Instruction Manual
Page 3
...must be recycled. Make sure your STIHL trimmer / 48 brushcutter, it is protected by Dealer 41 { FS 90, FS 90 R Maintenance and Care Main Parts Specifications Maintenance and Repairs Disposal STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions...33 Operating Instructions 35 Cleaning the Air Filter 35 Engine Management 35 Adjusting the Carburetor 36 Spark Arresting Screen in Muffler 36 Spark Plug 37 Engine Running Behavior 38 Lubricating the Gearbox 38 Storing the Machine 38 Sharpening Metal ...
...must be recycled. Make sure your STIHL trimmer / 48 brushcutter, it is protected by Dealer 41 { FS 90, FS 90 R Maintenance and Care Main Parts Specifications Maintenance and Repairs Disposal STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions...33 Operating Instructions 35 Cleaning the Air Filter 35 Engine Management 35 Adjusting the Carburetor 36 Spark Arresting Screen in Muffler 36 Spark Plug 37 Engine Running Behavior 38 Lubricating the Gearbox 38 Storing the Machine 38 Sharpening Metal ...
Instruction Manual
Page 9
... check your power tool for proper condition and operation before using it is securely mounted on the spark plug - The throttle trigger must be seen in that chart, some cutting attachments may cause arcing that the spark plug boot is damaged, improperly adjusted or maintained, or not completely or securely assembled. Have the machine... pump (only for power tools equipped with the proper deflector, handle and harness for cracked or damaged heads or cracked, bent, warped or damaged blades. FS 90, FS 90 R 7
... check your power tool for proper condition and operation before using it is securely mounted on the spark plug - The throttle trigger must be seen in that chart, some cutting attachments may cause arcing that the spark plug boot is damaged, improperly adjusted or maintained, or not completely or securely assembled. Have the machine... pump (only for power tools equipped with the proper deflector, handle and harness for cracked or damaged heads or cracked, bent, warped or damaged blades. FS 90, FS 90 R 7
Instruction Manual
Page 13
... The muffler and other hard object, sparks may shatter at regular intervals. Remove excess lubricant and all debris such as a result of the muffler. To reduce the risk of hot particles. Your muffler is hot. FS 90, FS 90 R 11 Flammable materials can ignite flammable... materials under certain circumstances. Grass, weeds, etc. To reduce the risk of injury, always shut off the engine and remove the spark plug boot before replacing the cutting attachment. Have your muffler serviced and repaired by a STIHL ...
... The muffler and other hard object, sparks may shatter at regular intervals. Remove excess lubricant and all debris such as a result of the muffler. To reduce the risk of hot particles. Your muffler is hot. FS 90, FS 90 R 11 Flammable materials can ignite flammable... materials under certain circumstances. Grass, weeds, etc. To reduce the risk of injury, always shut off the engine and remove the spark plug boot before replacing the cutting attachment. Have your muffler serviced and repaired by a STIHL ...
Instruction Manual
Page 17
...against the tree during the cutting process. Wear gloves when handling or performing maintenance on "Mounting the Deflector"). Always press the spark plug boot snugly onto FS 90, FS 90 R 15 Have such work performed by a kickout, never use a circular saw blade. This limit stop against the tree...to reduce the risk of the trimmer / brushcutter. WARNING Always stop deflector (see chapter on blades. WARNING Use only identical STIHL replacement parts for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used by experienced...
...against the tree during the cutting process. Wear gloves when handling or performing maintenance on "Mounting the Deflector"). Always press the spark plug boot snugly onto FS 90, FS 90 R 15 Have such work performed by a kickout, never use a circular saw blade. This limit stop against the tree...to reduce the risk of the trimmer / brushcutter. WARNING Always stop deflector (see chapter on blades. WARNING Use only identical STIHL replacement parts for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used by experienced...
Instruction Manual
Page 18
...4443 of the machine. WARNING Never test the ignition system with the spark plug boot removed from the spark plug or with a pressure washer. Keep blades sharp. Store the power tool in the instruction manual. 16 FS 90, FS 90 R The owner/operator of children. In California, it must be securely... attached.) A loose connection between the spark plug and the ignition wire connector in the boot may create arcing that the ...
...4443 of the machine. WARNING Never test the ignition system with the spark plug boot removed from the spark plug or with a pressure washer. Keep blades sharp. Store the power tool in the instruction manual. 16 FS 90, FS 90 R The owner/operator of children. In California, it must be securely... attached.) A loose connection between the spark plug and the ignition wire connector in the boot may create arcing that the ...
Instruction Manual
Page 34
... the throttle trigger slightly N Let the engine warm up briefly If the engine does not start N Set slide control to STOP-0 N Remove the spark plug - at the stop sign h to run F - the engine begins to the starting throttle position - As soon as engine is now ready for...engine starts - to do not touch the throttle trigger or throttle trigger lockout while doing so - the slide control jumps to e. see "Spark plug" N Dry the spark plug 32 FS 90, FS 90 R N Turn the choke knob to run F - English Starting Switching off the engine N Push the slide control in a secure position...
... the throttle trigger slightly N Let the engine warm up briefly If the engine does not start N Set slide control to STOP-0 N Remove the spark plug - at the stop sign h to run F - the engine begins to the starting throttle position - As soon as engine is now ready for...engine starts - to do not touch the throttle trigger or throttle trigger lockout while doing so - the slide control jumps to e. see "Spark plug" N Dry the spark plug 32 FS 90, FS 90 R N Turn the choke knob to run F - English Starting Switching off the engine N Push the slide control in a secure position...
Instruction Manual
Page 35
...the transport guard for brush knife 250-3. 681BA268 KN If a brush knife is fitted: English 681BA269 KN If a grass cutting blade 230 is fitted: FS 90, FS 90 R 33 Transport guards are also available as special accessories. see "Adjusting the throttle cable" If the tank has been drained completely N After refueling, ... temperature N Restart the engine Transporting the Unit Using a transport guard The type of metal cutting attachment supplied with the starter - see "Spark plug" N Set the slide control to START N Turn the choke knob to clear the combustion chamber N Replace the...
...the transport guard for brush knife 250-3. 681BA268 KN If a brush knife is fitted: English 681BA269 KN If a grass cutting blade 230 is fitted: FS 90, FS 90 R 33 Transport guards are also available as special accessories. see "Adjusting the throttle cable" If the tank has been drained completely N After refueling, ... temperature N Restart the engine Transporting the Unit Using a transport guard The type of metal cutting attachment supplied with the starter - see "Spark plug" N Set the slide control to START N Turn the choke knob to clear the combustion chamber N Replace the...
Instruction Manual
Page 39
...poorly at idling speed, first check the spark plug. dirty air filter, - N Check electrode gap (A) and readjust if necessary - N Use only resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Rectify problems which may result in ... 2 WARNING To reduce the risk of the approved range. FS 90, FS 90 R 37 Wrong fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. N Unscrew the spark plug. Spark Plug Checking the Spark Plug English 249BA063 KN 000BA039 KN 002BA363 KN If engine is down...
...poorly at idling speed, first check the spark plug. dirty air filter, - N Check electrode gap (A) and readjust if necessary - N Use only resistor type spark plugs of fire and burn injury, use only spark plugs authorized by STIHL. Rectify problems which may result in ... 2 WARNING To reduce the risk of the approved range. FS 90, FS 90 R 37 Wrong fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. N Unscrew the spark plug. Spark Plug Checking the Spark Plug English 249BA063 KN 000BA039 KN 002BA363 KN If engine is down...
Instruction Manual
Page 44
... not rotate X X Adjust idle speed Spark plug Adjust electrode gap Replace after every 100 operating hours Visual inspection X Cooling inlets Clean Cylinder fins Clean 2) Valve clearance Have combustion chamber (CARB only) Check and, if necessary, have adjusted by dealer after first 139 hours of operation 42 X X X X X X X X X X X X X X X X X X X FS 90, FS 90 R If your daily working time is...
... not rotate X X Adjust idle speed Spark plug Adjust electrode gap Replace after every 100 operating hours Visual inspection X Cooling inlets Clean Cylinder fins Clean 2) Valve clearance Have combustion chamber (CARB only) Check and, if necessary, have adjusted by dealer after first 139 hours of operation 42 X X X X X X X X X X X X X X X X X X X FS 90, FS 90 R If your daily working time is...
Instruction Manual
Page 46
English Main Parts 8 79 12 3 2 5 1 6 # 18 11 10 10 4 14 17 15 16 19 13 20 11 8 9 7 1 Fuel Filler Cap 2 Carburetor Adjusting Screws 3 Starter Grip 4 Spark Plug Boot 5 Muffler with Spark Arresting Screen 6 Bike Handle 7 Throttle Trigger 8 Slide Control 9 Throttle Trigger Lockout 10 Throttle Cable Retainer 11 Carrying Ring 12 Manual Fuel Pump 13 Choke Knob 14 Air Filter Cover 15 Fuel Tank 16 Machine Support 17 Handle Support 18 Wing Screw 19 Loop Handle 20 Barrier Bar # Serial Number 249BA069 KN 44 FS 90, FS 90 R
English Main Parts 8 79 12 3 2 5 1 6 # 18 11 10 10 4 14 17 15 16 19 13 20 11 8 9 7 1 Fuel Filler Cap 2 Carburetor Adjusting Screws 3 Starter Grip 4 Spark Plug Boot 5 Muffler with Spark Arresting Screen 6 Bike Handle 7 Throttle Trigger 8 Slide Control 9 Throttle Trigger Lockout 10 Throttle Cable Retainer 11 Carrying Ring 12 Manual Fuel Pump 13 Choke Knob 14 Air Filter Cover 15 Fuel Tank 16 Machine Support 17 Handle Support 18 Wing Screw 19 Loop Handle 20 Barrier Bar # Serial Number 249BA069 KN 44 FS 90, FS 90 R
Instruction Manual
Page 47
... and legs clear of the engine. 8 Slide Control For starting the engine. 4 Spark Plug Boot Connects the spark plug with the ignition lead. 5 Muffler with Skirt for all Mowing Attachments 5 Skirt 6 Metal Mowing Tool 002BA114 KN FS 90, FS 90 R 45 Definitions 1 Fuel Filler Cap For closing the fuel tank. 2 Carburetor Adjusting... Controls the speed of the cutting tool. English 2 1 3 45 1 3 6 4 1 Mowing Head 2 Deflector for Mowing Heads 3 Line Limiting Blade 4 Deflector with Spark Arresting Screen Muffler reduces engine exhaust noise and diverts exhaust gases away from operator.
... and legs clear of the engine. 8 Slide Control For starting the engine. 4 Spark Plug Boot Connects the spark plug with the ignition lead. 5 Muffler with Skirt for all Mowing Attachments 5 Skirt 6 Metal Mowing Tool 002BA114 KN FS 90, FS 90 R 45 Definitions 1 Fuel Filler Cap For closing the fuel tank. 2 Carburetor Adjusting... Controls the speed of the cutting tool. English 2 1 3 45 1 3 6 4 1 Mowing Head 2 Deflector for Mowing Heads 3 Line Limiting Blade 4 Deflector with Spark Arresting Screen Muffler reduces engine exhaust noise and diverts exhaust gases away from operator.
Instruction Manual
Page 49
...identified by authorized STIHL servicing dealers. The symbol may appear alone on small parts. output shaft speed (cutting attachment): 7,500 rpm Valve clearance Inlet valve: 0.10 mm (0.004 in) Exhaust valve: 0.10 mm (0.004 in) Ignition System Electronic magneto ignition Spark plug (resistor type... Fuel tank capacity: 0.53 l (17.9 fl.oz) Weight Overall length without cutting attachment and deflector FS 90: 5.8 kg (12.8 lbs) FS 90 R: 5.5 kg (12.1 lbs) FS 90, FS 90 R 47 Genuine STIHL parts can be performed only by the STIHL part number, the { logo and, in this manual.
...identified by authorized STIHL servicing dealers. The symbol may appear alone on small parts. output shaft speed (cutting attachment): 7,500 rpm Valve clearance Inlet valve: 0.10 mm (0.004 in) Exhaust valve: 0.10 mm (0.004 in) Ignition System Electronic magneto ignition Spark plug (resistor type... Fuel tank capacity: 0.53 l (17.9 fl.oz) Weight Overall length without cutting attachment and deflector FS 90: 5.8 kg (12.8 lbs) FS 90 R: 5.5 kg (12.1 lbs) FS 90, FS 90 R 47 Genuine STIHL parts can be performed only by the STIHL part number, the { logo and, in this manual.
Instruction Manual
Page 51
...Bring the product to the owner. The following list specifically defines the emission-related warranted parts: - Air Filter - Control Linkages - Spark Plug - Injection Valve (if applicable) - Throttle Housing (if applicable) - Fuel Line - If you have signed and sent back ...Deviations from defects in this recommendation FS 90, FS 90 R 49 Warranty Period The warranty period will be performed at no cost to any authorized STIHL servicing dealer or warranty station. Fuel Tank - Clamps - Fly Wheel - Warranty Work STIHL Incorporated shall remedy warranty defects at ...
...Bring the product to the owner. The following list specifically defines the emission-related warranted parts: - Air Filter - Control Linkages - Spark Plug - Injection Valve (if applicable) - Throttle Housing (if applicable) - Fuel Line - If you have signed and sent back ...Deviations from defects in this recommendation FS 90, FS 90 R 49 Warranty Period The warranty period will be performed at no cost to any authorized STIHL servicing dealer or warranty station. Fuel Tank - Clamps - Fly Wheel - Warranty Work STIHL Incorporated shall remedy warranty defects at ...
Instruction Manual
Page 54
...174; 52 FS 90, FS 90 R Emission Warranty Parts List Air Filter, Carburetor (if applicable), Fuel Pump, Choke (Cold Start Enrichment System) (if applicable), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module or Electronic Control Unit), Fly Wheel, Spark Plug, Injection Valve...replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL Incorporated demonstrates that the STIHL product has been abused, neglected, or improperly maintained, and that has a factory installed, and ...
...174; 52 FS 90, FS 90 R Emission Warranty Parts List Air Filter, Carburetor (if applicable), Fuel Pump, Choke (Cold Start Enrichment System) (if applicable), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module or Electronic Control Unit), Fly Wheel, Spark Plug, Injection Valve...replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL Incorporated demonstrates that the STIHL product has been abused, neglected, or improperly maintained, and that has a factory installed, and ...
