FS 91 R - $329.99 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $329.99

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A professional trimmer packed with features for simplified and convenient trimming.

Demanding landscapers can save time using the STIHL FS 91 R professional trimmer. With its larger fuel tank than the FS 90 R, this model provides 30% longer run times, as well as a three-step start procedure to get to work faster. Thanks to its superior air filtration and low-emission engine, the FS 91 R is a dependable tool with great maneuverability and power. Its rubberized loop handle is desig...Read More
Print Spec Sheets
FS 91 R Specifications
DISPLACEMENT 28.4 cc (1.73 cu. in.)
ENGINE POWER 0.95 kW (1.27 bhp)
WEIGHT* 5.5 kg (12.1 lbs.)*
FUEL CAPACITY 710 cc (24.0 oz.)
CUTTING SWATH 16.5"
POWER SOURCE Gas
*Without deflector and cutting attachment.
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.

    More Information

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

    More Information

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    Shoulder Strap / Carrying System
    Using a shoulder strap or carrying system helps distribute the weight of the equipment for increased operator comfort and improved maneuverability.
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    Adjustable Front Handle
    Adjusts for comfort.
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    Fully Lined Drive Shaft
    Provides smooth operation and less vibration.
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    High Tech Polymer Housing
    Housings are lightweight, withstand greater impact and are corrosion-resistant.
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    Protected Choke Lever/Knob
    Helps prevent damage.
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    Throttle Trigger Interlock
    Must be depressed before the trigger can be activated.
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    Air Filter Cover
    Easily removed for fast and easy filter cleaning or replacement.
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    Protected or Enclosed Control Cables
    Eliminate dangling and loose wires.
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    Heavy-Duty Steel-On-Steel Clutch
    Centrifugal clutch is designed to reduce slippage.
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    Protected Spark Arrestor Muffler
    Has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
Standard Features
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    Common Features for Trimmers
    View the features common to many STIHL trimmers.

Important Information
WARNING! Improper use of any trimmer/brushcutter can cause serious or fatal injury. Read, understand and follow all safety instructions in your instruction manual. To reduce the risk of injury from blade contact, circular saw blades may be used on FS brushcutters that have a limitstop, a bicycle handle and double shoulder harness and not on FS brushcutters with a "J" handle or loop handle. Other rigid blades may be used on FS brushcutters having a bicycle handle, a "J" handle or a loop handle equipped with a barrier bar. To reduce the risk of eye injury always wear proper eye protection. Always use the appropriate deflector for the type of cutting attachment, as explained in your instruction manual.
Note: STIHL engine products with the Caring for Nature logo are cleaner than EPA Standards for exhaust emissions.
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. Learn More…
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
Optional Accessories
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    Gearbox Attachments
    Gearbox attachments are available for this model. View the interchangeable gearbox chart to find out which attachments work with this model.
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    Trimmer Heads & Blades
    Many trimmer heads and blades are available. Find out which ones to use with this model in this chart.  
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    Trimmer Line
    There's high-performance STIHL trimmer line for every operating condition. 
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    Deflectors
    Protect yourself from flying debris while trimming. Check out our selection of deflectors and find the one that will help protect you.
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    Straps and Harnesses
    They distribute the load from your hands to your shoulders. They also help reduce operator fatigue and make it easier to use trimmers, brushcutters and clearing saws for extended periods.
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    •2.6 oz. bottle makes 1 gallon mix

    •5.2 oz. bottle makes 2 gallon mix

    •6.4 oz. bottle makes 2 1/2 gallon mix

    •12.8 oz. bottle makes 5 gallon mix

    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

For Your Safety
  • STIHL® Pro Mark™  Hearing Protector Zoom
    STIHL® Pro Mark™ Hearing Protector
    Padded stainless steel spring wire headband maintains constant pressure. Easy to adjust. Noise Reduction Rating (NRR): 29. Meets ANSI S3.19-1974 standard.

    Colors available: Camouflage, Orange and Grey
  • High Performance PRO Gloves Zoom
    High Performance PRO Gloves
    Elastic slip-on cuffs. Padded palm and knuckle guards. Reinforced PVC grip overlays. Sizes: M, L, XL

Are You Ready for a STIHL?

FS 91 R is rated 4.3 out of 5 by 109.
Rated 5 out of 5 by from Excellent My first Stihl Product, i use for residential every 2 week and love the power of this equipment and the build quality is Perfect, but the price in my country little high for this
Date published: 2018-07-28
Rated 5 out of 5 by from Recent Purchase Recently purchased once I returned the high end 4 cycle to Lowe’s. Really love the quality, ease of start, and power. Yes I paid a little more but I believe it will be worth it! We will truly see how it does after sitting this winter.Would highly recommend though.
Date published: 2018-07-26
Rated 2 out of 5 by from There are better options in the same price range Stihl sent me an e-mail asking my to review my purchase since my trimmer (FS 91R) is now one year old, so I decided to oblige them. Before I begin my review, I'd like to state that I have always heard that Stihl was a top brand for reliability, which is what led me to view their products when I decided to retire my old yard equipment, so I purchased a FS 91R string trimmer.The retailer where I purchased it started it up in the store for me and it ran fine. I drove home, which took about 30 minutes, and I could not get the trimmer to start. I was using the same fuel the dealer had initially started it with, so it wasn't a fuel issue. I returned it to the retailer the next day, and they could not get it to run either, so they gave me a brand new one off of the shelf, which is easy to start. The trimmer is well balanced and works okay most of the time, but there are a few issues. When starting the engine from a cold start, it starts easily by the second or third pull, but after the engine has been running for some time, and I turn it off, it is very difficult to start and requires multiple attempts. In this situation, I typically have to hold the throttle wide open while starting the engine, and even then, it takes several tries before it will run. Once it is running, it is fine. There is no choke lever on this machine. It has a rotary knob that you turn to the choke position, and as soon as you apply the slightest bit of throttle, it un-chokes. I would much prefer a manual choke lever. It is difficult to load string onto the trimmer's head, and I will soon purchase and aftermarket head for this unit to make it easier to load string. For the amount of money that this trimmer costs, I feel that there are better options that will outperform the FS 91R. I would not recommend purchasing this trimmer.
Date published: 2018-07-26
Rated 5 out of 5 by from Last one I will ever need ! I waited a few weeks to write this review , mainly because it was sooo very impressive the first day home. Now after catching up on a yard gone wild , three tanks of fuel and only one reload on the line spool (yes , the stihl line is worth it ), I am still impressed at the easy start up and power to perform, even when it is triple digit hot outside. This product line is awesome - i have had many of the other top brands - they do not compare, For any home owner and maybe some small buisines's this model is the text book version of a weed EATER ! Three years of overgrown weeds gone in seconds. I have owned two Stihl chainsaws for years - now I kick myself for not having this machine sooner.
Date published: 2018-07-20
Rated 5 out of 5 by from Great product, and always cranks right up. The Trimmer is a great product, and has a lot of power. It works great for my 4 acres and will not stop even through thick and heavy brush like weeds.
Date published: 2018-07-18
Rated 5 out of 5 by from Great Trimmer This is my 3rd trimmer and I have loved them all. The last one I had a little trouble with the idle and had it back to the shop to fix the low idle and even adjust the high idle. But other than that the trimmer is great for everything from trimming to edging.
Date published: 2018-07-16
Rated 4 out of 5 by from Love this machine. Lots of power, starts right up.The only thing I am not crazy about is the head is a little tricky to release.
Date published: 2018-07-04
Rated 1 out of 5 by from I had a 10 year old 2 stroke model , an FS 89 I think. Buying the FS 91 should have been an improvement. The 4 stroke is significantly weaker. I under I had a 10 year old 2 stroke model , an FS 89 I think. Buying the FS 91 should have been an improvement. The 4 stroke is significantly weaker. I understand that it has more chances for things to go wrong as well. I returned it and went with a different brand. Lighter, stronger, and cheaper. I love the chain saws but stay away from the trimmers !
Date published: 2018-07-01
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