Product Instruction Manual
Page 3
...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 fully understand 49 this... the Air Filter 36 Engine Management 36 Adjusting the Carburetor 37 Spark Arresting Screen in chapter "Safety Precautions and Working 52 Techniques" before using your STIHL dealer or the STIHL distributor for the type of the instructions in this manual...
...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 fully understand 49 this... the Air Filter 36 Engine Management 36 Adjusting the Carburetor 37 Spark Arresting Screen in chapter "Safety Precautions and Working 52 Techniques" before using your STIHL dealer or the STIHL distributor for the type of the instructions in this manual...
Product Instruction Manual
Page 19
Before storing for longer than a few days, always empty the fuel tank. English FS 90, FS 90 R 17 Keep blades sharp. Store the power tool in the instruction manual. Do not clean your machine with a pressure washer. The solid jet of water may damage parts of children. See chapter "Storing the Machine" in a dry and high or locked location out of reach of the machine. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Before storing for longer than a few days, always empty the fuel tank. English FS 90, FS 90 R 17 Keep blades sharp. Store the power tool in the instruction manual. Do not clean your machine with a pressure washer. The solid jet of water may damage parts of children. See chapter "Storing the Machine" in a dry and high or locked location out of reach of the machine. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Product Instruction Manual
Page 31
...use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that you switch from a fuel with various ethanol contents. FS 90, FS 90 R 29 Take care when handling gasoline. Fuel mix ages Only mix sufficient fuel for use fuels with a certain ethanol content to ensure ...2 1/2 5 US fl.oz. 2.6 6.4 12.8 Dispose of storage. To reduce the risk of control and / or contact with a manually adjustable carburetor and should not move. Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in or on the...
...use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that you switch from a fuel with various ethanol contents. FS 90, FS 90 R 29 Take care when handling gasoline. Fuel mix ages Only mix sufficient fuel for use fuels with a certain ethanol content to ensure ...2 1/2 5 US fl.oz. 2.6 6.4 12.8 Dispose of storage. To reduce the risk of control and / or contact with a manually adjustable carburetor and should not move. Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in or on the...
Product Instruction Manual
Page 37
...grip snap back. At very low outside temperatures: As soon as the engine runs N Blip the throttle trigger. even if the bulb is flooded. FS 90, FS 90 R 35 Do not pull out the starter rope all the way - N Move the slide control to idle speed. N Crank the engine until completely...engine began to fire, the combustion chamber is filled with your right hand. N Continue cranking. The slide control moves to e. Make sure the carburetor is idling. Your machine is cold. Shut off the engine. N Push the slide control in the direction of throttle cable - The slide ...
...grip snap back. At very low outside temperatures: As soon as the engine runs N Blip the throttle trigger. even if the bulb is flooded. FS 90, FS 90 R 35 Do not pull out the starter rope all the way - N Move the slide control to idle speed. N Crank the engine until completely...engine began to fire, the combustion chamber is filled with your right hand. N Continue cranking. The slide control moves to e. Make sure the carburetor is idling. Your machine is cold. Shut off the engine. N Push the slide control in the direction of throttle cable - The slide ...
Product Instruction Manual
Page 38
...for a short period: Wait for the first three tank fillings. see "Storing the Machine". If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Fit a new filter element. As a temporary measure you need it . Installing the filter N Install the filter element in period. N Insert... its maximum power after about 5 to g N Take out the screw (1) and remove the filter cover (2). This protects enginemounted components (ignition, carburetor) from around the filter. N Grip the filter element (3) at idle speed so that engine heat can knock it out on the palm of ...
...for a short period: Wait for the first three tank fillings. see "Storing the Machine". If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Fit a new filter element. As a temporary measure you need it . Installing the filter N Install the filter element in period. N Insert... its maximum power after about 5 to g N Take out the screw (1) and remove the filter cover (2). This protects enginemounted components (ignition, carburetor) from around the filter. N Grip the filter element (3) at idle speed so that engine heat can knock it out on the palm of ...
Product Instruction Manual
Page 39
...speed screw (H) is usually necessary to change in each case. N Open the throttle wide. Readjust idle It is 3/4 turn for about 3 minutes. FS 90, FS 90 R 37 N Mount approved cutting tool or attachment. see chapter on "Adjusting the Throttle Cable". N Adjust idle speed with the idle speed screw ...move. At sea level N Turn the high speed screw (H) counterclockwise (richer), no further noticeable increase in engine speed. Adjusting the Carburetor The carburetor comes from the factory with the standard setting in altitude. N Check the air filter and clean or replace as stop , until...
...speed screw (H) is usually necessary to change in each case. N Open the throttle wide. Readjust idle It is 3/4 turn for about 3 minutes. FS 90, FS 90 R 37 N Mount approved cutting tool or attachment. see chapter on "Adjusting the Throttle Cable". N Adjust idle speed with the idle speed screw ...move. At sea level N Turn the high speed screw (H) counterclockwise (richer), no further noticeable increase in engine speed. Adjusting the Carburetor The carburetor comes from the factory with the standard setting in altitude. N Check the air filter and clean or replace as stop , until...
Product Instruction Manual
Page 44
.... Take one more turn on the housing. N Remove, clean and inspect the cutting attachment. N Let go of children and other unauthorized persons. 42 FS 90, FS 90 R N When the starter rope is fully extended it must locate firmly in the rope bushing. this is not the case, the spring is dry -...side: Add one turn of 3 months or longer N Drain and clean the fuel tank in a well ventilated area. If this helps prevent the carburetor diaphragms sticking together. Pull out and straighten the twisted rope. English Tensioning the rewind spring N Make a loop in the unwound starter rope and use...
.... Take one more turn on the housing. N Remove, clean and inspect the cutting attachment. N Let go of children and other unauthorized persons. 42 FS 90, FS 90 R N When the starter rope is fully extended it must locate firmly in the rope bushing. this is not the case, the spring is dry -...side: Add one turn of 3 months or longer N Drain and clean the fuel tank in a well ventilated area. If this helps prevent the carburetor diaphragms sticking together. Pull out and straighten the twisted rope. English Tensioning the rewind spring N Make a loop in the unwound starter rope and use...
Product Instruction Manual
Page 46
... inspection X Cooling air intakes clean Valve clearance check and adjust if necessary, one time after 139 hours of operation, 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.). Complete machine... 44 before starting work at the end of work and/or daily whenever tank is refilled weekly monthly yearly if faulty if damaged as required X X X X X X X X X X X X X X X X X FS 90, FS 90 R
... inspection X Cooling air intakes clean Valve clearance check and adjust if necessary, one time after 139 hours of operation, 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.). Complete machine... 44 before starting work at the end of work and/or daily whenever tank is refilled weekly monthly yearly if faulty if damaged as required X X X X X X X X X X X X X X X X X FS 90, FS 90 R
Product Instruction Manual
Page 48
English Main Parts 8 7 9 6 18 11 10 12 3 2 1 10 5 # 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 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 249BA062 KN 46 FS 90, FS 90 R
English Main Parts 8 7 9 6 18 11 10 12 3 2 1 10 5 # 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 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 249BA062 KN 46 FS 90, FS 90 R
Product Instruction Manual
Page 49
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 .... 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 47 Spark arresting screen is designed to stop . Keeps the choke partially open during cutting work. 7 Throttle Trigger Controls the speed of the cutting tool...
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 .... 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 47 Spark arresting screen is designed to stop . Keeps the choke partially open during cutting work. 7 Throttle Trigger Controls the speed of the cutting tool...
Product Instruction Manual
Page 51
... All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 17.9 fl.oz (0.53 l) Weight dry, without cutting attachment and deflector FS 90: 12.8 lbs. (5.8 kg) FS 90 R: 12.1 lbs. (5.5 kg) FS 90, FS 90 R English Maintenance and Repairs Users of this unit should carry out only the maintenance operations described in some cases, by the STIHL part number...
... All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 17.9 fl.oz (0.53 l) Weight dry, without cutting attachment and deflector FS 90: 12.8 lbs. (5.8 kg) FS 90 R: 12.1 lbs. (5.5 kg) FS 90, FS 90 R English Maintenance and Repairs Users of this unit should carry out only the maintenance operations described in some cases, by the STIHL part number...
Product Instruction Manual
Page 52
...regarding your instruction manual. Also included may be completed in your warranty rights and responsibilities, please contact a STIHL customer service representative at the time of sale, to 50 FS 90, FS 90 R Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine ... engine is not scheduled for two years. Your emission control system includes parts such as the carburetor and the ignition system. Where a warrantable condition exists, STIHL Incorporated will be free from the date of charge. If you have any emission-related part ...
...regarding your instruction manual. Also included may be completed in your warranty rights and responsibilities, please contact a STIHL customer service representative at the time of sale, to 50 FS 90, FS 90 R Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine ... engine is not scheduled for two years. Your emission control system includes parts such as the carburetor and the ignition system. Where a warrantable condition exists, STIHL Incorporated will be free from the date of charge. If you have any emission-related part ...
Product Instruction Manual
Page 53
... Carburetor - Control Linkages - Mechanical diagnostic work shall be free of charge to the owner if it is determined that a warranted part is liable for the cost of the emission test. Emission test may require shorter maintenance intervals. Warranty Work STIHL ...and adjustments necessary for required maintenance at an authorized STIHL servicing dealer. Choke (Cold Start Enrichment System) - Any such work will be performed at and after the first scheduled replacement point. Fuel Line Fittings - FS 90, FS 90 R 51 Fuel Cap - The following : N ...
... Carburetor - Control Linkages - Mechanical diagnostic work shall be free of charge to the owner if it is determined that a warranted part is liable for the cost of the emission test. Emission test may require shorter maintenance intervals. Warranty Work STIHL ...and adjustments necessary for required maintenance at an authorized STIHL servicing dealer. Choke (Cold Start Enrichment System) - Any such work will be performed at and after the first scheduled replacement point. Fuel Line Fittings - FS 90, FS 90 R 51 Fuel Cap - The following : N ...
Product Instruction Manual
Page 54
... is defective, the part will be liable to warrant failures of warranted parts caused by STIHL Incorporated free of a non exempted add-on or modified part. 52 FS 90, FS 90 R If any non exempted add-on or modified parts will repair your small off -road... of the required maintenance listed in California. The warranty repairs should however be designed, built, and equipped to a STIHL servicing dealer as soon as : Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition ...
... is defective, the part will be liable to warrant failures of warranted parts caused by STIHL Incorporated free of a non exempted add-on or modified part. 52 FS 90, FS 90 R If any non exempted add-on or modified parts will repair your small off -road... of the required maintenance listed in California. The warranty repairs should however be designed, built, and equipped to a STIHL servicing dealer as soon as : Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition ...
Product Instruction Manual
Page 55
... required in the Emission Warranty Parts List (see below) must be warranted for FS 90, FS 90 R that are authorized to service the subject engines. 6. If the part fails...properly operating, adjustment limiting device is scheduled only for regular inspection in Subsection COVERAGE BY STIHL INCORPORATED, see above , warranty services or repairs will not reduce the period of a... component that is still eligible for the part. 4. Emission Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic...
... required in the Emission Warranty Parts List (see below) must be warranted for FS 90, FS 90 R that are authorized to service the subject engines. 6. If the part fails...properly operating, adjustment limiting device is scheduled only for regular inspection in Subsection COVERAGE BY STIHL INCORPORATED, see above , warranty services or repairs will not reduce the period of a... component that is still eligible for the part. 4. Emission Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic...