FS 100 RX
A professional grass trimmer that delivers big power in a lightweight package.
Trim circles around other professional trimmers with the lightweight STIHL FS 100 RX trimmer. It is 8% lighter and delivers over a 10% increase in power than the FS 90 R to help get the job done quicker and reduce operator fatigue. With its high-powered and low exhaust emission engine, this straight-shaft trimmer delivers one of the best power-to-weight ratios in its class. It features a loop handle for excellent maneuverability around landscaping obstacles and its anti-vibration system provides enhanced user comfort. This grass and weed trimmer is the perfect choice for trimming professionals who demand a lightweight trimmer with plenty of power.
Professionals demand more from their grass trimmers – more power, more comfort and more dependability. That’s why STIHL professional trimmers are in such high demand – they deliver on performance. With more power, greater comfort features and durability, STIHL professional trimmers are made for daily use. Here are some of the features you’ll find on every STIHL professional grass trimmer:
- Multi-Function Control Handle delivers easy access to ON/OFF and throttle controls on one comfortable handle. This makes it easy to use without the operator’s hand ever leaving the handle. Some models feature a momentary stop switch, ensuring the switch is “ON” the next time you start – helping to prevent engine flooding.
- Adjustable Front Handle can be positioned for optimal comfort.
- Adjustable Harness adds comfort and stability during use.
- Easy-Access Air Filter allows for easy filter cleaning or replacement.
- Easy-Access Starter Assembly for infield repairs.
- Heavy-Duty Steel-on-Steel Clutch helps reduce slippage and provides durable, long-lasting wear.
- Easy-View Deflector provides easy-to-see cutting and is also designed to protect user against flying debris.
- Long-Life Engine Cylinders provide optimal cooling, lubrication and more power output per cubic centimeter of engine displacement for maximum wear life.
- Electronic Ignition provides easier starting and smoother running.
- Ergonomic Design reduces fatigue and enables comfortable operation.
- Smooth Edges will not snag on clothing or brush.
- High-Tech Polymer Housings are lightweight, withstand greater impact and are corrosion resistant.
- 2-Ring Pistons improve engine efficiency and hold compression longer than 1-ring pistons. Also they transfer heat from the piston to cylinder better, helping engine stay cooler and last longer.
- Enclosed Throttle Cables eliminate dangling and loose wires.
- Protected Choke Lever/Knob helps prevent damage.
- Protected Spark Plug is protected yet easy to change.
- Protected Throttle Trigger helps prevent damage.
- Purge Pump Primer enables the user to prime the carburetor with fuel, providing easier starts.
- Spark Arrester Muffler has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
- Throttle Trigger Interlock helps prevent accidental acceleration.
- Fully Lined Drive Shaft provides smooth operation and less vibration.
- Upright Fuel Tank with Retainer Cap for easy fueling.
You’ll find these powerful, professional STIHL trimmers only at servicing STIHL Dealers. See your Dealer to learn more about these quality tools and demo them before you buy. STIHL is a great investment for your landscaping business, delivering quality and improved long-term productivity.
STIHL is the #1 selling brand of gasoline-powered handheld outdoor power equipment in America and the Number One selling brand of chain saws in the world*. Sold and serviced through our network of independent Dealers, STIHL power tools deliver versatility and dependability. STIHL tools are German engineered, and many are built right here in America and exported to over 90 countries around the world.* To find one of the over 8,000 STIHL Dealers near you, visit the Dealer Locator.
*A majority of STIHL products are built in the United States from domestic and foreign parts and components. "Number one selling brand" is based on syndicated Irwin Broh Research as well as independent consumer research of 2009-2011 U.S. sales and market share data for the gasoline-powered handheld outdoor power equipment category combined sales to consumers and commercial landscapers.
| FS 100 RX Specifications | |
| DISPLACEMENT | 31.4 cc (1.9 cu. in.) |
| ENGINE POWER | 1.05 kW (1.4 bhp) |
| WEIGHT* | 4.9 kg (10.8 lbs.) |
| FUEL CAPACITY | 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.
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. -
Loop Handle (R)
Loop handle grass trimmers and brushcutters are ideal for trimming between bushes and shrubs and other areas where space is limited. -
Electronic Ignition Module
The electronic ignition provides reliable starting and because it is fully enclosed, it is protected from moisture and debris for longer service life. -
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. -
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. -
Anti-Vibration System
STIHL has a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
Standard Features
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Common Features for Trimmers
View the features common to many STIHL trimmers.
You Will Also Need
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HP Ultra 2-Cycle Engine Oil
No matter how you slice it (or trim it or shred it), there’s no better protection for your high performance 2-stroke engine than STIHL HP Ultra. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus “ultra” lubricating qualities that’s superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We’re so confident this oil will protect your engine, we’ll double your STIHL limited warranty* when you use it. It’s that good.
*Double your warranty when you include 6 bottles of STIHL HP Ultra Oil or 6 cans of STIHL MotoMix® Premixed Fuel with your STIHL product purchase. Double limited warranty protection applies to STIHL gasoline-powered products purchased and registered for personal non-income producing, family and household purposes only. Other restrictions apply. See dealer for details.
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No-Spill® Fuel Containers
No-Spill® fuel containers advance convenience and quality in gasoline-can design by reducing emissions of hydrocarbons from evaporation, permeation and spillage. This helps protect the environment as well as saves you on fuel costs due to waste. Each container is molded from fluorinated, high molecular weight material for low permeation. The thumb-button flow control allows filling even smaller-sized tanks reducing the risk of spilling and is designed to stop the flow automatically when the tank becomes full to prevent overflowing. Built on a wide and stable base for less likelihood of upsets and equipped with child-resistant closures, all No-Spill® containers comply with both EPA and CARB requirements. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs.
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For Your Safety
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Landscaper Series Gloves
For landscapers who work extensively with their hands, the Landscaper Series Gloves from STIHL are made from strong-yet-supple deerhide leather. They provide fantastic wear properties and an excellent sense of touch and feel. The naturally soft leather provides all-day working comfort.
Materials: Deerhide leather
Available sizes: S, M, L, XL
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HP 23 Hearing Protector
When it has the STIHL name, it’s made to work as hard as you do. Our Hearing Protectors feature a padded stainless steel spring wire headband. They help maintain constant pressure, staying firmly in place while you work. They’re also easy to adjust, so you can set the ideal fit with minimal effort.
Meets ANSI S3.19-1974 standard. Noise Reduction Rating (NRR) of 23 dB(A).
Available color: Grey
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How to Wind a STIHL Trimmer Head - Video
How to Start a STIHL Trimmer - 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
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