Stihl MS311 vs MS391

A chainsaw, often known as a chainsaw, is gasoline, electric, or battery-powered saw with teeth linked to a revolving chain that is propelled along a guide bar. There are a variety of ways to put it to use in the woods such as cutting firebreaks in the suppression of forest fires and gathering wood for the fireplace.

With STIHL chainsaws, you get the best of both worlds: innovative technology, high power, and an ergonomically perfect design. As a result of these features, both people and the environment are put under less stress.

Chainsaws from STIHL have power ratings ranging from 1.3 kW to 6.4 kW, making them suitable for a wide range of applications (1.6 HP to 8.7 HP).

To make chainsaw selection easier, in this article we have come up with a great comparison between both high-quality Stihl chainsaws, MS 311 and MS 391. Stick with us till the end and know which one you should go for.

Stihl MS 311

The MS 311 is a high-tech workhorse that offers more power and features than the MS 291. Using our new engine technology, you’ll get more fuel efficiency and longer run times. The MS 311’s fuel and oil tanks are larger as well, allowing for even more time between fills.

You’ll save money on petrol while staying productive. The MS 311’s fuel-efficient, high-powered engine means you’ll spend less time working and more time relaxing.

Stihl MS311 Stihl MS311 Vs. MS391


  • Displacement: 0 cc (3.6 cu. in.)
  • Engine Power:1 kW (4.2 bhp)
  • Powerhead Weight:1 lbs.
  • Guide Bar Lengths (Recommended ranges): 16″ to 20″ (20″ standard)
  • Fuel Capacity: 600 cc (20.3 oz.)
  • Chain Lubrication Capacity: 350 cc (11.8 oz.) OILOMATIC®
  • Chain: 3/8″ RS3



Reduced-Emission Engine Technology

The “Caring for Nature” seal from STIHL® Inc. signifies that the company’s powered goods are less harmful to the environment because they emit no or little exhaust. In the words of STIHL Inc., “low exhaust emissions” means cleaner exhaust emissions than those set by the EPA and/or California Air Resources Board.

STIHL® Quickstop® Chain Brake System

The chain stopping system on STIHL® chain saws is designed to limit the danger of harm during kickback. Designed to halt the chain’s rotation if the operator’s hand or inertia kicks back hard enough on the saw to activate it. Because to inertia, the chain can be stopped in as little as a tenth of a second at some positions.

Anti-Vibration System

Minimize the amount of noise portable outdoor power equipment makes using this solution. Reducing operator fatigue while also improving worker comfort are two key benefits of using this product.

ElastoStart™ Starter Handle

A STIHL®-only feature. The starter handle has a built-in shock absorber that makes it easy to pull the rope. There will be less of a surge in peak forces during cranking (compression). Smoothing out the grip forces after the first compression stroke.

IntelliCarb™ Compensating Carburetor

When the air filter becomes partially or completely clogged, it automatically adjusts the air/fuel ratio to keep the engine running at the correct RPM. Controls the diaphragm and fuel flow using air from the clean side of the air filter. Because a dirty air filter means less air for the carburetor, this system automatically adjusts the fuel flow to make up for the loss of air flow as needed. Typical carburetors use air from the “dirty” side of the air box, whereas this design uses air from the “clean” side.

Ematic™ Lubrication System

In comparison to conventional lubrication systems, STIHL® OILOMATIC® saw chains provide appropriate lubrication and minimal oil consumption when used. It is possible to reduce bar oil consumption by as much as 50% by using two ramps strategically placed in the guide rail to contain and direct all lubrication to sliding faces of the bar and chain links, as well as the rivets and driver holes.

Side-Access Chain Tensioner

With the guide bar adjustment screw in its usual place, this allows for easier saw chain adjustment by means of an open-ended tool such as a bar wrench.

Master Control Lever

To start the engine and turn the ignition on, all you need to do is pull one lever. Before putting the throttle in the choke position, the operator must pull the throttle trigger.

Adjustable Automatic Oiler

Allows the guide bar and saw chain lubricant to be adjusted for various bar lengths and cutting circumstances by the operator.

Bumper Spikes

Using Bumper Spikes makes cutting much easier because they help prevent pull-in and give you better control over the blade.

Spark Arrester Muffler

There are big baffles in the Spark Arrester Muffler that help with noise reduction while also containing a screen that helps with spark emission reduction.

High-Tech Polymer Housings

Technical polymer housings are lightweight, impact- and corrosion-resistant, and can take a lot of punishment before failing.

Inboard Chain Brake

Saw chain sprocket removal is simplified using an Inboard Chain Brake, which requires less maintenance.


  • When compared to earlier STIHL models, this one has better gas mileage.
  • Larger gasoline and oil tanks enable it to run continuously for extended periods of time.
  • It’s very fuel-efficient.


  • Heavy
  • Hard to maintain

This mid-range chainsaw is great for falling trees, chopping firewood, and clearing brush after storms because of its low-emission engine, which uses 10 percent less gasoline than prior versions. Changing filters is no longer necessary with the new air filtering system, which allows for longer operating durations as well.

Stihl MS 391

Despite its tank-like construction, the MS 391 boasts the emissions and fuel economy of a Prius. When it comes to limb pruning, this isn’t the saw for you. This is the one you’ll use to clear a forest of oak trees with.

It can cut through trees up to a diameter of 20 inches and has a powerful 64cc engine for quick work.

The 362 C-fuel M’s capacity is the same at 20.3 ounces. As a result, you are able to work for an extended period of time before having to refuel.

In comparison to their previous chainsaws, the German firm claims this new model is 20% more fuel-efficient and 50% less polluting. The Stihl MS 291 has the same power and ease of maintenance as its predecessors, and it will save you money and assist the environment in the process.

Since it has a low-emission engine, it’s a better choice for the environment. When compared to other models, this is one of the greatest Stihl chainsaws ever created, but its filtration system is the most outstanding part that influences your experience.

The MS 391 doesn’t only take in air and filter it like other saws. Before filtering the air, it slings big particles out using centrifugal force.

The benefit of this design is that you’ll spend less time changing your air filters and can cut through trees and logs without fear of your filter being clogged.

Power comes from the tool’s 55.5 cu hp gas engine, which generates 2.8 kW/3.8bhp. A half-liter of gas may be stored in the tank, reducing the whole weight to 12.35 lbs (5.6 kg) without the fuel, bar, or chain.

The chain pitch of the Stihl Oilomatic saw chain is.325″, and the vibration intensity is 4.5 m/s2 left/right. A 16 to the 20-inch bar is an option for this product. As we wrap up the technical statistics with the 2 kg/kW power-to-weight ratio, let’s take a closer look at some of this product’s more unique and original characteristics.

Stihl MS391 Stihl MS311 Vs. MS391


  • GUIDE BAR LENGTH (Recommended) 20 in.
  • ENGINE POWER 4 bhp
  • DISPLACEMENT 9 cu. in.



2-MIX engine

With the 2-Mix engine, Stihl promises 20 percent reduced fuel usage and a 50 percent decrease in pollutants compared to prior models. Stihl has a great explanation of how the process works, which you can see by clicking here.

Air Filtration System

To put it another way, this saw’s air filtration system consists of two different filters. It includes air circulation that separates the larger dirt particles first, so the filter doesn’t have to work as hard and may last longer between cleanings. Also available as an accessory, the HD2-Filter prevents even the smallest dust particles from entering the engine. This one can also be cleaned with water, so you won’t have to pay extra for special cleaning equipment or fluids.

Combustion Technology

The MS 291’s four overflow channels blend gasoline and air to increase chainsaw combustion and efficiency rather than using just fuel to start the engine. As a result of this, fuel consumption was lowered and torque was increased throughout a wide speed range.

Anti-Vibration System

This new chainsaw model has an extremely powerful anti-vibration technology, which greatly reduces engine oscillations by the time they reach the handles, so that STIHL can keep their customers – like you and me – safe and delighted. In layman’s terms, it implies the sawbucks you’re holding are significantly less valuable than their predecessors.


This new combustion system uses less fuel, but it also increases the possibility of an unbalanced fuel/air ratio because it has an inherently prone air filtration system. It’s at this point that the compensator comes into play, adjusting the amount of fuel that gets to the carburetor based on how much air passes through it. This aids in maintaining a steady mixture of air and fuel, as well as engine output.

Safety Measures

The MS 291’s rapid stop chain brake can stop the chain quickly and is operated by the handguard upfront. The brake immediately releases if the surface jerks enough, allowing you to go back to work quickly. Besides, it’s far preferable to lose a few seconds of productivity than a hand.

Control Lever

The single-lever master control is a highly convenient feature since it ensures that all commands from start to end are in the same location and within reach of your hand at all times. Literally.

Chain Tensioning

Check for the side-mounted tensioning screw if the chain seems a bit slack. This screw is simple to access without touching the sharp chain retaining elements. Note: It is not uncommon for chainsaw chains to be extremely tight when they are first received from the manufacturer. Before you start using your new chainsaw, be sure it’s safe to use.

Automatic Lubrication

To get the most out of your chainsaw, make sure it’s well lubricated. As a result of this process, lubricant reaches the guide rails and chainsaw links accurately and locally. In order to minimise oil consumption and other lubrication requirements by 50%, the manufacturer recommends utilising an Oilomatic saw chain.



  • It has reduced emissions.
  • It’s very fuel-efficient.
  • It has an anti-vibration system to help reduce user fatigue.
  • It’s very powerful.


  • Difficult to start
  • Chain bar is smaller

MS 311 VS MS 391


MS 311

MS 391


Black, Grey, Orange

Black, Grey, Orange

Fuel Tank

0.13 gal

0.13 gal

Chain Pitch


3.0 in

Fuel Tank Capacity


0.01 gal




13.67 lb

13.67 lb

Oil Tank

0.08 gal

0.08 gal

Bar Lenght






3100.0 W

3281.0 W

Power Source

Petrol Driven

Petrol Driven

For firewood cutting, storm cleaning, and tree removal, the Stihl MS 311 and MS 391 mid-range chainsaws are excellent options for ecologically concerned landowners, tree farms, and homeowners. As a result of the MS 311 and MS 391’s Stihl low-emission engine technology, they use 20% less gasoline and 50% fewer emissions than prior models, resulting in longer run periods and cheaper operating expenses.


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