FS 91 R - $329.95 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $329.95

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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.)
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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    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 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: Cancer and Reproductive Harm - www.p65warnings.ca.gov
ADVERTENCIA: Cáncer y Daño Reproductivo - www.p65warnings.ca.gov
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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    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
  • 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
  • Patterned Frame Glasses Zoom
    Patterned Frame Glasses
    Experience professional-grade protection from the harsh sun with the Patterned Frame Glasses from STIHL. Offering 99% UV protection, the glasses meet ANSI standard Z87.1+ and feature comfort-cushioned nose pads and polycarbonate impact-resistant lenses. They’re also lightweight and slip-resistant. Stop by our showroom to check out the Patterned Frame Glasses, as well as all of our protective eyewear!
  • 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 103.
Rated 5 out of 5 by from Best peace of equipment I own Fires right up first or second pull, got about 7 hrs on it so far and just used up the first tank of gas, it's insane how long the tank goes, would have been about 2-3 tanks on my old craftsman one. Haven't had any issues with the bump head that weren't my own fault. I'm sold. Never going to go back to the cheapo line trimmers again!
Date published: 2018-04-28
Rated 5 out of 5 by from I am so glad I bought this trimmer. I only use this product for homeowner use but after years of hassling with mid-grade trimmers I finally stepped up and bought what I really wanted, a stihl product. It starts and runs perfectly and has way more power than I need. My only complaint is the trimmer head. I've had the string break inside the head twice now. It's not a big deal for me because I'm not trimming to make a living and the problem is fixed quit easily. This being said, I am going to try using some higher quality string when it's time to refill and if that doesn't work I will change the head to an aftermarket brand. I would buy this product again in a heartbeat.
Date published: 2018-04-25
Rated 5 out of 5 by from a suprisingly powerful machine i just bought mine last saturday a week ago on their special deal that they have goin on it i bought it thinkin it was gonna be a real wimp machine but once i started it up and ran it awhile cuttin what was able to be cut so far it really suprised me it's got plenty of power for doin most things although things havent grown much yet around here it did power through anything i took it to and i have no doubt in my mind that it would cut down hay sized stuff once the grass gets high enough although it isnt as powerful as an fs130R or either one of the 131's all 3 of which i also have it seems to do a pretty good job but there is one small gripe although a small one an annoying gripe all the same and that is that when ya go to change the string on mine one of the eyelets fell out i know it doesnt happen with all machines but some of these heads stihl makes or outsources to these heads arent quite the quality they used to be after they made their cosmetic changes on alot of these machines the eyelets in the heads will fall out so make sure ya dont lose em if and when they fall out but anyways do i recommend this machine ? yeah i do i highly recommend it it has more than enough power for most people so dont wait people get to your local dealer and buy one
Date published: 2018-04-08
Rated 5 out of 5 by from Packed with great features! FS 91 R has the features and power I need to get my work completed. Easy operation with the maneuverability to work around all the obstacles I encounter. Love the easy operation, power and durability that Still has always provided me. Looking forward to the many years of service that it will provide just like the last one I owned.
Date published: 2018-04-07
Rated 3 out of 5 by from Poor trimming head Trimming head is not good for commercial use - cheaply made and does not work well
Date published: 2018-04-04
Rated 5 out of 5 by from Top of the heap I've never had a problem with this trimmer. It starts quick every time. It has more power than I thought possible for a small engine. I'm a home owner with an average yard and I'm sure this is the last trimmer I will ever need.
Date published: 2018-04-03
Rated 3 out of 5 by from Cheap Trimmer Head Design I have the Stihl FS-90R, since purchasing this machine I have had nothing but problems with the head spool either it won't release new string or it snaps off causing me to remove the head cover, it takes me longer to do my yard with this machine than it does with my than it does with my old sears electric model, they seriously need to go back to the drawing board on this one.
Date published: 2018-04-03
Rated 4 out of 5 by from Poor Quality trimmer head; great engine I have owned other trimmers. My Stihl has twice the power and is extremely easy to start. I love it. Unfortunately, the head that came with my FS 91 R is significantly inferior to my older Speed – Feed High Capacity head which reloaded without disassembling. More Importantly, the head does not jam like the Stihl. I tried different tensions on the line when reloading but still the same problem – jamming which causes me to disassemble the head.
Date published: 2018-03-20
Rated 4 out of 5 by from Pretty good for a lawn care business I would recommend buying this weedeater. There is tons of power, little vibration and an auto choke which makes it easy to use. Although there is a lot of power you barely have to push the trigger for full power which makes it easier but then it really wastes the trigger. I've pushed the trigger all the way down and the engine cuts up so it's really not good for the engine. Other than that it is pretty light and pretty reliable. Tip: when you first get it do not use it at full power break it in.
Date published: 2018-03-19
Rated 3 out of 5 by from Ditch the 91r and start making the FS 90r again. The old saying "if it aint broke don't fix it" applies here. The changes made from the 90 to 91r, are not significant enough to make any difference in usability. They use the same amount of gas and are not any lighter in weight. I run a mid size landscaping company and use mostly Stihl power tools. Last year we purchased 4 new trimmers which turned out to be the FS 91r. I will never buy a new model first year out again. Stihl knows the issues, as I'm sure they've been filling a lot of warranty requests for the new model. All four trimmers I bought last April 2017 had to be taken in for warranty work within months of purchase. Mainly due to the shaft coming warn at the clutch and failing to spin the head. My other gripes are that the small changes to some parts in the engine are cheaper and not as durable. Now they're hard to find because most suppliers have not switched over to the new model. Lastly, now I have four 90's and four 91's so I have to order different parts for essentially the same machine. This year I'll probably look into older models used on EBay to add to my fleet.
Date published: 2018-03-07
Rated 5 out of 5 by from AWESOME! I have two of these in my lawn care setup and they are the best trimmers on the market!
Date published: 2017-12-08
Rated 2 out of 5 by from FS 91 I purchased this product from Ace hardware. My other trimmer was stolen. I wanted the previous model just like the one I purchased 6 months prior. I was given the FS 91 model because the 90 was no longer available. Big mistake buying the FS 91. It’s a pain trying to turn it on. I still don’t fully understand how to turn it on. The 90 model was so simple to turn and easy to maneuver. The price was also overrated. The FS 91 quality is like a residential home owner product. It should not be categorized as a pro product. I wish I can get my money back...
Date published: 2017-11-29
Rated 5 out of 5 by from best value-for-money trimmer on the market starts very quickly, third pull for me. surprisingly light, considering its size. very powerful. love the rubber grips, too. It is a very comfortable trimmer, great for prolonged use. Also, I can cut around 15 yards on one tank of gas. my only complaints are the lack of a detachable shaft, and it can be difficult to disassemble the head to restring it. I have to use a flathead screwdriver. I have used many trimmers, this is the best one. very good trimmer for the money.
Date published: 2017-11-07
Rated 5 out of 5 by from Perfect size I bought this trimmer to clear out shooting lanes. I bought the 3 blade cutter for clearing saplings and briars. The trimmer has plenty of power and not real heavy. Super fuel efficient.
Date published: 2017-11-01
Rated 5 out of 5 by from This product is dependable and powerful This trimmer started right up after the cold winter months. Ran all spring and summer with no issues. LOVE all Stihl products!!
Date published: 2017-10-28
Rated 5 out of 5 by from FS 91R works well So far it has done all it is advertised to do. Starts pretty quickly, runs like a Stihl should, and is hassle free.
Date published: 2017-10-25
Rated 2 out of 5 by from Low on power and high on gas consumption This is my first Stihl product and I was excited to buy it. I purchased a Stihl FS91R a week and a half ago. I used it once. I did a lot of research and was going to get this or the Komi 91. After talking to the dealer I went with this and ordered the edging head to swap too.It starts up great and idles very nice. After that it loses it's glamour. When trimming it doesn't take much to slow it down, and anything thicker than a blade of grass it is unable to cut, Instead the line wraps around the weed stalk, or I have to take smaller bites through the grass. When at full throttle it sounds like the engine is starving and doesn't have a nice consistent engine purr. I also noticed that when going from idle to rev it to cut I can hear a metal clunk like the clutch is engaging. This should be audible. I only ran one full tank of gas in this, and was only able to trim my yard and my neighbor's when it ran out of gas. I am disappointed because I expected so much more from the Stihl product. I finally retired my old MAC trimmer after 23 years. it had much more power and ran great. It effortlessly mowed down grass, weeks, and small trees with little effort and only a weed trimmer line (no special brushcutter head). With my old machine I was also able to trim for about a month or more before having to refuel. Maybe I should just return the Stihl and buy a new ZAMA carburetor for my MAC and put it back to work. For a brand new machine this Stihl should not have to go back for work right from the start. This is not a satisfactory machine. I expected more especially since I went a step up from homeowner to the professional grade. Would I ever be losing business if owned a landscaping company and had to rely on this? Yes I would.
Date published: 2017-10-20
Rated 5 out of 5 by from Swappable Head Units? YES PLEASE! I went to a Popps store in a neighboring city that came highly recommended. I went in the first time to just ask some questions about the Kombi system. He said that they don’t normally carry the Kombi in store cause you can change the head stock on a normal trimmer unit for whatever your needs may be. Blew my mind. Went in a second time to buy the unit. Ended up going with the 91R, the edger unit, 6pk of oil (cause they double your warranty from 2 to 4. No brainer their!) and a new gas tank. Starting fresh! I just recently started taking care of my churches property which is actually 4 in one. And this unit has come in very handy and VERY easy to start. Will be going back soon for the chainsaw attachment!
Date published: 2017-10-18
Rated 5 out of 5 by from Great product! I finally went from box store brand trimmers because they were so under-powered and I was having to replace them all the time for various quality issues. I can do more at quarter throttle with this trimmer than I could at full throttle with the old ones. It's a little heavy, but the power is well worth the extra weight.The trimmer line could be more durable, but switching to the heavier stuff will void warrantee.
Date published: 2017-10-03
Rated 5 out of 5 by from Excellent trimmer, loads of power, low fuel consumption I bought this trimmer one year ago today, and used it to clean up 8 acres of land that had been left vacant for years. I bought the brush cutting blade with it, and it has plenty of power to cut down large saplings without bogging down. Excellent all around trimmer/brush cutter, uses very little fuel. This thing ran nearly non stop for weeks on end, and still is used frequently. Has never failed to start, with no more than two pulls.
Date published: 2017-09-26
Rated 2 out of 5 by from Loss of power I have trusted stihl products and loved them,except this trimmer!!!! Had the same problem of loss of power ,its been in shop four times and they all say varb was gunked up.Then they go on to say it runs great!! Well why after a hour of being out of shop it will not stay at full throttle??? The products are expensive enough i cant afford to have worked on every year!
Date published: 2017-09-20
Rated 4 out of 5 by from Strong and ready for use A little pricey for most consumers, but overall it has the power to tackle most of what I needed it for. Engine gets a little warm up around the top end (Wish they worked a heat deflector into design) when using as I am a tall person. The push to extend line button did not last long before I had to replace it, fuel filter popped out, and gas cap retention line was poorly designed. The motor is strong and reliable: as well as; quick to start and power through "Most" of my yard with ease.
Date published: 2017-09-20
Rated 4 out of 5 by from Should have bought the higher hp model Overall good performing but did bog down a little in heavy grass/brush. I am going to invest in the blades to see if that improves performance. I almost bought the higher hp model just to be sure but did not want to go way over budget.
Date published: 2017-09-19
Rated 5 out of 5 by from This product is as advertised. This product has a lot of power, but more important is that it starts every time. I have no idea why I waited so long to buy this trimmer.
Date published: 2017-09-08
Rated 2 out of 5 by from Won't stay at high throttle I love stihl so don't think I'm writing this to down on stihl. It's just I have recently bought the brand new fs91r and since day one the weed eater would not stay at high throttle when string extended. And I took it in for repair 3 times before someone found the filter was dark brown. Said it was from ethonal in gas and that I got the bottom of the tank. He said to only use 93 or ethonal free gas. Well seeing as ethonal is not at every gas station I have done 93 and now it's doing it again where it don't want to run when string is out. But the past three weeks after it has ran awesome. But now having same issue as before. Still not as good as my old fs90r I had though.
Date published: 2017-09-07
Rated 5 out of 5 by from Product has great power. Trigger to small i like new choke system the weight of product makes it easy to use. Stihl has made sure our dealer is well trained on products.
Date published: 2017-08-26
Rated 4 out of 5 by from Very good product. This trimmer is the best you purchase for your money. It is professional grade, so if you buy it for your personal yard use it is the last one you will ever have to buy. It zips right on through tall grass and weeds with ease. I bought it because I got tired of the home depot grade and i wanted something that will last for long time and I have no doubt that it will. It starts up with no problems and once it warms up its ready to get the job done. I am very pleased with this investment and the price wasn't to high. I recommend this particular weed trimmer if you need something for your home use and you want it to last,
Date published: 2017-08-23
Rated 4 out of 5 by from Ready for a good day's work. After wearing out an older string trimmer with handlebars, which I liked, my Stihl dealer sold me on a 91-R, which I have used in getting ready for this summer's fire season. The extra volume in the fuel tank has made my work in trail clearing and a clear zone around the house a lot more efficient. I can get through a whole day with just a couple of pauses to re-fuel.It took me a little-head-scratching to figure out a tiny little change in the way the head opened up to replace the trimmer line, and I needed to whack the ground a little harder to make the bump-feed work, but in the end, it was only a bit different from the one I was used to.Overall, a good piece of equipment.
Date published: 2017-08-22
Rated 5 out of 5 by from Good trimmer starts easy has good power. I like the strap to allow good weight distribution and power is good. Starting is great.
Date published: 2017-08-21
Rated 5 out of 5 by from Awesome machine This by far is the best trimmer i have ever owned. I trim over 300yds if ditches and around 2 acres. No bogging down and no mercy. Perfectly balanced. I love it!
Date published: 2017-08-20
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