STIHL FS 91 Petrol Brushcutter

Perfect for tackling overgrown grass, thick weeds, and general landscape maintenance, the STIHL FS 91 is a robust petrol brushcutter designed for both professional and large-scale domestic use. Combining powerful performance with ergonomic design and premium features, it’s built for efficiency and comfort.

Overview of the STIHL FS 91 Petrol Brushcutter

Designed to manage extensive areas with ease, the STIHL FS 91 Petrol Brushcutter is equipped with a sturdy drive shaft and a compact yet high-performing STIHL 4-MIX® engine. This advanced engine technology provides greater fuel efficiency, lower emissions, and high torque while remaining fully compliant with the European Union’s Stage V emissions regulations.

Weighing 5.8 kg (excluding fuel and cutting attachment), this petrol brushcutter features a displacement of 28.4 cm³ and a maximum power output of 0.95 kW (1.3 hp). Its generously sized fuel tank extends working time between refuels. The sound power level is 104 dB(A), while the operator’s sound pressure level is 94 dB(A), making it a practical choice for outdoor tasks.

(Note: The STIHL FS 91 requires a fuel mixture ratio of 50 parts unleaded petrol to one part oil.)

Cutting Equipment & Performance

Supplied with a durable metal grass blade and an AutoCut mowing head, the FS 91 ensures efficient cutting across a 420 mm diameter. Whether trimming dense grass or handling tougher vegetation, this versatile brushcutter is up to the task.

Effortless Fuel Priming & Easy Start

A manual fuel pump is integrated into the FS 91’s design to reduce the number of pulls required to start the engine—particularly useful after long periods of non-use. Simply press the pump multiple times to fill the carburettor and enable quicker ignition.

Quick Restart Function

The FS 91 features a simplified starting system, with an easy-to-access stop button on the handle. When the tool is switched off, the button automatically resets, allowing for a seamless restart without additional adjustments.

Durable & Accessible Air Filter

Built for longevity, the FS 91 Petrol Brushcutter is fitted with a long-lasting air filter that ensures consistent engine performance. When maintenance is required, the filter is simple to access and replace.

Ergonomic Handling for Maximum Comfort

The FS 91 is designed with a multi-function handle that centralises control for ease of use. This handle can be operated with either the left or right hand, catering to all users.

Its bike-style handlebar design enhances manoeuvrability, and with a central clamping device, users can easily adjust the handle to their preferred position without tools. For compact storage and transportation, the handlebar can be rotated by 90 degrees.

Harness Support for Reduced Fatigue

For enhanced comfort, the FS 91 Petrol Brushcutter is designed to be used with an Advance universal double shoulder harness (included in the price). The harness, in combination with the bike handlebar, ensures a smooth and controlled cutting motion, reducing operator fatigue—especially on extensive jobs.

Vibration Reduction System

STIHL’s advanced anti-vibration system helps minimise discomfort during extended use. A combination of buffers and springs dampens engine vibrations before they reach the handle, allowing for smoother operation and increased user comfort.

Optional Accessories

A variety of compatible accessories are available for the FS 91, including the STIHL Smart Connector, RG Rotary Cutting Head, FH 145-degree Scrub Cutter Attachment, and Advance X-Vent Helmet, allowing you to tailor the tool to specific needs.

STIHL Warranty for Peace of Mind

STIHL is renowned for producing high-quality, long-lasting power tools.

For added assurance, the FS 91 Petrol Brushcutter is covered by a 2-year domestic warranty or a 1-year commercial warranty, offering durability and reliability in every use.

Frequently Asked Questions

Q) Does the STIHL FS 91 have a 4-stroke engine?
A) The FS 91 features STIHL’s innovative 4-MIX® engine, combining the benefits of both two-stroke and four-stroke engines for optimal performance.

Q) What is the engine displacement of the FS 91?
A) The STIHL FS 91 has a displacement of 28.4 cc, providing a balance of power and efficiency.

Q) What fuel mix does the FS 91 require?
A) The STIHL FS 91 operates with a 50:1 fuel mix—50 parts unleaded petrol to one part oil.