MS 391 - $569.95 DSRP


Reserve with STIHL Express for In-Store Pick Up

Our top-of-the-line chainsaw for farm and ranch.

With an advanced low-emission engine technology, the STIHL MS 391 mid-range chainsaw improves fuel efficiency by up to 20% compared to previous models. The new air filtration system requires fewer filter changes, allowing for longer run times. Improved fuel efficiency and fewer filter changes save you time and money.

Print Spec Sheets
MS 391 Specifications
DISPLACEMENT 64.1 cc (3.9 cu. in.)
ENGINE POWER 3.3 kW (4.4 bhp)
POWERHEAD WEIGHT 6.2 kg (13.67 Ibs.)
FUEL CAPACITY 600 cc (20.3 oz.)
CHAIN OIL CAPACITY 350 cc (11.8 oz.)
GUIDE BAR LENGTHS (Recommended ranges) 40 to 50 cm (16" to 20")
STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20" 3003 008 8921 Ematic™ guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Model Features
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    Reduced-Emission Engine Technology - Caring for Nature
    The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.

    More Information

Standard Features
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    Common Features for Chainsaws
    View the features common to many STIHL chainsaws.
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    Pre-Separation Air Filtration System
    This time-saving technology boosts the efficiency of the engine’s filter system, doubling the time between air filter cleanings. Air drawn into the engine is first separated via centrifugal force, ejecting the heavier dirt particles before being routed to the air filter. This pre-separation means less dirt to be captured by the air filter, resulting in less frequent cleaning and maintenance.

    More Information

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    Anti-Vibration System
    STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
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    IntelliCarb™ Compensating Carburetor
    The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air/fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct RPM. IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel. As the air filter becomes dirty and less air is available for the carburetor, the IntelliCarb™ system adjusts the fuel flow to compensate for the decrease in air flow. This is in contrast to typical carburetors that utilize this air from the “dirty” side of the air box.
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    Side-Access Chain Tensioner
    The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.
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    Toolless fuel and oil caps with retainers
    Simply lift the lever and twist the caps to remove or tighten. There‘s no need to use a tool to tighten or loosen.

Important Information
WARNING! The occurrence called “kickback” can cause serious or fatal injury. Always read the instruction manual carefully before using your saw. STIHL uses a green and yellow color-coding system to help you select a powerhead, bar and chain combination that complies with the kickback requirements of ANSI Standard B175.1 (gasoline-powered saws) and §30 of UL 1662/ ANSI Standard B175.1 (electric chainsaws). Ask your STIHL dealer about safe operating procedures and the advantages of the STIHL Quickstop® chain brake, STIHL Quickstop® Plus (Q) additional chain braking feature, STIHL reduced kickback bars and STIHL low-kickback saw chains.

STIHL recommends the use of green reduced kickback bars and green low kickback chains on all STIHL chainsaws.
* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Click to view the STIHL Limited Warranty Time Periods
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    Replacement latches and scabbard are available.

For Your Safety
  • Forestry Helmet System Zoom
    Forestry Helmet System
    Adjustable hearing protection. Epoxy-coated full face screen. Tough ABS hard hat meets ANSI Z89.1-2003 Type 1 Class G. All parts are replaceable.

Are You Ready for a STIHL?

MS 391 is rated 4.5 out of 5 by 269.
Rated 1 out of 5 by from First stihl saw.... and last! Bought a 391 because it was the largest farm/ranch saw made by Stihl. Purchased to cut firewood. I used this unit to cut about 4 cords before it would not start. The cylinder and piston were essentially destroyed. Fuel meeting octane requirements was used in addition to Stihl 2 cycle oil. I also exsclusively use ethanol free fuel in 2 cycle engines. Unit was poorly made with badge plate falling off after 1st use. Pull rope broke several times until it was replaced with aftermarket unit. Retaining screws to hold cover on would loosen and fall out despite tightening them properly with torx bit. Oiler was erratic and prone to clogging. The dual bar nut and tensioning system worked well and was easy to use. Fuel economy was good for a saw this size and the caps for oil and fuel are the best I have seen. Starting after running out of fuel was very difficult. Power was a disappointment and I had to change the 25" bar the saw came with for 1st a 20" then an 18". I have used older model Stihl saws in the past and they were beasts cutting wood and ran like a top hour after hour. This saw does not meet those standards.
Date published: 2018-03-17
Rated 5 out of 5 by from Great Saw Awesome power never had a issue very reliable I've had mine for 3 years and couldn't ask for anything more
Date published: 2018-03-14
Rated 5 out of 5 by from How can they sell this saw for so cheap! To say I am impressed with this saw is an understatement. I have been cutting trees for a long time and had many different brands. I always thought Stihl was way to expensive, I was wrong. I bought a 180 about a month ago I was so impressed I went back for this monster when my old echo proved unable to efficiently cut the huge trees an ice storm.dropped all over our farm. This saw is a beast! It cuts big hickory trees like they are pine. It's just unbelievable how much power thia saw with a 24 in blade has. The dealer has been fantastic very good people to deal with. If your thinking about this saw you will not be disappointed.
Date published: 2018-03-13
Rated 5 out of 5 by from Best chainsaw ever had! Love this chainsaw, had several but none compared to the MS391. Lots of power, easy to use. 20in bar, I’ve cut 24in across oaks like butter. Do get the 2 in 1 file, to keep teeth sharp, you won’t have any problems.
Date published: 2018-03-09
Rated 1 out of 5 by from Stihl will not honor their warrenty Less than 90 days after purchasing a new ms391 the clutch let go. stihl would not honor their warrantee. I was told that is was caused by me running the saw with the brake on, or a really dull chain. Both of which are wrong. If it were possible to run the saw with the brake engaged, that doesn't say much about their saw brakes.
Date published: 2018-03-05
Rated 5 out of 5 by from Exactly what I have come to expect from Stihl This is my 3rd Stihl Chainsaw. I have an O41 Farmboss, an O36 and now an MS391. I have to say that this saw is impressive. It handles like my O36, but cuts like the O41. Plenty of power for a 20" bar, so if it is like the O41 it would probably handle the 24" like it wasn't even there. To be honest, I had to hold it back as it was almost too aggressive. Easy to start like all of my saws. Very well worth the money.
Date published: 2018-03-02
Rated 5 out of 5 by from This saw is a workhorse The 391 is a good priced saw with plenty of power. Power to weight ratio is great.
Date published: 2018-03-01
Rated 4 out of 5 by from Great Product Great saw, I have been very pleased so far. More importantly I was very pleased with the customer service and professionalism of the crew at Mountain Stihl in Helena, MT.
Date published: 2018-02-28
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