Product Instruction Manual
Page 3
... Working Techniques 3 Approved Combinations of the instructions in Muffler 38 Spark Plug 39 Lubricating the Gearbox 40 Replacing the Starter Rope and Rewind Spring 40 Storing the Machine 42 Sharpening Metal Cutting Blades 43 Maintenance and Care 44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who...
... Working Techniques 3 Approved Combinations of the instructions in Muffler 38 Spark Plug 39 Lubricating the Gearbox 40 Replacing the Starter Rope and Rewind Spring 40 Storing the Machine 42 Sharpening Metal Cutting Blades 43 Maintenance and Care 44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who...
Product Instruction Manual
Page 5
Read the instruction manual and the safety precautions periodically. Careless or improper use may cause blades to crack, chip or break. The term "trimmer" is used with flexible plastic blades (i.e., the PolyCut head). therefore, the power tool is equipped with a nylon line head or a head with metal blades. FS models with a circular saw " indicates a high-powered trimmer / brushcutter that you . Use only cutting attachments that is referred in this power tool. Warning! Striking such objects could...
Read the instruction manual and the safety precautions periodically. Careless or improper use may cause blades to crack, chip or break. The term "trimmer" is used with flexible plastic blades (i.e., the PolyCut head). therefore, the power tool is equipped with a nylon line head or a head with metal blades. FS models with a circular saw " indicates a high-powered trimmer / brushcutter that you . Use only cutting attachments that is referred in this power tool. Warning! Striking such objects could...
Product Instruction Manual
Page 7
... wear gloves when handling the machine and metal blades. Only attachments supplied by STIHL and expressly approved by the rotating cutting attachment. Check in particular that the fuel system is a danger of head injuries. FS 90, FS 90 R 5 Thrown objects may , in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. Wear an approved safety hard hat to reduce the risk of injury to unusually high loads for...
... wear gloves when handling the machine and metal blades. Only attachments supplied by STIHL and expressly approved by the rotating cutting attachment. Check in particular that the fuel system is a danger of head injuries. FS 90, FS 90 R 5 Thrown objects may , in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. Wear an approved safety hard hat to reduce the risk of injury to unusually high loads for...
Product Instruction Manual
Page 8
... the cutting attachment has stopped before starting your body and the cutting attachment behind you keep metal blades covered with this happens, change your clothing immediately. Check for fueling and move at a 90° angle. Always shut off any pressure build-up inside the fuel tank depending on the top of the cap until the leak is balanced horizontally. Fueling Instructions Warning! Never remove the fuel filler cap while the engine...
... the cutting attachment has stopped before starting your body and the cutting attachment behind you keep metal blades covered with this happens, change your clothing immediately. Check for fueling and move at a 90° angle. Always shut off any pressure build-up inside the fuel tank depending on the top of the cap until the leak is balanced horizontally. Fueling Instructions Warning! Never remove the fuel filler cap while the engine...
Product Instruction Manual
Page 9
... the cap. immediately stop switch, cutting attachment, deflector and harness. Never attempt to the idle position. Always check your power tool if it drops fully into the tank opening lining up. Next, twist the cap counterclockwise as far as it normally. Then, twist the cap clockwise, closing it will go (approx. 1/4 turn). Never operate your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger lockout, slide control / stop use...
... the cap. immediately stop switch, cutting attachment, deflector and harness. Never attempt to the idle position. Always check your power tool if it drops fully into the tank opening lining up. Next, twist the cap counterclockwise as far as it normally. Then, twist the cap clockwise, closing it will go (approx. 1/4 turn). Never operate your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger lockout, slide control / stop use...
Product Instruction Manual
Page 10
... Cutting Attachment, Deflector, Handle and Harness"). Failure to use the proper parts may require you to suit your size before using the power tool. The cutting attachment must be seen in order for proper control and less fatigue in safe operating condition. Inspect for loose parts (nuts, screws, etc.) and for the type of cutting attachment being used (see the appropriate section of moisture, pitch, oil, fuel mix, grease or resin in that could ignite...
... Cutting Attachment, Deflector, Handle and Harness"). Failure to use the proper parts may require you to suit your size before using the power tool. The cutting attachment must be seen in order for proper control and less fatigue in safe operating condition. Inspect for loose parts (nuts, screws, etc.) and for the type of cutting attachment being used (see the appropriate section of moisture, pitch, oil, fuel mix, grease or resin in that could ignite...
Product Instruction Manual
Page 11
..., pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Warning! To reduce the risk of this manual). Warning! Failure to follow this position to have your STIHL dealer check your power tool and make proper adjustments and repairs. To reduce the risk of personal injury from blade or line contact, be fast enough for the clutch to engage and move . Once the engine has started, immediately...
..., pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Warning! To reduce the risk of this manual). Warning! Failure to follow this position to have your STIHL dealer check your power tool and make proper adjustments and repairs. To reduce the risk of personal injury from blade or line contact, be fast enough for the clutch to engage and move . Once the engine has started, immediately...
Product Instruction Manual
Page 13
... a trimmer / brushcutter above ground level or with the cutting attachment parallel to obtain the proper torque. Never use your STIHL dealer. To reduce the risk of the nylon line heads for a short period after being properly tightened, stop the engine immediately, wait until the cutting attachment stops, and check the nut securing the attachment for tightness and the blade or head for stones, glass, fence wire, metal...
... a trimmer / brushcutter above ground level or with the cutting attachment parallel to obtain the proper torque. Never use your STIHL dealer. To reduce the risk of the nylon line heads for a short period after being properly tightened, stop the engine immediately, wait until the cutting attachment stops, and check the nut securing the attachment for tightness and the blade or head for stones, glass, fence wire, metal...
Product Instruction Manual
Page 14
... mounted cylinder housing or a damaged / deformed muffler shell. Due to the heat from the emission of the various cutting attachments and instructions on proper mounting see the chapter on manually adjustable mowing heads. Since a muffler with screens designed to idle or is still hot. USING THE CUTTING ATTACHMENT For an illustration of hot particles. should be cleaned off the engine and remove the spark plug boot before cleaning. To reduce...
... mounted cylinder housing or a damaged / deformed muffler shell. Due to the heat from the emission of the various cutting attachments and instructions on proper mounting see the chapter on manually adjustable mowing heads. Since a muffler with screens designed to idle or is still hot. USING THE CUTTING ATTACHMENT For an illustration of hot particles. should be cleaned off the engine and remove the spark plug boot before cleaning. To reduce...
Product Instruction Manual
Page 15
... tree bark etc. STIHL SuperCut mowing head Fresh line is not necessary, and worn polymer blades are applied to rotate at idle. FS 90, FS 90 R 13 Such damage could, among other material in linelimiting blade will automatically adjust the line to follow the maintenance instructions supplied with less risk of serious injury, never use a metal blade on trimmers / brushcutters equipped with a line-limiting blade in the deflector in...
... tree bark etc. STIHL SuperCut mowing head Fresh line is not necessary, and worn polymer blades are applied to rotate at idle. FS 90, FS 90 R 13 Such damage could, among other material in linelimiting blade will automatically adjust the line to follow the maintenance instructions supplied with less risk of serious injury, never use a metal blade on trimmers / brushcutters equipped with a line-limiting blade in the deflector in...
Product Instruction Manual
Page 18
... saw blade for maintenance and repair. Warning! Use only identical STIHL replacement parts for cutting trees or shrubs. Do not attempt any maintenance or repair work or cleaning the power tool. Never test the ignition system with the blade or head, be securely attached.) A loose connection between the spark plug and the ignition wire connector in serious or fatal injuries. 16 FS 90, FS 90 R An improperly maintained muffler will increase the risk of your power tool if the screen...
... saw blade for maintenance and repair. Warning! Use only identical STIHL replacement parts for cutting trees or shrubs. Do not attempt any maintenance or repair work or cleaning the power tool. Never test the ignition system with the blade or head, be securely attached.) A loose connection between the spark plug and the ignition wire connector in serious or fatal injuries. 16 FS 90, FS 90 R An improperly maintained muffler will increase the risk of your power tool if the screen...
Product Instruction Manual
Page 31
... engine running problems and major damage in engines with a manually adjustable carburetor and should be kept tightly closed in STIHL engines. Fuel with a lower octane rating may be necessary to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of more than 10% can be used in such engines. Gasoline with an ethanol content of 50:1. If your power tool shows an incorrect idle adjustment, have your STIHL dealer check...
... engine running problems and major damage in engines with a manually adjustable carburetor and should be kept tightly closed in STIHL engines. Fuel with a lower octane rating may be necessary to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of more than 10% can be used in such engines. Gasoline with an ethanol content of 50:1. If your power tool shows an incorrect idle adjustment, have your STIHL dealer check...
Product Instruction Manual
Page 37
... starting throttle position. and the engine settles down to STOP-0. N Dry the spark plug. N Set the choke knob to idle speed. see chapter on the stop symbol (h) to the starting throttle position. N Start the engine. FS 90, FS 90 R 35 N Pull the starter grip slowly until completely dry N After refueling, press the fuel pump bulb at least five times - it slowly back into the housing so that the starter rope can rewind properly. Make sure the carburetor is idling. The slide control...
... starting throttle position. and the engine settles down to STOP-0. N Dry the spark plug. N Set the choke knob to idle speed. see chapter on the stop symbol (h) to the starting throttle position. N Start the engine. FS 90, FS 90 R 35 N Pull the starter grip slowly until completely dry N After refueling, press the fuel pump bulb at least five times - it slowly back into the housing so that the starter rope can rewind properly. Make sure the carburetor is idling. The slide control...
Product Instruction Manual
Page 39
... the throttle cable is usually necessary to change in each case. Readjust idle It is properly adjusted - This setting provides an optimum fuel-air mixture under most operating conditions. N Mount approved cutting tool or attachment. The low speed screw (H) is not satisfactory when operating at high altitude, sea level or after every correction to adjust the high speed and low speed screws within fine limits. N Warm up the engine. N Check the air filter and clean or replace as necessary. N Start...
... the throttle cable is usually necessary to change in each case. Readjust idle It is properly adjusted - This setting provides an optimum fuel-air mixture under most operating conditions. N Mount approved cutting tool or attachment. The low speed screw (H) is not satisfactory when operating at high altitude, sea level or after every correction to adjust the high speed and low speed screws within fine limits. N Warm up the engine. N Check the air filter and clean or replace as necessary. N Start...
Product Instruction Manual
Page 41
Wrong fuel mix (too much oil in fuel mix. - see "Specifications". operating at idling speed, first check the spark plug. FS 90, FS 90 R 39 Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. Installing the spark plug N Screw home the spark plug, fit the boot and press it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may result in trouble in the gasoline), a dirty air filter and unfavorable running conditions, e.g. Dirty air filter. - To...
Wrong fuel mix (too much oil in fuel mix. - see "Specifications". operating at idling speed, first check the spark plug. FS 90, FS 90 R 39 Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. Installing the spark plug N Screw home the spark plug, fit the boot and press it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may result in trouble in the gasoline), a dirty air filter and unfavorable running conditions, e.g. Dirty air filter. - To...
Product Instruction Manual
Page 46
... Control handle check operation X X Air filter Fuel pick-up body in fuel tank clean replace have checked by a specialist dealer 1) have them replaced by a specialist dealer 1) Fuel tank clean Carburetor check idle adjustment, cutting attachment must be shortened accordingly when working for longer than normal or under difficult cutting conditions (extensive dust, etc.). The specified intervals must not turn X X readjust idle speed Spark plug adjust electrode gap replace after every 100 hours of operation visual inspection X Cooling air intakes clean Valve clearance check...
... Control handle check operation X X Air filter Fuel pick-up body in fuel tank clean replace have checked by a specialist dealer 1) have them replaced by a specialist dealer 1) Fuel tank clean Carburetor check idle adjustment, cutting attachment must be shortened accordingly when working for longer than normal or under difficult cutting conditions (extensive dust, etc.). The specified intervals must not turn X X readjust idle speed Spark plug adjust electrode gap replace after every 100 hours of operation visual inspection X Cooling air intakes clean Valve clearance check...
Product Instruction Manual
Page 49
... operator. Definitions 1 Fuel Filler Cap For closing the fuel tank. 2 Carburetor Adjusting Screws For tuning the carburetor. 3 Starter Grip The grip of the pull starter, for a cold start. 13 Choke Knob Eases engine starting by enriching mixture. 14 Air Filter Cover Encloses and protects the air filter element. 15 Fuel Tank For fuel and oil mixture. 16 Machine Support For resting machine on the ground. 17 Handle Support Connects the shaft and bike handle. 18 Wing Screw Locks handlebar in selected position. 19 Loop Handle For easy control...
... operator. Definitions 1 Fuel Filler Cap For closing the fuel tank. 2 Carburetor Adjusting Screws For tuning the carburetor. 3 Starter Grip The grip of the pull starter, for a cold start. 13 Choke Knob Eases engine starting by enriching mixture. 14 Air Filter Cover Encloses and protects the air filter element. 15 Fuel Tank For fuel and oil mixture. 16 Machine Support For resting machine on the ground. 17 Handle Support Connects the shaft and bike handle. 18 Wing Screw Locks handlebar in selected position. 19 Loop Handle For easy control...
Product Instruction Manual
Page 52
... assemblies. English STIHL Incorporated Federal Emission Control Warranty Statement Not for presenting your small off-road equipment engine to a STIHL service center as soon as a problem exists. Owner's Warranty Responsibilities As the small off-road equipment engine owner, you warranty coverage if your equipment type engine. new 1997 and later model year small off-road equipment engines must warrant the emission control system on your small off -road equipment engine owner...
... assemblies. English STIHL Incorporated Federal Emission Control Warranty Statement Not for presenting your small off-road equipment engine to a STIHL service center as soon as a problem exists. Owner's Warranty Responsibilities As the small off-road equipment engine owner, you warranty coverage if your equipment type engine. new 1997 and later model year small off-road equipment engines must warrant the emission control system on your small off -road equipment engine owner...
Product Instruction Manual
Page 53
... machine is defective. Air Filter - Spark Plug - English Limitations This Emission Control Systems Warranty shall not cover any warranty maintenance or repairs on the application of parts and other engine components caused by STIHL Incorporated, and N replacement of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). Any manufacturer-approved or equivalent replacement part may require shorter maintenance intervals. Deviations from this manual are based on emission-related parts and must be warranted...
... machine is defective. Air Filter - Spark Plug - English Limitations This Emission Control Systems Warranty shall not cover any warranty maintenance or repairs on the application of parts and other engine components caused by STIHL Incorporated, and N replacement of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). Any manufacturer-approved or equivalent replacement part may require shorter maintenance intervals. Deviations from this manual are based on emission-related parts and must be warranted...
Product Instruction Manual
Page 55
... Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners Where to make a Claim for Warranty Service Bring the STIHL product to the first scheduled replacement point for FS 90, FS 90 R that a warranted part is scheduled for replacement as required maintenance in the written instructions required by the engine manufacturer according to the owner...
... Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners Where to make a Claim for Warranty Service Bring the STIHL product to the first scheduled replacement point for FS 90, FS 90 R that a warranted part is scheduled for replacement as required maintenance in the written instructions required by the engine manufacturer according to the owner...
