FS 91 - $359.95 DSRP


Distributor Suggested Retail Price
FS 91

DSRP: $359.95

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A professional bike-handle trimmer with simplified starting, improved air filtration and 30% longer run time than the FS 90.

The STIHL FS 91 trimmer delivers power and comfort for landscaping professionals. Its bike-handle design is great for mowing applications – and it’s more comfortable than ever thanks to redesigned rubberized grips. The trimmer also features one touch stop and a simplified starting procedure enabled by the semi-automatic choke lever. Its low-emission engine is paired with a larger fuel tank, improv...Read More
Print Spec Sheets
FS 91 Specifications
DISPLACEMENT 28.4 cc (1.73 cu. in.)
ENGINE POWER 0.95 kW (1.27 bhp)
WEIGHT* 5.8 kg (12.8 lbs.)*
FUEL CAPACITY 710 cc (24.0 oz.)
POWER SOURCE Gas
*Without deflector and cutting attachment.
Model Features
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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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    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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    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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    Bike Handle
    When used in conjunction with a harness, the bike handle allows the machine to be easily guided, enabling a smooth horizontal mowing action to cover large areas quickly and efficiently. With soft grips for increased comfort, the bike handle provides greater control and helps reduce operator fatigue.

    See it in action!
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    Multi-Function Control Handle
    Having easy access to all of the controls on one comfortable handle makes it easy to complete tasks so the operator’s hand never has to leave the handle.
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    Tool-Free Handle Adjustment
    The central wing nut enables easy adjustment without the use of tools. For transportation and space-saving storage, the handle can be rotated 90°.
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    Cutting Heads & Blades Selection Chart
    Need help selecting a cutting head or blade for your STIHL trimmer or brushcutter?

    Click here to view the Cutting Heads & Blades Selection Chart (PDF Format).
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    Purge Pump Primer
    By pressing the bulb, this small fuel pump delivers fuel to the carburetor, reducing the number of starting pulls needed after an extended break between uses.
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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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    Start/Run/Stop Controls on Handle
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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 Plug
    Protected yet easy to change.
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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.
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    Upright Translucent Fuel Tank
    Allows operator to easily check fuel level before starting work. Upright position makes it easier to refill.
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

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    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.

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    No-Spill® Fuel Containers
    The latest advance in gasoline can technology is here with No-Spill® fuel containers. Featuring a special treated body for low permeation, thumb-button flow controls for easier pouring, and a wide and stable base design to reduce upsets, No-Spill® fuel containers help ensure that the gasoline goes into your tank, not on the ground or into the air. Fill even smaller-sized tanks without spilling – flow stops automatically when the tank becomes full. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs. Ask your local STIHL Dealer about No-Spill® fuel containers. Don’t settle for anything less.

    Meets California Air Resources Board Phase II requirements for sale or use in California. No-Spill® gasoline cans are tested and certified to ASTM F-852-99 standard specification for portable gasoline containers for consumer use and our diesel and kerosene cans are tested and certified to ASTM F-976-02 standard specification for portable kerosene and diesel containers for consumer use.

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
  • Two-Tone Work Glasses Zoom
    Two-Tone Work Glasses
    The lightweight STIHL Two-Tone Work Glasses feature a hollowed-out framework that is lightweight and comfortable to wear. Protect your eyes with ANSI standard Z87.1+ lenses, offering 99% UV protection – so you don’t have to slow down when the sun is beating down. Featuring flexible rubber temple tips and nose pads, the STIHL Two-Tone Work Glasses deliver a soft, comfortable fit for all those tough outdoor tasks that demand your full attention. Stop by our showroom to see them for yourself!
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    Outdoor PRO Gloves
    STIHL Outdoor PRO Gloves feature high-quality synthetic leather for comfort and durability. That durability is enhanced further by TPR (thermoplastic rubber) padded knuckle and finger areas. Yet the gloves remain lightweight and deliver a high degree of dexterity. The material is also breathable for all-day comfort. Feel the difference for yourself – stop by our Dealership and try them on today.

STIHL Dealer Days are Ending Soon!

FS 91 is rated 4.4 out of 5 by 31.
Rated 5 out of 5 by from Optimisim Fulfilled Bought this to replace an older trimmer and because I wanted to use a chisel saw blade. The trimmer runs great, is powerful, easy to use, and handles well. I needed to adjust the strap mounting location (was not well balanced in the factory delivered location). The chisel saw is an awesome tool. Makes clearing small trees effortless. Stihl is everywhere, so service and parts are everywhere too if needed. I now own 2 Stihl chainsaws and a trimmer. Best tools I own.
Date published: 2018-05-16
Rated 4 out of 5 by from Trimmer has great features. It's nice to have a reliable trimmer and starts easy. The thing that sold me is the adjustable carburator that some manufacturers don't have, if neede down the road.
Date published: 2018-05-11
Rated 1 out of 5 by from run poorly i bought one of these after doing a lot of research on different trimmers and it sounded perfect for my weekly yard work but after taking it home it would not get up to higher end of power and the high end jet was starving it of fuel . so i packed it up and took it right back to my dealer they said the person that is trained on theses would not be there till the next day, they looked at it and gave it back to me tried again and the same problem infarct the weeds slowed it down and killed it, took it back for my money back . now with that said i do have other stilhl products with no problems so im not given up on them, but this one sucks.
Date published: 2018-05-08
Rated 4 out of 5 by from Cutter extraordinaire Wonderful, powerful. Only problem engine missing, cutting back at higher end. Won’t reach full rpm.
Date published: 2018-04-17
Rated 5 out of 5 by from An awesome machine What a sweet step up from my old and still reliable stihl trimmer. The FS91 is easy starting with great balance and awesome power. I also bought the head with three blades because I had it on my older one and it is a great cutting accessory. I bought the full harness but haven't used it yet. Payne Power Equipment has always been my trusted dealer. Always ready and very knowledgeable about each item. Thanks Guys
Date published: 2018-03-25
Rated 5 out of 5 by from Everything I expected! I have a few FS100RXs one that is a 2007 model that still runs as good as new but, I wanted to take some weight of my arms and back and thought I would give the handle bar a try. The FS91 is worth the extra money. I sprung for the full harness and have not been disappointed. I just fired them up after only letting them run for about 10 minutes each month since I put them away at the end of November 2017 and they run just as good now...no slow idle or hard starts. I bought 1 in the summer of 2016 and another one in spring of 2017 and all I've done in terms of maintenance is change the air filters but, they were not running poorly when I did that...just looked pretty dirty. No complaints.
Date published: 2018-03-15
Rated 5 out of 5 by from One serious weedwacker This is my first Stihl product and I'm very impressed. The smooth 4-cycle engine cuts through brush like butter. The first task I needed to do was to attach the cutting blade and cut down a bunch of oak brush saplings on our 5 acre property. This model was perfect for the job. Looking forward to years of reliable use from this product.
Date published: 2017-11-29
Rated 2 out of 5 by from Not enough torque/poor throttle response. I spent 13 hours with this machine and finally returned it to my dealer. (He was extremely polite when honoring my request.) I upgraded to the fs131 at almost the exact same weight. It's absolutely worth the extra money, and it comes with the harness.
Date published: 2017-11-18
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