FS 90


Distributor Suggested Retail Price DSRP:   $359.95

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Features a bike handle and solid drive shaft which offers end users more flexibility in mowing applications.

A great choice for environmentally conscious users, the FS 90 bike handle STIHL trimmer is engineered specifically for the landscape pro in commercial applications. Featuring our proven low-emission engine, this trimmer’s solid drive shaft offers you more flexibility in trimming applications by accepting some metal blades.

Print Spec Sheets
FS 90 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 530 cc (18.0 oz.)
CUTTING SWATH 16.5"
POWER SOURCE Gas
*Weight without cutting attachment or deflector.
Model Features
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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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    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.
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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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    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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    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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    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

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
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    HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

    •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.

  • No-Spill® Fuel Containers Zoom
    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
  • Comfort Fit Glasses Zoom
    Comfort Fit Glasses
    Comfort Fit Protective Glasses from STIHL – protection and style combined. A curved lens with side window offers a panoramic view while providing 99% UV protection. A soft nosepiece provides comfort while rubber insert temple tips reduce slippage.
  • STIHL Landscaper Series™ Gloves Zoom
    STIHL Landscaper Series™ Gloves
    Exclusive deerhide leather provides fantastic wear properties and excellent sense of touch and feel. Naturally soft leather provides all-day working comfort. Sizes available S, M, L, XL.
  • Basic Hearing Protector - NRR 23 Zoom
    Basic Hearing Protector - NRR 23
    Padded stainless steel spring wire headband maintains constant pressure. Easy to adjust. Noise Reduction Rating (NRR): 23. Meets ANSI S3.19-1974 standard.

    Available color: Grey

Are you ready for a STIHL?

Rated 4.5 out of 5 by 59reviewers.
Rated 5 out of 5 by Powerful and well built. As expected, easy start, powers through brush and large weeds. Based on three uses with blade and string head very good trimmer. September 19, 2016
Rated 4 out of 5 by Imperssive Cuts down the cat tails and 6 foot ragweed with ease September 7, 2016
Rated 5 out of 5 by Top notch brush cutter! This brush cutter/weed trimmer is so easy to use and switch from one application to the other. It has excellent power and fuel consumption. August 31, 2016
Rated 4 out of 5 by Power, easy to start and very efficient Bought this upgrade to cut a slope in my yard that is too steep to mow -down to a lake.What used to take me 90 mins with a 4cc trimmer now takes less than 30 mins.It is lightweight yet strong and powerful with the caveat that it doesn't wear me out to use the trimmer.Only negative is putting in new string is not aas simple and straight forward as I would like,The dealer showed me all the features and I got a hands on how to use the trimmer -even suggested I buy a 2nd head with string already in the head to save time and trouble - but I should have learned how to restring the empty spool August 30, 2016
Rated 1 out of 5 by Motor casing cracked and fell off I've used another one of these exact models before, and it was great. However after just 10 minutes of use the first time out with the new one, the casings around the connection to the shaft melted and cracked. The motor literally fell off the back. I took it back to the deal. They fixed in in about 3 days, but i was disspointed they did not swap this for another unit. I have much less trust in this one after just an quick failure. August 19, 2016
Rated 5 out of 5 by super trimmer This is my third trimmer. I owned and used another brand for over thirty years. I could no longer get parts for it, so I bought a new trimmer. This trimmer was stolen. I decided to replace it with a STIHL fs90. I have used it to trim my yard twice with the string head attached. The line feeds out better than either of the other two trimmers. I am also using the fs90 fitted with a 3 cutter blade to trim under the fences on my 60 acre farm. It performs this task effortlessly and uses very little fuel. In addition, it starts easily on the first or second pull and is well-balanced and doesn't tire out this 65 year-old user. After about 3 weeks use, I have found no dislikes for this trimmer. August 18, 2016
Rated 5 out of 5 by OVerall- its a workorse! The FS90 is a very good machine to get areas cleared where a large machine wont fit or cant handle the terrain. The bump head is efficient and easy to use. The head is removable and very nice that it comes with all the tools required to handle the job. It is relatively light weight and the shoulder strap helps keep it under control. Starting and stopping the motor are very simple and quick.The motor is a 2 stroke motor but purrs like a 4 stroke. It has decent power that can be easily controlled and idles like a dream. The fuel is easy to mix.I have purchased many other weed eaters that barely last a season or two. I can see the FS90 being a lifetime purchase. August 12, 2016
Rated 5 out of 5 by Pro power at a reasonable price We bought a rural lake lot that has not been touched since the 70's, completely overgrown. My FS90 with brush cutter blade has made quick work of a seemingly insurmountable task, plenty of power to mow down thickets and even 1" saplings and vines. Starts right up every time and with the standard double harness is very comfortable for long periods of use. I wish my poulan chainsaw was that dependable, guess I'll have to get a Stihl chainsaw next. July 31, 2016
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