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A powerful and fuel-efficient chainsaw that’s comfortable to use.

Product Description

The STIHL MS 251 WOOD BOSS® Chainsaw is designed to deliver all the power you’d expect from STIHL equipment, yet with a comfortable and ergonomic design. The MS 251 WOOD BOSS® is perfect for felling small trees, pruning and thinning, and cutting firewood simply and efficiently. And with up to 20 percent fuel savings and 50 percent reduced emissions (as compared to previous models), you can enjoy a longer run time while feeling good about your impact on the environment. Features like a Master Control Lever™ and reduced vibration make the STIHL MS 251 WOOD BOSS® a lean, easy-to-use machine that still packs plenty of power.

Model Features

  • 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.

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  • Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

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  • Master Control Lever™
    The Master Control Lever™ is an easy to use single lever, operating the choke, starting throttle lock and on-off switch. The operator must pull the throttle trigger before moving the Master Control Lever™ to the choke position.


45.6 cc (2.78 cu. in.)
2.2 kW (3.0 bhp)
4.9 kg (10.8 lbs.)
390 cc (13.2 oz.)
198 cc (6.7 oz.)
.325" RM3
GUIDE BAR LENGTHS (Recommended ranges)
40 to 45 cm (16" to 18")
STIHL recommends #3634 (26 RM3 68) OILOMATIC® saw chain and 18" 3005 008 4717 STIHL ROLLOMATIC® E guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.

Important Information

* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.

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.


MS 251 WOOD BOSS® is rated 4.3 out of 5 by 466.
Rated 5 out of 5 by from I use the heck outtavit It is fine for the firewood cutting I do annually, standing dead timber, cut to length.
Date published: 2019-10-09
Rated 5 out of 5 by from great saw -- powerful, quiet and comfortable Purchased this saw for cutting firewood. Oak, pine, sycamore and walnut. Really comfortable to use due to the anti-vibration springs in the handle and saw body. Easy to adjust chain tension with one bolt. Starts easily and runs quietly. Another great Stihl product!
Date published: 2019-10-08
Rated 4 out of 5 by from Mostly great so far Loved the features and was amazed by the dealer care. Got a full walk thru and start up at the shop.First day cut great thru many different wood types, but when dropping a small tree, the chain came off and burred up the not sharp side. It would not fit in the groove of the bar anymore.Took it into the shop and they handed me a new chain and showed me how to check the bar for any issues.I will keep on cutting.
Date published: 2019-10-07
Rated 1 out of 5 by from Works as expected, getting parts is difficult This is not a complaint about customer service, it is a heads up to prospective buyers about parts availability.I want to buy a chain, why can't I do that online? Looks like only counterfeit chains on Amazon.I went to one location nearby, (but still out of my way) - they did not have a #3634 (the recommended chain for a MS 251 Wood Boss), now I've got to guess which location (6 in a 50mile radius) _might_ have what I need. A giant waste of time.For this reason, I'd choose something other than a MS 251 Wood Boss).
Date published: 2019-10-02
Rated 5 out of 5 by from Everything I asked for. I bought this as a step up (finally) from low end saws. The only issue I have had in the first year has been flooding the saw on a hot day once. Other than that I have been chewing through wood with ease. I have cut about 8 oak and 20 softwood trees to firewood lengths with ease. Also, a couple of tasks around the house. Still very happy with my purchase. Time to head to the mountains for elk camp again!!
Date published: 2019-09-30
Rated 5 out of 5 by from Great saw This saw is great, could be a 20" bar though but, great power. I cut down 5 mesquite trees and this thing was awesome..
Date published: 2019-09-25
Rated 1 out of 5 by from Never wants to start Have used many chainsaws over my 18 years living in the Poconos in PA. Never really had any problems getting the saws to start just didn’t like the power or cheap plastic interior parts that would melt, so when my last Chainsaw burnt up I decided to spend a little more and get a StihI because I had been watching YouTube channel “Outdoors With The Morgan’s “ and they are always using Stihl saws and blowers. I bought the saw in Sept/Oct of 2018 but could not use until June of 2019 because I was recovering from shoulder surgery. First time went to use saw wouldn’t start so took it to dealer and after 1/2 hour they got it started. Since than i’ve Had it back their 2 more times with starting issues, both times they have kept for a week and told me I must have flooded it and gave it back( no charges of course) but I think there is something else wrong with the saw because 1 use later the saw won’t start again. Very disappointed I decided to spend a little more $$$$ and I get nervous just thinking about going to use saw and whether it will start or not. Have only managed to use it for cutting wood for a total of 3 to 4 hours so far!
Date published: 2019-09-17
Rated 5 out of 5 by from MS 251 Wood Boss This little saw is perfect (and priced right) for most home / personal property use. I was impressed with it's overall performance and easy maintenance and care. I would recommend the MS 251 to anyone who is looking for a lightweight, dependable chainsaw with plenty of power to handle the job.
Date published: 2019-09-16
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Standard Features

  • Common Features for Chainsaws
    View the features common to many STIHL chainsaws.

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