valve releases some of the compressed mixture from the cylinder. This significantly reduces the pulling force needed on the starter rope and protects the starting system.
Adjustable oil pump
For very long cutting attachments or very dry wood, the oil delivery rate can be increased as needed, and reduced in other cases.
Long-life air filter system
Pre-separation removes coarse dirt particles before they reach the filter itself. With the optional HD2 filter retrofit, filter life doubles compared with previous models.
STIHL Ematic system
The interaction of guide bar, saw chain and adjustable oil pump ensures that every drop of chain oil gets where it is needed – noticeably reducing oil consumption.
Comfortable working
The STIHL anti-vibration system significantly reduces strain on arms and hands during longer work sessions.
Technical data
| Part number | 1140 200 0731 |
| Displacement | 64.1 cm³ |
| Power | 3.3 kW / 4.50 hp |
| Weight without fuel | 6.2 kg |
| Bar length | 45 cm |
| Chain pitch | 3/8″ |
| Chain type | Rapid Micro (RM) |
| Sound pressure level | 105 dB(A) |
| Sound power level | 117 dB(A) |
| Vibration value left/right | 4,0 / 4,0 m/s² |
In the box
- STIHL MS 391 petrol chainsaw
- 45 cm guide bar
- 3/8″ Rapid Micro (RM) saw chain
- Combination spanner
- Operating instructions
Frequently asked questions (FAQ)
Who is the STIHL MS 391 suitable for?
The STIHL MS 391 is aimed at farmers, tradespeople and landscapers looking for a powerful, versatile chainsaw for firewood, construction timber and landscape maintenance.
How heavy is the chainsaw in use?
The saw weighs 6.2 kg without fuel, guide bar and saw chain.
Which bar length should I choose?
40 cm is suitable for most work. If you regularly cut thicker wood or need more reach, the 45 cm version is a better choice.
What does the decompression valve do?
When starting, it releases some of the compressed mixture, noticeably reducing the pulling force needed on the starter rope.
What is included?
The chainsaw, matching guide bar, saw chain, combination spanner and operating instructions are included.
Safety information & manufacturer details
Using a chainsaw requires experience and safe handling of the tool.
Before first use, familiarise yourself with the operation and the applicable safety regulations.
Please also note the requirements for suitable protective clothing such as chainsaw trousers, safety boots, gloves and a safety helmet with face and hearing protection.
If you are unsure about operating the machine, we recommend a personal handover and instruction from an authorised STIHL dealer.
- Read the operating instructions and safety information in full before first use.
- Wear suitable personal protective equipment.
- Use chainsaws only for their intended purpose.
Manufacturer information
STIHL Vertriebszentrale AG & Co. KG
Robert-Bosch-Straße 13
64807 Dieburg, Germany
Phone: +49 6071 204-0
Email: kundenservice@stihl.de
Data use information (Regulation (EU) 2023/2854)
| Connected products | All STIHL products connected to ‘STIHL connected’. |
| Access to product data | Product data is available in the ‘STIHL connected’ application. The product must be added first. |
| Deleting the user account | When your organisation is deleted, all linked data is removed, subject to statutory retention obligations. |
| Product data collected | Operational readiness status, service information and runtime data. |
| Data format | CSV file (Excel-compatible). |
| Data volume | Less than 1 MB per connected product. |
| Collection | Continuously in real time. |
| Storage location | Cloud infrastructure of the STIHL Group. |
| Storage period | Until the organisation is deleted, taking statutory retention periods into account. |
