STIHL MS 171 Vs MS 251 : Which is worthy to buy?

STIHL MS 171 Vs MS 251: The MS 171 and MS 251 are both lightweight chainsaws that can cut through small trees and limbs. However, there are a few differences between them. We will explore these differences below, so you know exactly what to expect from these products.

Detail Comparison

Technical specifications MS 171 MS 251
Displacement ­cm³ 31,8 45,4
Power output ­kW/bhp 1,3/1,8 2,3/3,1
Weight ­kg 4,3 1) 4,6 1)
Power-to-weight ratio ­kg/kW 3,3 2
Sound pressure level ­dB(A) 99 2) 99 2)
Sound power level ­dB(A) 112 3) 111 3)
Vibration level left/right ­m/s² 4/4,5 4) 5,7/6,8 4)
Saw chain pitch ­ 3/8″P 3/8″P
STIHL Oilomatic saw chain type ­ Picco Micro Mini 3 (PMM3) Picco Micro 3 (PM3)


The STIHL MS 171 chainsaw is the perfect entry-level machine for homeowners with light woodcutting needs. It features a low-emission engine and delivers 30% less fuel consumption than our MS 180 C-BE chainsaw, without sacrificing power. The MS 171 is also extremely easy to start, with the STIHL Easy2Start™ system that eliminates the need for a strong pull of the starting cord.

STIHL MS 251 chainsaw has been around for a long time, and it’s no surprise why: professional quality at an affordable price. With its compact design this machine really packs a punch. With up to 20% less fuel consumption and 70% fewer emissions than previous models, it’s built to last. As you might expect, the STIHL Easy2Start™ system also makes starting this powerful saw a breeze – all you need is a gentle pull on the cord and away you go! The STIHL MS 171 can handle up to 14” bar length while the STIHL MS 251 can handle up to 20” bar length.


STIHL MS 171 Vs MS 251

With the many chainsaws in the market, it can be rather difficult to pinpoint the right tool for your particular task, especially with all the new variations of different models. After all, who has time to look through a multitude of various chainsaws? This is why you should always have an experienced professional help you decide which chainsaw is best for your needs. 

STIHL designed the MS 171 to be lighter than other saws in its class, weighing only 22 pounds. This is great for users who require a lightweight tool that they can use without getting tired too soon. Some jobs require prolonged use of a chainsaw, such as when cutting firewood or felling multiple trees in a forest. In this case, using a lightweight tool like the MS 171 will reduce fatigue and keep you going longer until you finish cutting down your trees or splitting your firewood.

STIHL MS 171 vs MS 251|Engine Displacement

The MS 171 and the MS 251 are both best chainsaws made by STIHL. The main difference between them is their engine displacement; the MS 171 has a 31.8cc engine, while the MS 251 has a 45.4cc engine. In addition to this, the MS 251 is designed to be tougher and more durable, as it’s built for professional use, whereas the MS 171 is designed for homeowner use. Engine Displacement The engine displacement of a chainsaw refers to the amount of fuel and air the saw can draw in during each cylinder cycle. In general, for chainsaws this metric is measured in cubic centimeters (cc), which indicates how many cubic centimeters of air and fuel the engine can take in at once.

The higher-displacement engines will have higher power output as well as increased fuel efficiency. Because of its larger engine displacement, the MS 251 has significantly more power than the MS 171. It also has a better fuel efficiency than the smaller saw, since its larger displacement allows it to use less fuel per cycle of combustion than what is used by a smaller-sized one. However, because of its greater power and high fuel consumption, you can expect to pay about $40 more for an MS 251.

STIHL MS 171 vs MS 251|Power output

Power output refers to a variety of different measurements used to describe how much of an engine’s power is being produced. Power output can be measured in horsepower (HP), which is the amount of power produced per minute and is the unit most people are familiar with. However, horsepower is somewhat misleading, as it doesn’t always represent the best way to compare different engines. For example, an engine may have a higher horsepower rating, but if it produces more heat or doesn’t use its power efficiently, it will not be as effective as one with a lower horsepower rating that does those things well.

So for the purpose of this article, I’m going to talk about two measurements that are both more direct and interesting ways of comparing different engines: A two-stroke engine, such as the one on a STIHL MS 251 Chainsaw , has two strokes to complete each cycle (move forward, move backwards).

STIHL MS 171 vs MS 251|Weight

At first glance, the STIHL MS 171 and STIHL MS 251 are very similar chainsaws. They have many of the same features and their price tags are also fairly similar. However, there are some key differences that make one preferable over the other in certain situations. So what’s the difference between these chainsaws? Weight is one of the biggest differences between the STIHL MS 171 and STIHL MS 251.

The STIHL MS 171 weighs in at 10.8 pounds, while the STIHL MS 251 comes in at 11.3 pounds. While this may seem like a small difference, it’s actually pretty significant when you consider that a chainsaw can be awkward to handle even with only a few extra pounds. The lighter weight allows you to maneuver into more difficult positions and work for longer periods of time without fatigue than a heavier chainsaw would allow. The power output of these saws is also different, with the STIHL MS 251 being slightly more powerful than its counterpart.

Both saws feature 2-MIX engines and excellent anti-vibration technology to ensure operator comfort even over extended periods of use, but with slightly more power behind it, the STIHL MS 251 will cut through.

STIHL MS 171 vs MS 251|Power-to-weight ratio

The STIHL MS 171 is a mid-sized chainsaw that’s packed with features to help make your work easier. Built for improved performance, it has a 30.1cc engine that delivers 1.8kW of power and weighs just 4.3kg (without fuel) – making it great for farmers, landowners and domestic users alike. The STIHL MS 251 is a mid-ranged saw that’s ideal for semi-professional use. It has an increased displacement 45cm3 engine, delivering 2.4kW of power and weighing in at 5.2kg without fuel – making it ideal for demanding jobs such as cutting firewood around the home.

The STIHL MS 171 is considered a light-duty chainsaw for residential users. It is powered by a 30.1 cc, 2-cycle engine that puts out 2.1 horsepower and is capable of cutting through wood up to 16 inches in diameter. The STIHL MS 251 is considered a mid-range chainsaw used by homeowners and professionals.

STIHL MS 171 vs MS 251|Sound pressure level

When you decide to buy a chainsaw, you should make sure that you get the best one. There are many different models of chainsaws. They have different features, and their performance varies depending on their type. You need to choose which one is right for you, so that you can get the most out of your purchase.

We will compare the STIHL MS 171 vs MS 251 to help you decide which model is better suited for your needs. If you’re looking for a chainsaw with high performance and great value, then the STIHL MS 171 is probably the best option. It has an 18 inch bar and chain and can easily handle any job you throw at it. It’s lightweight too, making it easy to operate without getting tired. If you’re looking for something more powerful and expensive, then the STIHL MS 251 might be right up your alley! The STIHL MS 251 has a 24 inch bar and chain and can cut through thick branches with ease.

STIHL MS 171 vs MS 251|Sound power level

When it comes to your chainsaw’s engine, sound power level (SPL) is probably the most important spec to look for when shopping for a new model. A chainsaw’s engine needs to be able to comfortably handle the work you need it to do—so if you’re cutting down trees or felling a tree, it needs to have plenty of power in the form of high SPF that will cut through the wood easily and quickly. That’s what the MS 171 is all about: higher SPF than other models in its category.

But when comparing your MS 171 with a MS 251 , there are a few things to keep in mind. The MS 251 has a higher SPF rating since it comes with an extra engine speed—that means more power and faster start-up times in high-SPF mode. The MS 251 also has an extra blade—the 5th blade—which can be used for either high-SPF or fast-cutting work, depending on which position you put it into.

Not all gas chainsaws are created equal. The MS 171 and MS 251 may look very similar, but they have quite different performance specifications. So what’s the difference? The MS 171 and MS 251 are both DEWALT gas-powered chainsaws designed for professional use, though the former is generally more suited for homeowners, thanks to its lighter weight and overall lower price point. But even in its less expensive form, the MS 171 packs a lot of power and can handle many types of cutting jobs, while the MS 251 is better suited to commercial work.

STIHL MS 171 vs MS 251|Vibration level left/right

The STIHL MS 171 and MS 251 chainsaws are both efficient, powerful tools for tackling tough jobs, but they have a few differences that make each one better suited for certain needs. With the MS 171, you get an extremely lightweight chainsaw with excellent power-to-weight ratio while the MS 251 is slightly heavier and more powerful with an increased fuel capacity that makes it suitable for larger jobs. Both are excellent choices and will help you get your toughest tasks done quickly and efficiently. However, this comparison is really all about the numbers. The STIHL MS 171 weighs in at 6 pounds, which is two pounds lighter than the STIHL MS 251.

This may not seem like much of an advantage until you’ve been using a chainsaw all day. Its light weight makes it easier to handle without sacrificing power, so you’ll be able to work longer with less effort and fatigue. And, because it’s so lightweight, the MS 171 is perfect for smaller jobs—you’ll be able to easily maneuver it around branches or other obstacles that could trip up a heavier saw. With its larger fuel capacity, the MS 251 can run about 20 percent longer before needing a refill than the MS 171 can. 

STIHL MS 171 vs MS 251|Saw chain pitch

The STIHL MS 171 is part of the Farm & Ranch series of chainsaws, which are designed to make quick work of tougher jobs. The MS 171 comes with a shorter guide bar (16 inches) than the MS 251 (18 inches), meaning it can cut through smaller branches and trees. It’s a more lightweight saw, weighing in at 11.3 pounds, compared to the MS 251’s 13.9-pound weight. This makes it easier to handle for people who might not be used to using a chainsaw on a regular basis.

The MS 171 is also CARB-compliant, meaning that its emissions are within allowable limits set by the California Air Resources Board. If you live in California or another state with similar guidelines, this means that your chainsaw may be legally required to have low-emission levels—so if you’re looking for something that will pass those requirements, the MS 171 is an excellent choice. Both the MS 171 and the MS 251 come with STIHL Quickstop inertia chain brakes and anti-vibration systems that keep your hands steady while you work, so there are no safety compromises when choosing between these models. 

STIHL MS 171 vs MS 251|STIHL Oilomatic saw chain type

The STIHL MS 171 is a lightweight, easy-to-use chainsaw that’s perfect for cutting firewood or felling trees up to 12 inches in diameter. Like all STIHL chainsaws, it features anti-vibration technology and a master control lever that acts as both an ignition switch and choke. The MS 171 also features an ergonomic rear handle that helps you safely guide the saw while making cuts, and a high-tech polymer housing that keeps the saw lightweight while also providing durable performance.

The MS 251 is an excellent chainsaw for cutting firewood or felling trees up to 20 inches in diameter. It features the same anti-vibration technology and ergonomic rear handle as the MS 171, but includes additional convenience features like a side access chain tensioner for quick adjustments on the go, and a master control lever with separate ignition switch and choke settings for easier starting. It also includes an advanced carburetor technology for superior engine performance at any altitude, so you can cut wherever your work takes you.

STIHL MS 171 vs MS 251|Which is much better?

STIHL has established itself as a leader in the field of outdoor power tools. They have some of the best chainsaws available on the market, and two popular models are the MS 171 and the MS 251. Choosing between them can be difficult because they are both light, powerful, and feature-rich.

However, there are some differences that you should be aware of before making your choice. Both of these models are ideal for property owners who want to trim trees, cut firewood, or remove dead trees. The MS 251 is slightly more powerful than the MS 171—you’ll notice this particularly in cutting larger trees—but it’s also more expensive by about $70.

If you don’t need to use a chainsaw on a regular basis, then purchasing one at less cost might be your best option. On the other hand, if you’re a professional landscaper or run a tree service company and plan to use your saw daily, then investing in a better model might be an economical decision over time. The MS 251 is also made with higher quality components than the MS 171, which gives it greater durability. The STIHL MS 171 weighs only 8 pounds without fuel or bar oil and has enough power to cut through medium-sized branches and small.


Both saws feature an anti-vibration system as well as a side-access chain tensioner to make adjustments easy, and they also feature STIHL’s quick stop inertia chain brake to protect operators in case of kickback. The fuel tank holds 11.3 ounces on both models, providing up to 45 minutes of run time per fill-up at max power output (rated at 13,500 RPM).