MS 391
Mid-range chainsaw with anti-vibration system and reduced-emission engine technology.
STIHL engine technology means low fuel consumption, longer run times and reduced emissions in this high-powered chainsaw. The MS 391 features our newest engine technology that adds fuel efficiency while reducing emissions as compared to other models. Though equal in weight, the MS 391 is more powerful than the MS 311. Add to that an optimal power-to-weight ratio and you have a chainsaw that’s cut out for the big jobs in field, farm and ranch. Felling trees, cutting firewood and cleanup after the storm just got a whole lot easier with the rugged MS 391.
| MS 391 Specifications - Mid-Range Use | |
| POWER SOURCE | Gas |
| POWERHEAD WEIGHT | 13.67 lbs. |
| GUIDE BAR LENGTH (Recommended) | 20 in. |
| OILOMATIC® CHAIN | 3/8" RS3 |
| CHAIN OIL CAPACITY | 11.8 oz. |
| ENGINE POWER | 4.4 bhp |
| FUEL CAPACITY | 20.3 oz. |
| DISPLACEMENT | 64.1 cc |
| Note: STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20" 3003 008 8921 Ematic™ guide bar combination. Compatible guide bar ranges: 16" to 20" | |
Important Information
IMPORTANT SAFETY INFORMATION
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 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.
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.
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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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.
We Also Suggest
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SPECIAL OFFER
HP Ultra 2-Cycle Engine Oil
No matter how you slice it (or trim it or shred it), there’s no better protection for your high performance 2-stroke engine than STIHL HP Ultra Oil. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus “ultra” lubricating qualities that are superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We’re so confident this oil will protect your engine, we’ll double your STIHL limited warranty* when you use it. It’s that good.
*Double your warranty when you purchase either STIHL HP Ultra Oil (six pack) or STIHL MotoMix® Patented Premixed Fuel (one gallon minimum) with your STIHL product purchase. Double limited warranty protection applies to select STIHL gasoline-powered products purchased for personal non-income producing, household purposes only. Other restrictions apply. See dealer for details or refer to STIHL’s Limited Warranty Policy.
Unopened container shelf life: 4 years from the date of filling, in originally sealed containers.
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SPECIAL OFFER
STIHL MotoMix®
STIHL MotoMix® is our patented premixed fuel, specially blended for ultimate performance. Like a sports drink for your engine, this 50:1 mixture is a combination of premium non-ethanol, high-octane motor fuel and our highest-quality STIHL HP Ultra Oil. Clean and convenient, MotoMix® eliminates the hassle of mixing your own 2-stroke engine fuel while providing superior performance and lubrication. Plus, we stand behind this formulation by doubling the limited warranty when you include MotoMix® with your power tool purchase. STIHL MotoMix® contains no ethanol, allowing it to maintain stability for up to two years after the seal is broken - so it stays fresh in your equipment during long storage periods. It’s no surprise that MotoMix® is the official fuel of the STIHL TIMBERSPORTS® Series.
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SPECIAL OFFER
2 in 1 Filing Guide
The STIHL 2 in 1 Filing Guide simplifies the process of sharpening your saw chain by completing two functions at once – sharpening your saw chain cutters and lowering your depth gauges. The ease and accuracy of this unique accessory makes it the perfect system for maintenance of your STIHL chainsaw. The system includes two round files, one flat file, and comes with a unique file holder and filing guide. The STIHL 2 in 1 Filing Guide gets more done with each stroke, so you can spend less time sharpening your saw chain and more time putting your chainsaw to work.
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For Your Safety
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SPECIAL OFFER
Great Grip Gloves
Get a grip on your next outdoor project with Great Grip Gloves from STIHL. These gloves provide an enhanced grip with a micro-polymer grip pattern. Its stitched fabric construction and elastic cuff provide a great fit that is comfortable to wear all day long. These gloves are a terrific value, delivering great performance at a great price.
Materials: Stitched fabric, synthetic micro polymer grip and elastic cuff
Available sizes: M, L, XL
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SPECIAL OFFER
Dynamic Apron Chaps - 6 Layer
The Dynamic Apron Chaps feature Avertic® Pro by Engtex®, a cut-retardant material designed to reduce the risk of severe injury in the event of contact with a rotating saw chain. They are made from water- and oil-resistant Cordura® Nylon, a tough material with exceptional abrasion resistance that provides long-lasting comfort. The Performance Apron Chaps also have interlocking leg buckles to keep them in place. In addition, these chaps feature a cargo pocket for quick storage on the left leg panel as well as a 1-1/2" interlocking waist buckle that adjusts from 30” to 42” (optional waist extender, sold separately, fits waists up to 56”).
Available Color: Orange
Available Sizes: 32", 36", 40", 44"
Protective Layers: 6 Layers of Avertic® Pro by Engtex® cut-retardant material
Washable? Yes
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SPECIAL OFFER
ADVANCE X-VENT Helmet System
The ADVANCE X-VENT Helmet System offers a modern design and protective features for forestry and tree service professionals. A large, etched stainless steel mesh face shield provides excellent light transition, while the helmet system’s six-point ratchet suspension is easily adjustable for a comfortable, secure fit. The helmet shell features vents for cooling and reflective material to help locate a wearer in low light. The ADVANCE X-VENT Helmet System is Class C certified and includes NRR 25 hearing protection. At 1.8 pounds, the helmet system is a comfortable weight for all-day use.
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SPECIAL OFFER
Sleek Line II Glasses
With their lightweight design and flexible temples, these glasses provide protection without sacrificing comfort. Built to protect against 99% of harmful UV rays, these optical-grade polycarbonate lenses are designed to protect against scratches as well. The STIHL Sleek Line II Protective Glasses deliver quality protection in a frameless, single-lens construction.
Meets ANSI Z87+ Standard
Available lens colors: Blue Mirror, Smoke
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