MS391 Chainsaw (20")
AA5787
Description
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.
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.
Technical specifications
Displacement 64,1 cm³
Power output 3,3/4,5 kW/bhp
Weight 1) 6,2 kg
Power-to-weight ratio 1,9 kg/kW
Sound pressure level 2) 105 dB(A)
Sound power level 2) 117 dB(A)
Vibration level left/right 3) 4/4 m/s²
Saw chain pitch 3/8"
STIHL Oilomatic saw chain type Rapid Micro (RM)
Delivery
All orders received Monday to Friday will be dispatched the following working day. Orders received Saturday & Sunday will be dispatched the next working day. Subject to stock availability.
Most deliveries will be made by Royal Mail, but for larger and heavier items an alternative courier will be used. We pay for a next working day courier service to UK mainland but unfortunately couriers don't guarantee this so extra time must be allowed. Delivery to the Highlands and Islands takes up to an extra 2 days. Delivery will be attempted according to the terms and conditions of the courier. Any subsequent delivery attempts or refusal is the responsibility of the customer and as such all charges incurred by us will be passed on to the customer.
Returns
Goods can be returned to us within 14 days of purchase, in their original packaging and in saleable condition, for a full refund or exchange for the following reasons:
- If the product is faulty (an inspection will be carried out)
- If the wrong item has been dispatched
- If you have ordered the wrong item. Please note that as per the UK’s Distance Selling Regulations the cost of return postage is at your own expense.
If you wish to return goods, please email us through our contact us page to arrange their return, or telephone us on 01704 542894.
Please include a note stating your name, address, telephone number and reasons for the return or details of the exchange required. Failure to do this will result in a delay processing your return.