STIHL FS 91 R Petrol Brushcutter

Why Masseys recommends the STIHL FS 91 R

Masseys recommends the STIHL FS 91 R petrol brushcutter to customers who have outgrown a lightweight domestic strimmer but still want the manoeuvrability of a loop-handle machine. It is particularly well suited to cutting around trees, fence lines, borders, banks, posts and other obstacles where a wider bike-handle brushcutter can feel restrictive.

The 28.4cc STIHL 4-MIX engine provides the torque needed for long grass and dense weeds, while the rigid drive shaft, anti-vibration system and large fuel tank make the machine suitable for regular grounds-maintenance work. For occasional lawn edging, a lighter machine such as the STIHL FS 94 RC-E may be easier to handle. For prolonged cutting across large open areas, a bike-handle model such as the STIHL FS 70 C-E may provide a more natural sweeping action.

STIHL FS 91 R at a glance

• 28.4cc STIHL 4-MIX engine producing 0.95kW / 1.3bhp
• Loop handle for accurate cutting in confined areas and around obstacles
• Rigid drive shaft for dependable transfer of power to the cutting head
• STIHL anti-vibration system to reduce vibration at the handles
• 0.71-litre fuel tank for longer working periods between refills
• 5.5kg dry weight without cutting attachment or deflector
• Supplied with an AutoCut C 26-2 mowing head and single shoulder harness

What is the STIHL FS 91 R best for?

The STIHL FS 91 R is best suited to regular cutting of long grass, dense weeds and difficult growth in areas where precise control is important. Its loop handle makes it particularly useful when working along edges or navigating around obstacles.

• Long and overgrown grass
• Dense weeds and nettles
• Fence lines, trees, posts and borders
• Banks, slopes and awkward ground
• Estate, paddock and property maintenance
• Professional landscaping and grounds-care work

Customers maintaining only small areas of short lawn may find a lighter cordless or petrol strimmer more appropriate. Explore the full range of strimmers and brushcutters or view all STIHL strimmers and brushcutters available from Masseys.

Key features and benefits

28.4cc STIHL 4-MIX engine

The STIHL 4-MIX engine combines strong pulling power with a compact design. The FS 91 R delivers 0.95kW of output, giving it the performance required for demanding grass and weed-cutting jobs.

Although the engine operates using four-stroke principles, it is lubricated by a petrol and two-stroke oil mixture. Always use the correct fuel mixture or an appropriate ready-mixed fuel in accordance with the STIHL operating instructions.

Loop handle for confined and awkward areas

The loop handle gives the operator close control of the cutting head and makes the machine easier to position around trees, walls, beds and other obstacles. It is also useful when working on banks or in spaces where a wide bike handle would restrict movement.

Rigid drive shaft

A rigid shaft transfers power effectively from the engine to the cutting attachment. This makes the FS 91 R a more robust choice for regular demanding work than a lightweight curved-shaft grass trimmer.

STIHL anti-vibration system

The anti-vibration system reduces the level of engine vibration transmitted to the handles. This improves comfort and control during longer cutting sessions, although suitable breaks and personal protective equipment should still be used.

Simplified starting and stop-button control

The control system is designed to make starting and restarting straightforward. After the machine is switched off, the stop control returns to its operating position so the brushcutter is ready for its next start.

Large 0.71-litre fuel tank

The larger fuel tank reduces the frequency of refuelling during extended grounds-maintenance jobs.

Technical specifications

Manufacturer specifications may be updated. Weight is stated without the cutting attachment and deflector.

What is included with the STIHL FS 91 R?

• STIHL FS 91 R petrol brushcutter
• STIHL AutoCut C 26-2 mowing head
• Single shoulder harness
• Appropriate standard guard for the supplied mowing head
• Operating instructions

The AutoCut C 26-2 is a semi-automatic mowing head. The mowing line is advanced by tapping the head lightly against the ground while it is rotating.

Which STIHL petrol brushcutter should you choose?

Choose the STIHL FS 91 R when:

• You regularly cut long grass and dense weeds
• You need a manoeuvrable loop handle
• You work around trees, fences, beds or other obstacles
• You want a professional-grade rigid-shaft machine
• You require more torque than a lightweight maintenance strimmer

Consider the STIHL FS 94 RC-E when:

The STIHL FS 94 RC-E is a lighter loop-handle brushcutter designed for landscape-maintenance work. It may be the better choice where reduced machine weight, precise edging and regular lighter vegetation cutting are the main priorities.

Consider the STIHL FS 70 C-E when:

The STIHL FS 70 C-E has a bike handle that supports a wider side-to-side cutting action. It may be preferable for sustained mowing across larger, more open areas.

Fuel, mowing line and compatible accessories

The FS 91 R uses a petrol and two-stroke oil mixture despite operating with a 4-MIX engine cycle. Follow the fuel-mixing instructions in the STIHL manual and use fresh, high-quality fuel.

Masseys stocks suitable oil and fuel products, including Aspen alkylate fuel for customers looking for a clean-burning, stable ready-mixed fuel option.

The supplied AutoCut C 26-2 mowing head can use approved 2.4mm or 2.7mm mowing line. Always check the head, guard and line combination before use.

Important: do not fit a metal cutting blade solely because it physically connects to the machine. Any metal attachment must be approved for the FS 91 R and used with the complete guard, barrier bar, harness and fastening configuration specified by STIHL. Ask the Masseys garden-machinery team to confirm compatibility before purchasing or fitting a different cutting attachment.

Servicing and aftercare

Regular servicing helps maintain starting performance, engine reliability and safe operation. Air filters, spark plugs, fuel components, guards, cutting heads and the drive system should be inspected at the intervals stated in the operating instructions.

Masseys provides local garden-machinery servicing and repair support. The team can also advise on suitable mowing line, fuel, protective equipment and replacement cutting heads for your intended work.

Frequently asked questions

Is the STIHL FS 91 R suitable for professional use?

Yes. The FS 91 R is designed for regular demanding grass and weed cutting, including landscape, estate and grounds-maintenance work. Its rigid drive shaft, anti-vibration system and 4-MIX engine distinguish it from lighter domestic grass trimmers.

Is the STIHL FS 91 R a four-stroke brushcutter?

It uses STIHL 4-MIX engine technology and operates using four-stroke principles, but it does not have a separate engine-oil sump. It is lubricated by a petrol and two-stroke oil mixture in accordance with STIHL’s instructions.

How much does the STIHL FS 91 R weigh?

The stated dry weight is 5.5kg without the cutting attachment and deflector. The operating weight will be higher once fuel, the guard, cutting head and mowing line are fitted.

What mowing head is supplied?

The machine is supplied with a STIHL AutoCut C 26-2 semi-automatic mowing head.

What size mowing line does the AutoCut C 26-2 use?

The AutoCut C 26-2 is compatible with approved 2.4mm and 2.7mm mowing line. Select the line profile and diameter according to the vegetation being cut and STIHL’s instructions.

Can a metal blade be fitted to the FS 91 R?

Only use cutting attachments and complete fitting configurations approved by STIHL for this exact loop-handle model. Metal-blade setups may require a specific guard, barrier bar, harness and fastening hardware. Compatibility should be confirmed before fitting.

Is a loop handle or bike handle better?

A loop handle offers greater manoeuvrability around obstacles, on slopes and in confined spaces. A bike handle generally provides a more comfortable sweeping action when cutting broad, open areas for extended periods.

Is a harness included?

Yes. The STIHL FS 91 R is supplied with a single shoulder harness.