A professional bike-handle trimmer with simplified starting, improved air filtration and 30% longer run time than the FS 90. Model Features Simplified Starting ProcedureTo get started, simply pump the fuel primer, set the choke and pull the starter cord. The built-in stop switch allows the user to turn off the engine with a simple press of the button. When the engine is off, the throttle lock automatically returns to the “start” setting. Your power tool will be ready to be started when you’re ready to get back to work.See it in action! IntelliCarb™ Compensating CarburetorThe IntelliCarb™ Compensating Carburetor measures the air pressure on the clean side of the air filter and adjusts the metering diaphragm in the carburetor. This keeps the RPM at a consistent level, even when the air filter begins to clog. Loop Handle (R)Loop handle grass trimmers and brushcutters are ideal for trimming between bushes and shrubs and other areas where space is limited. Anti-Vibration SystemSTIHL 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. Built in the USAA majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components. More Information Reduced-Emission Engine Technology - Caring for NatureThe 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. More Information Shoulder Strap / Carrying SystemUsing a shoulder strap or carrying system helps distribute the weight of the equipment for increased operator comfort and improved maneuverability. Bike HandleWhen used in conjunction with a harness, the bike handle allows the machine to be easily guided, enabling a smooth horizontal mowing action to cover large areas quickly and efficiently. With soft grips for increased comfort, the bike handle provides greater control and helps reduce operator fatigue.See it in action! Multi-Function Control HandleHaving 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. Tool-Free Handle AdjustmentThe central wing nut enables easy adjustment without the use of tools. For transportation and space-saving storage, the handle can be rotated 90°. Cutting Heads & Blades Selection ChartNeed help selecting a cutting head or blade for your STIHL trimmer or brushcutter?Click here to view the Cutting Heads & Blades Selection Chart (PDF Format). Purge Pump PrimerBy 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. Fully Lined Drive ShaftProvides smooth operation and less vibration. High Tech Polymer HousingHousings are lightweight, withstand greater impact and are corrosion-resistant. Protected Choke Lever/KnobHelps prevent damage. Throttle Trigger InterlockMust be depressed before the trigger can be activated. Air Filter CoverEasily removed for fast and easy filter cleaning or replacement. Protected or Enclosed Control CablesEliminate dangling and loose wires. Heavy-Duty Steel-On-Steel ClutchCentrifugal clutch is designed to reduce slippage. Protected Spark PlugProtected yet easy to change. Protected Spark Arrestor MufflerHas large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks. Upright Translucent Fuel TankAllows operator to easily check fuel level before starting work. Upright position makes it easier to refill. FS 91 Specifications POWER SOURCE Gas WEIGHT 12.8 lbs. CUTTING WIDTH 16.5 in. ENGINE POWER 1.27 bhp FUEL CAPACITY 24.0 oz. DISPLACEMENT 1.73 cu. in.
