FS 90

FS 90
Features a bike handle and solid drive shaft which offers end users more flexibility in mowing applications.

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.

    More information

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

    More information

  • 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).
  • 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!
  • 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.
  • 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.
  • 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°.
  • 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.
  • Upright Translucent Fuel Tank
    Allows operator to easily check fuel level before starting work. Upright position makes it easier to refill.
  • Protected Spark Arrestor Muffler
    Has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
  • Protected Spark Plug
    Protected yet easy to change.
  • Heavy-Duty Steel-On-Steel Clutch
    Centrifugal clutch is designed to reduce slippage.
  • Protected or Enclosed Control Cables
    Eliminate dangling and loose wires.
  • Air Filter Cover
    Easily removed for fast and easy filter cleaning or replacement.
  • Throttle Trigger Interlock
    Must be depressed before the trigger can be activated.
  • Start/Run/Stop Controls on Handle
  • Protected Choke Lever/Knob
    Helps prevent damage.
  • High Tech Polymer Housing
    Housings are lightweight, withstand greater impact and are corrosion-resistant.
  • Fully Lined Drive Shaft
    Provides smooth operation and less vibration.


28.4 cc (1.73 cu. in.)
0.95 kW (1.27 bhp)
5.5 kg (12.1 lbs.)
530 cc (18.0 oz.)
*Weight without cutting attachment or deflector.

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.


FS 90 is rated 4.6 out of 5 by 63.
Rated 5 out of 5 by from Great Product for Heavy Residential Use! I have used Stihl products for various jobs over the years, but have never owned any of my own. I did not hesitate to purchase a Stihl trimmer when I needed to clean up and clear my property, that had been let go by the previous owner. With the FS-90, I had also purchased the Brush Knife Blade. I was able to quickly and effectively take out years of overgrowth. I now can maintain by whipping areas with the string. I use the machine a minimum of twice a week and have had no issues.
Date published: 2016-10-27
Rated 5 out of 5 by from Never imagined a trimmer / brush cutter could operate this well I have owned three gas powered trimmers / brush cutters over the years. Yes, the FS90 is more expensive, but you get what you pay for. This thing is a brute, plenty of power and solid, you can just feel that it is built to withstand consistent rugged use. If I had only known, I would have never wasted my money on those inferior units
Date published: 2016-10-05
Rated 4 out of 5 by from Good for mowing larger area. Too large for tight landscape spots The harness is too short for tall users. Creates a situation where you must contort your body. Power is great for clearing area with heavy weed growth. The .95 line last a long time compared to the .8 line in my previous Stihl trimmer. This saves time where I trim for 1.5 hours only 1 refill needed vs2-3 on previous unit.
Date published: 2016-09-29
Rated 5 out of 5 by from Great trimmer Excellent power, great torque. Starts right up every time. Light weight. Able to cut brush or grass.Very happy
Date published: 2016-09-26
Rated 5 out of 5 by from 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.
Date published: 2016-09-19
Rated 4 out of 5 by from Imperssive Cuts down the cat tails and 6 foot ragweed with ease
Date published: 2016-09-07
Rated 5 out of 5 by from 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.
Date published: 2016-08-31
Rated 4 out of 5 by from 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
Date published: 2016-08-30
  • y_2017, m_1, d_17, h_4
  • bvseo_bulk, prod_bvrr, vn_bulk_0.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_63
  • loc_en_US, sid_fs90, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=AGE, direction=DESCENDING)]
  • clientName_stihl

Standard Features

  • Common Features for Trimmers
    View the features common to many STIHL trimmers.

You Will Also Need

For Your Safety


STIHL Trimmers & Edgers, the Right Tools for the Job - Video
How to Wind a STIHL Trimmer Head - Video
Cutting Heads & Blades Selection Chart (PDF)
Download Instructions on How to Rewind Your Trimmer Head (PDF)
Product Instruction Manual (PDF)
Product Safety Manual (PDF)
STIHL Limited Warranty
Contact Us

My Servicing Dealer