STIHL FS 91 Brushcutter

Why buy the STIHL FS 91 17″ Brushcutter? Powerful and high-torque STIHL 4-MIX® engine for demanding tasks. Perfect for landscape maintenance and clearing large areas of tough grass. Includes ADVANCE universal harness for enhanced comfort and reduced fatigue. Supplied with both an AutoCut C 26-2 mowing head and a GrassCut 230-2 metal blade. Ergonomic bike handle and anti-vibration system for comfortable, prolonged use. Simplified starting procedure and intuitive single-handed controls. Tackle Overgrown Areas with Confidence The STIHL FS 91 is a powerful and reliable petrol brushcutter engineered for working on large areas of tough, stubborn grass. It’s the ideal choice for landscape maintenance professionals and property owners who need a machine that won’t back down from a challenge. Featuring a simplified starting sequence and a rigid drive shaft, the FS 91 is built for performance and durability. Powerful & Efficient STIHL 4-MIX® Engine At the heart of the FS 91 is the innovative STIHL 4-MIX® engine. This technology combines the benefits of two-stroke and four-stroke engines, running on a standard fuel-oil mix. This eliminates the need for separate oil changes, making it lighter, more compact, and requiring less maintenance than conventional four-stroke engines. It delivers fantastic torque and power with a more comfortable sound profile, all while complying with European Stage V emissions directives. A larger fuel tank ensures increased cutting time between refills, maximising your productivity. User-Focused Ergonomics and Control STIHL has designed the FS 91 with operator comfort as a priority. The ergonomic bike handle allows for a natural, smooth mowing motion, making it effortless to cover large areas. This handle can be easily adjusted without tools via a central clamping device and can even be rotated 90 degrees for compact storage and transport. All essential controls are integrated into a single-handed multi-function handle for easy and reliable operation. Furthermore, the STIHL anti-vibration system uses buffer and spring elements to reduce the vibrations transmitted to the handle, significantly reducing operator fatigue during long working days. Versatility Straight from the Box The FS 91 comes ready to work, supplied with a comfortable ADVANCE universal harness to distribute the machine’s weight evenly. For cutting flexibility, it includes both the AutoCut C 26-2 mowing head for clearing grass and an aggressive GrassCut 230-2 metal blade for tougher vegetation. The machine is also highly versatile, with a wide selection of cutting tools available to suit various applications. Useful features like the stop button, which automatically returns to the start position, and the manual fuel pump for easier starts after breaks, enhance efficiency and convenience on the job. As an established STIHL authorised dealer in the UK, Sims Garden Machinery has been advising customers for over 100 years. When you purchase a STIHL FS 91 from us, you get more than just a box. For local customers, we provide a complimentary Pre-Delivery Inspection (PDI) by our trained mechanics, ensuring your machine is assembled, tested, and ready to use. We also offer free local delivery and a comprehensive handover demonstration from our trained sales staff at our Stratford-upon-Avon showroom or your location, so you can operate your new brushcutter safely and effectively from day one. Not sure which machine or part is right for you? Our team is here to help. Contact us today for expert advice. Technical Specification Displacement 28.4 cm³ Power Output 0.95 kW / 1.3 HP Weight 5.8 kg ¹ Cutting Circle Diameter 420 mm Total Length (without cutting tool) 180 cm Tank Capacity 0.71 l Sound Pressure Level 94-96 dB(A) ² Sound Power Level 104 dB(A) ² Vibration Value, Left/Right 5.5 / 4.5 m/s² ³ ¹ without cutting tool and protection² K-value according to Directive 2006/42/EC = 2.0 dB(A)³ K-value according to RL 2006/42/EG = 2 m/s² Why buy from Sims Garden Machinery? Authorised main dealer We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on. Real people, real support No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help. Expert advice — not pushy sales Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine. Established, independent family business We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth. Frequently Asked Questions Who is the STIHL FS 91 best suited for? The STIHL FS 91 is designed for professional landscapers, groundskeepers, and discerning domestic users with large properties. Its power and robust construction make it ideal for clearing extensive areas of tough, dense grass, weeds, and light scrub that would overwhelm a standard grass trimmer. What is a STIHL 4-MIX® engine? The STIHL 4-MIX® engine is an innovative four-stroke engine that runs on a petrol-oil mixture, just like a two-stroke. This design provides the high torque and power of a four-stroke engine but without the complex oil circuits, making it lighter, easier to maintain, and offering a more pleasant sound during operation. What comes included with the STIHL FS 91 brushcutter? The STIHL FS 91 comes as a comprehensive package ready for work. It includes the brushcutter powerhead, a comfortable ADVANCE universal double shoulder harness, an AutoCut C 26-2 nylon line mowing head, and a GrassCut 230-2 metal cutting blade for tougher vegetation. Can the bike handle be adjusted easily? Yes, the ergonomic bike handle on the FS 91 features tool-free adjustment. A central clamping device allows you to quickly and easily adjust the handle to your preferred position for optimal comfort and control. It can also be rotated 90 degrees for easier transport and more compact storage. Is the STIHL FS 91 comfortable for long periods of use? While the machine weighs 5.8 kg (without the cutting tool), it is designed for comfortable extended use. The included ADVANCE universal harness effectively distributes the weight across your shoulders and back, while the integrated STIHL anti-vibration system significantly reduces the vibrations felt by the operator, minimising fatigue over long working sessions. User Manuals / Downloads View STIHL Brochure