MS 251 WOOD BOSS® - $329.95 DSRP

Distributor Suggested Retail Price 18 in. Bar DSRP:  $329.95


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

The STIHL MS 251 WOOD BOSS® Chainsaw is powerful, fuel-efficient and easy to use. Ergonomically designed to bring you maximum comfort during use, this tool produces 50 percent less emissions (as compared to previous models) for a smaller impact on the environment. The MS 251 WOOD BOSS® packs features like a Master Control Lever™ and easy-to-refill fuel and oil tanks, so you can worry less about st...Read More
Print Spec Sheets
MS 251 WOOD BOSS® Specifications
DISPLACEMENT 45.6 cc (2.78 cu. in.)
ENGINE POWER 2.2 kW (2.95 bhp)
POWERHEAD WEIGHT 4.9 kg (10.8 lbs.)
FUEL CAPACITY 390 cc (13.2 oz.)
CHAIN OIL CAPACITY 198 cc (6.7 oz.)
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 depending upon which powerhead it is installed.
Model Features
  • Zoom
    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.

    More Information

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

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.
Click to view the STIHL Limited Warranty Time Periods
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    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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    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 Number
    Sharpening Kit
    Part Number
    in. mm in. mm Part Number
    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

    5605 007 1026

    3/8 PM
    5/32 4.0 0811 411 8091

    5605 750 4327

    5605 007 1027

    0.325 8.25 3/16 4.8 0811 412 8088

    5605 750 4328

    5605 007 1028

    3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329

    5605 007 1029

    0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330

    5605 007 1030

For Your Safety
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    The lightweight STIHL Woodcutter Helmet System is an excellent choice for budget-conscious non-professional users with chainsaws and pole pruners. Designed for comfort, the vented shell provides cooling air during use, and the 6-point mount suspension provides comfortable support. The STIHL Woodcutter Helmet System is Class G certified and includes NRR 22 hearing protection.
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    Innovative keyed thumb stitching for super comfort and gripping ability. Sizes available S, M, L, XL.

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Rated 4.3 out of 5 by 167reviewers.
Rated 5 out of 5 by If it's not STIHL, it's not real !!!!!!! I only use stihl equipment and purchased my first saw eight years ago which was a ms210, it has always functioned properly and is still running well. However I decided to upgrade to a larger saw today, I purchased the ms251 wood boss. Smith Chapel supply is a phenomenal dealer and is very pleasant to work with. They fueled up the saw and ensured that I was familiar with it before I left the store. When I got home it fired up on the first pull and cut threw the trees with ease. I ran the saw hard for a few hours today and was impressed with the power of this saw. "If it is not stihl, it is not real" !!!!!!! October 14, 2016
Rated 4 out of 5 by ms251 Wood Boss (without the easy start) Bought this saw 5 months ago, first time saw owner, grew up helping my Dad cut trees, just never handled the saw, got minimal saw experience as I got older.I had a real hard time getting it started the first time, the store of purchase had shown me how to start it initially, but it was a week before I got to use it, so had forgotten. Between my buddy and I, once we got it running, it ran like a champ, start and stop all day, one pull fired up!...though it hemorrhaged oil.Upon closer inspection, I noticed the piece that the bar attaches to, wasn't recessed enough, a couple of nuts tightened together ran it down flush, no more oil spill! (I blame the assembly at the store, not Stihl for this!)About a month later, pulled the saw back out, could not get it started! Wore myself out pulling! (...again, this does NOT have the easy start sys.) Read the instructions, did everything they said, (completely forgetting AGAIN!!! my in-store advice!) Turned to Youtube, found the proper way to start it there, got up the next morning and it fired right up, had totally flooded it!Again, after that it ran all day without a hitch, start and stop one pull!I thoroughly enjoy running this saw, now that I've worked out the kinks, it's amazing!Easy to adjust, light weight, doesn't wear you out running it all day, and very affordable.My only other gripes would be that the supplied tool doesn't fit the spark plug, (found that odd!) and the case is extra. October 14, 2016
Rated 5 out of 5 by Great all around saw I have had this saw for almost a year now. Between light trimming and cutting around my house and clearing fallen trees on my land up north it has been a great saw. It is well made, reliable, easy to start/use and is a good looking saw. I have always run stihl moto mix through the saw as I don't use it often enough that it breaks the bank. Plus it is always good to know you are using quality fuel with stabilizer included.One thing that I will note which other places don't do. A stihl dealer will fill the saw with fuel/oil mix as well as bar oil and start it up for you right then and there. They will also adjust/tune if needed. I can't say the same for other retailers... October 12, 2016
Rated 1 out of 5 by don't buy an MS 251 When I picked it up at the store it wasn't putting much oil on the chain. The store representative said it would need some time to get the oil going. I accepted that explanation. First tank of Fuel the bar chain sprocket seized. The chain oiler is not working. I returned it to where I got it. Mechanic there said he cleaned wood chips from the oiler outlets and to try it again. I did and it still does not put oil on the chain. Returned to the store and they sent it to Stihl for repair. Stihl changed the oiler and sent it back still not oiling per the manual. Oil pours out of the bottom but very little gets to the chain. I'm using Stihl bar oil and their per moved gas. I had the store pull a new one out of the box and test it and it was not oiling the per the manufacturers manual. I have a new saw, less than two tanks of fuel through it and I can't use it. The first sudden stoppage of the motor I'm sure did damage. I'm using Stihl bar and chain oil. First premium and now the wood cutter oil October 12, 2016
Rated 5 out of 5 by Great saw Bought this saw this morning after a hurricane to cut trees that fell in my hunting club. I'm 8 thick pine trees into the day and it's running like a champ. Easy to use, powerful, and lightweight. October 10, 2016
Rated 5 out of 5 by Used a year now I have used this saw for a year now and it works flawlessly. I heat with wood so I have put this tool through a work out. Best saw for the money hands down. October 8, 2016
Rated 5 out of 5 by Great power and lightweight Just what I was looking for in a smaller saw very well balanced and much lighter than my bigger saws very pleased with the 251 wood boss September 28, 2016
Rated 5 out of 5 by Smooth, powerful, not too heavy Power and balance with an 18" bar make this saw a pleasure to use. Can run for hours without fatigue and it's the easiest starting saw I've owned. Easy on fuel too. September 28, 2016
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