STIHL FS 91 Petrol Brushcutter

STIHL FS 91 Petrol Brushcutter for Tough Grass and Large Areas

The STIHL FS 91 is a professional petrol brushcutter designed for regularly cutting long grass, tough weeds, nettles and rough vegetation across larger areas. Its 28.4cc STIHL 4-MIX engine produces 0.95kW / 1.3hp, while the bike handle, solid drive shaft and anti-vibration system provide the control and durability needed for demanding work.

This version is supplied with both a strimmer head for grass and lawn-edge work and a metal grass-cutting blade for tougher vegetation. It is a strong choice for professional landscapers, grounds-maintenance teams, estate owners and demanding domestic users who have outgrown a lighter grass trimmer.

Browse our complete range of STIHL strimmers and brushcutters or compare all our petrol strimmers and brushcutters.

What Masseys Think of the STIHL FS 91

At Masseys, we think the FS 91 occupies an excellent position between a heavy-duty domestic brushcutter and a substantially larger professional clearing saw. Its 4-MIX engine provides the pulling power needed for long grass, nettles and regularly maintained rough areas, while the bike handle makes repeated sweeping work easier to control. We would normally recommend the FS 70 for less frequent domestic work, the FS 94 where lower weight is the main priority, and the FS 240 for significantly denser vegetation. For regular large-area grass and weed clearing, the FS 91 is one of the most balanced choices in the STIHL range.

Key Benefits of the STIHL FS 91

• Professional 28.4cc 4-MIX engine: Produces strong low-speed torque for demanding mowing and clearing work.
• 0.95kW / 1.3hp output: Provides the power required for long grass, dense weeds and rough vegetation.
• Bike handle: Supports a controlled, natural sweeping action when working across larger areas.
• Solid drive shaft: Designed to transfer power reliably when using mowing heads and approved metal cutting attachments.
• STIHL anti-vibration system: Reduces the amount of engine vibration transmitted to the handles.
• Strimmer head and metal blade included: Allows the machine to be used for both routine grass cutting and heavier vegetation.
• Manual fuel pump and simplified controls: Help make starting and restarting more straightforward.
• Professional construction: Suitable for regular landscaping, estate maintenance and demanding garden work.

What Is the STIHL FS 91 Best For?

The FS 91 is particularly well suited to:

• Cutting large areas of long or coarse grass
• Clearing nettles, weeds and neglected vegetation
• Maintaining paddock edges, orchards and estate grounds
• Working along wider verges and fence lines
• Professional landscaping and grounds maintenance
• Heavy domestic work where a small grass trimmer is no longer powerful enough

The bike-handle design is most effective where there is space to use a broad side-to-side cutting motion. For confined areas, steep banks or frequent work around trees and obstacles, consider the STIHL FS 91 R with loop handle.

Who Should Choose a Different Model?

The FS 91 may be more machine than you need if you only trim lawn edges or maintain a small garden occasionally. In that situation, a lighter domestic petrol or cordless strimmer will normally be easier to handle.

For extremely dense scrub, heavy brambles or agricultural clearing work, a more powerful machine such as the STIHL FS 240 C-E may be more appropriate. Always use a cutting attachment, guard and harness approved for the machine and the material being cut.

STIHL FS 91 Technical Specifications

Engine	STIHL 4-MIX petrol engine
Engine capacity	28.4cc
Power output	0.95kW / 1.3hp
Weight	5.8kg excluding fuel, cutting attachment and guard
Handle type	Bike handle / cow-horn handle
Drive shaft	Solid rigid drive shaft
Anti-vibration system	Yes
Cutting attachments supplied	Strimmer head and metal grass-cutting blade
Recommended use	Large areas, tough grass, weeds and regular professional or estate maintenance

What Is Included with the STIHL FS 91?

• STIHL FS 91 petrol brushcutter
• Strimmer or mowing head
• Metal grass-cutting blade
• Appropriate cutting guard and fitting components

Please check the current product photographs and package details for the precise cutting-head, blade and harness specification supplied with this stock item.

STIHL FS 70 vs FS 91 vs FS 94 vs FS 240

Model	Best suited to	Why choose it?
STIHL FS 70 C-E	Large gardens and occasional heavier domestic cutting	A more affordable step up from an entry-level strimmer
STIHL FS 91	Regular tough-grass, weed and large-area maintenance	Strong 4-MIX torque, professional construction and head-and-blade versatility
STIHL FS 94 C-E	Professional users prioritising lower machine weight	Lightweight design with STIHL ErgoStart and ECOSPEED speed control
STIHL FS 91 R	Banks, confined areas and work around obstacles	Similar FS 91 engine performance with a more manoeuvrable loop handle
STIHL FS 240 C-E	Dense vegetation, agriculture and heavier clearing work	Substantially greater cutting performance for the most demanding jobs

Fuel, Setup and Ongoing Maintenance

Although the FS 91 uses STIHL 4-MIX engine technology, it still runs on the correctly specified petrol-and-engine-oil fuel mixture rather than having a separate engine-oil sump. Always follow the fuel and mixing instructions in the STIHL operating manual.

For convenient premixed fuel options, see our range of Aspen fuel. You can also browse our full selection of garden machinery oils and fuels.

Regular inspection of the air filter, spark plug, cutting attachment, guard and gearbox will help keep the machine working correctly. Masseys also provides garden machinery servicing and repairs from our workshop in Swadlincote.

Why Buy the STIHL FS 91 from Masseys?

• STIHL Approved Dealer
• Experienced garden machinery team
• Help choosing the correct machine and cutting attachment
• Product setup and operating advice
• Workshop servicing and long-term aftercare
• Local store in Swadlincote, Derbyshire

Choosing the correct brushcutter depends on the area, vegetation, terrain and how frequently the machine will be used. Contact Masseys if you would like advice comparing the FS 91 with another STIHL petrol or cordless brushcutter.

Frequently Asked Questions

Is the STIHL FS 91 a professional brushcutter?

Yes. The FS 91 has the engine, solid drive shaft, bike handle and anti-vibration system required for regular landscaping, grounds maintenance and demanding estate work. It can also be a suitable choice for domestic users with extensive or frequently overgrown land.

Is a strimmer head included with the FS 91?

Yes. This Masseys product listing includes a strimmer head for grass and general mowing work, together with a metal grass-cutting blade for tougher vegetation.

What is the difference between the STIHL FS 70 and FS 91?

The FS 70 is primarily suited to ambitious domestic users and less frequent heavier cutting. The FS 91 has a professional 4-MIX engine and more robust construction for repeated work in tough grass and rough vegetation.

What is the difference between the STIHL FS 91 and FS 94?

The FS 91 uses a high-torque 4-MIX engine and is particularly suited to demanding grass and weed clearing. The FS 94 is lighter and uses a 2-MIX engine with ECOSPEED control, making it attractive to professionals who prioritise lower weight during prolonged mowing work.

Can the STIHL FS 91 cut brambles?

It can tackle soft and moderately heavy vegetation when fitted with an appropriate approved cutting attachment. Thick, mature or woody brambles may require a different blade or a more powerful clearing saw. Ask Masseys for advice before fitting a non-standard metal attachment.

What fuel does the STIHL FS 91 use?

The 4-MIX engine uses the fuel mixture specified by STIHL, normally petrol combined with suitable two-stroke engine oil or an approved premixed alkylate fuel. It does not use a separate four-stroke oil sump.

Is the bike-handle FS 91 suitable around trees and obstacles?

It can be used around obstacles, but its bike handle is primarily designed for efficient sweeping work over open areas. The loop-handle FS 91 R is generally more manoeuvrable in confined spaces and on banks.

Can Masseys service the STIHL FS 91?

Yes. Masseys offers garden machinery servicing and repairs from its Swadlincote workshop, including ongoing maintenance support for STIHL petrol machinery.

Buy the STIHL FS 91 Petrol Brushcutter

Choose the STIHL FS 91 when you need a professional, bike-handle petrol brushcutter capable of regularly maintaining long grass, weeds and rough areas. Order online or contact the Masseys garden machinery team for advice before buying.