MS 391 - $569.95 DSRP
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.
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.
Standard Features
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Common Features for Chainsaws
View the features common to many STIHL chainsaws. -
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. -
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. -
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. -
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. -
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.
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
STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
We Also Suggest
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HP Ultra 2-Cycle Engine Oil
HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.•2.6 oz. bottle makes 1 gallon mix
•5.2 oz. bottle makes 2 gallon mix
•6.4 oz. bottle makes 2 1/2 gallon mix
•12.8 oz. bottle makes 5 gallon mix
STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in. -
Bar and Chain Oil
STIHL Bar and Chain oil is formulated to adhere to the bar and chain, and to reduce wear. Special agents in the oil formulation help keep sap and pitch from clinging to the bar and chain.Available in quart and gallon bottles, 5 gallon pails and 55 gallon drums, in both summer and winter weights.
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Woodsman Chainsaw Carrying Case
Woodsman carrying case. Unique, removable bar scabbard has built-in tool holders to carry tools to the cutting site. Fits MS 170 to MS 460 M with 20" bar.Replacement latches and scabbard are available.
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Complete Filing Kits
Kits available for the following chain types: STIHL PICCO™ Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.Chain Pitch File Diameter File Guide
Part NumberSharpening Kit
Part Numberin. mm in. mm Part Number 3/8 PMN 9.32 5/32 4.0 0811 411 8073 1/4
3/8 PM6.35
9.325/32 4.0 0811 411 8091 0.325 8.25 3/16 4.8 0811 412 8088 3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329 0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330
For Your Safety
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Performance Zip Chaps - 6 Layer
The Performance Zip Chaps - 6 Layer provides a full wrap-around protection for a user’s lower leg area and are made to stand up to daily wear and tear. The outer material is crafted from durable orange Cordura® nylon fabric, an all-weather material used in a range of premium outerwear brands. Inside, the chaps feature six layers of Avertic® Pro by Engtex® cut retardant material, designed to reduce the risk or severity of injury in the event of contact with the rotating saw chain on a gasoline-powered chainsaw. For extra convenience, the chaps feature rows of zippers that run along the entire inseam of the chap, helping to ensure a comfortable fit that is easy to put on and/or remove. Visit our Dealership to see these chaps in person.
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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.
MS 391 is rated out of 5 by 273.
Rated 5 out of 5 by Scott27 from Very powerful I just bought this saw after using and echo cs520 for the last 15 years. I finally got tired of fighting with the wood I'm cutting and decided to get enough power to get the job done. This saw is much more powerful that the 50cc echo. It is heavy so it would not be the best saw to use for tree trimming or overhead work. I am a carpenter so I work with tools all day long. But put this bad boy to work on a felling a tree or bucking up big trees for firewood and boy is it your friend. I could bog the echo down easily by leaning on the saw. This one can take my weight and keep going. I am cutting red oak and maple. I can't speak to reliability but it seems like a very well made saw. If you want to spend the whole day out in the yard puttering around, this might not be for you. If you want to get it done, I highly recommend this saw.
Date published: 2018-04-01
Rated 5 out of 5 by YawhooJ from It's a monster! I put a 25" bar on mine, and use it in my granberg chain saw mill. Works great. Plenty of power. I use a ripping chain when using the saw mill.
Date published: 2018-03-31
Rated 5 out of 5 by BMX81F from Lots of power I am extremely happy with how much power this saw has. This is the reason why I went with this saw and I am very pleased.
Date published: 2018-03-29
Rated 5 out of 5 by Doug98 from Best balance of size vs. cost I've been heating with wood for seven years using my inherited Sears Craftsman saw (60 cc, 18" bar, heavy as lead) that dad bought back in 1980. Enough is enough! I wanted an upgrade and decided this was the saw for me. What a great saw! I'm running a 25" bar with chisel chain on wet hardwoods and dead Locust trees which are hard as concrete and throw sparks. The MS391 has the power to pull an aggressive chain grind through the tough stuff. It's also pretty easy on the fuel consumption which increases my cutting time and saves money over the long haul. It starts within 5 pulls hot or cold and idles smoothe. This is my second season using this beast and I've upgraded it with bigger felling dogs. My next upgrade will be a 36" bar with skip tooth chain for cutting the really big trees that seem to get blown down in the spring storms every year. Needles to say the huge power increase and weight reduction over my old Sears has made me fall in love with this saw. Now it's time to buy a gas powered splitter and retire the old splitting maul.
Date published: 2018-03-26
Rated 1 out of 5 by idaho23 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 Chris391 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 TW1234 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 Big7 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
