Product Instruction Manual
Page 3
... Harness 31 Balancing the Trimmer/Brushcutter 32 Starting / Stopping the Engine 33 Operating Instructions 36 Cleaning the Air Filter 36 Engine Management 36 Adjusting the Carburetor 37 Spark Arresting Screen in Muffler 38 Spark Plug 39 Lubricating ... 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 ...
... Harness 31 Balancing the Trimmer/Brushcutter 32 Starting / Stopping the Engine 33 Operating Instructions 36 Cleaning the Air Filter 36 Engine Management 36 Adjusting the Carburetor 37 Spark Arresting Screen in Muffler 38 Spark Plug 39 Lubricating ... 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 ...
Product Instruction Manual
Page 38
...high revs (full throttle off load) for a short while at the cutout (arrow) in the filter housing (4) and remove it down . If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Clean away loose dirt from thermal overload. Do not wash. For longer out-ofservice ...15 tank fillings. As a temporary measure you need it out with compressed air. Installing the filter N Install the filter element in the filter housing and fit the cover. English Operating Instructions Cleaning the Air Filter Engine Management During break-in period A factory-new machine should not be ...
...high revs (full throttle off load) for a short while at the cutout (arrow) in the filter housing (4) and remove it down . If there is a noticeable loss of any major hardware. 36 FS 90, FS 90 R N Clean away loose dirt from thermal overload. Do not wash. For longer out-ofservice ...15 tank fillings. As a temporary measure you need it out with compressed air. Installing the filter N Install the filter element in the filter housing and fit the cover. English Operating Instructions Cleaning the Air Filter Engine Management During break-in period A factory-new machine should not be ...
Product Instruction Manual
Page 39
... the idle speed screw (LA) so that the cutting attachment does not move. This setting provides an optimum fuel-air mixture under most operating conditions. N Check the air filter and clean or replace as necessary. At high altitude N Turn the high speed screw (H) clockwise (leaner), no ...idle speed screw (LA) after changing the working tool. 249BA051 KN English Rule of thumb: Turn the high speed screw (H) about 3 minutes. FS 90, FS 90 R 37 N Open the throttle wide. N Mount approved cutting tool or attachment. The high speed screw (H) is possible that the throttle cable...
... the idle speed screw (LA) so that the cutting attachment does not move. This setting provides an optimum fuel-air mixture under most operating conditions. N Check the air filter and clean or replace as necessary. At high altitude N Turn the high speed screw (H) clockwise (leaner), no ...idle speed screw (LA) after changing the working tool. 249BA051 KN English Rule of thumb: Turn the high speed screw (H) about 3 minutes. FS 90, FS 90 R 37 N Open the throttle wide. N Mount approved cutting tool or attachment. The high speed screw (H) is possible that the throttle cable...
Product Instruction Manual
Page 41
...power, difficult to form on the insulator nose which have caused fouling of fire and burn injury, use only spark plugs authorized by STIHL. N Check electrode gap (A) and readjust if necessary - Always press spark plug boot (1) snugly onto spark plug terminal (2) of ...boot and press it must be attached.) A loose connection between spark plug boot and ignition wire connector in the gasoline), a dirty air filter and unfavorable running conditions, e.g. FS 90, FS 90 R 39 Removing the spark plug N Move the slide control to STOP-0. 1 N Pull off the spark plug boot (1). N ...
...power, difficult to form on the insulator nose which have caused fouling of fire and burn injury, use only spark plugs authorized by STIHL. N Check electrode gap (A) and readjust if necessary - Always press spark plug boot (1) snugly onto spark plug terminal (2) of ...boot and press it must be attached.) A loose connection between spark plug boot and ignition wire connector in the gasoline), a dirty air filter and unfavorable running conditions, e.g. FS 90, FS 90 R 39 Removing the spark plug N Move the slide control to STOP-0. 1 N Pull off the spark plug boot (1). N ...
Product Instruction Manual
Page 44
... of the arrow. If the grip droops to rotate the rotor another half turn on the housing. N Dispose of children and other unauthorized persons. 42 FS 90, FS 90 R out of the reach of fuel properly in a well ventilated area. N Release the rope slowly so that it must locate firmly in a dry and secure... the Machine For periods of the rope off the rotor. 249BA016 KN N Fit the starter cover on the rope rotor to the cylinder fins and air filter. N Hold the rotor steady.
... of the arrow. If the grip droops to rotate the rotor another half turn on the housing. N Dispose of children and other unauthorized persons. 42 FS 90, FS 90 R out of the reach of fuel properly in a well ventilated area. N Release the rope slowly so that it must locate firmly in a dry and secure... the Machine For periods of the rope off the rotor. 249BA016 KN N Fit the starter cover on the rope rotor to the cylinder fins and air filter. N Hold the rotor steady.
Product Instruction Manual
Page 46
...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 Complete machine visual inspection (condition, leaks) clean X X X 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 servicing ...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 and adjust if necessary, one time after every 150 hours of operation, by a specialist...
...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 Complete machine visual inspection (condition, leaks) clean X X X 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 servicing ...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 and adjust if necessary, one time after every 150 hours of operation, by a specialist...
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
... the harness. 12 Fuel Pump Provides additional fuel feed 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... engine exhaust noise and diverts exhaust gases away from operator. English 2 1 3 45 1 3 6 4 1 Mowing Head 2 Deflector for all Mowing Attachments 5 Skirt 6 Metal Mowing Tool 002BA114 KN FS 90, FS 90 R 47
... the harness. 12 Fuel Pump Provides additional fuel feed 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... engine exhaust noise and diverts exhaust gases away from operator. English 2 1 3 45 1 3 6 4 1 Mowing Head 2 Deflector for all Mowing Attachments 5 Skirt 6 Metal Mowing Tool 002BA114 KN FS 90, FS 90 R 47
Product Instruction Manual
Page 53
... repairs on the application of a warranted part still under warranty. STIHL Incorporated is defective. Choke (Cold Start Enrichment System) - Maintenance Requirements The maintenance instructions in writing by the failure of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). FS 90, FS 90 R 51 Air Filter - the effect of "repair or replace as necessary" will be...
... repairs on the application of a warranted part still under warranty. STIHL Incorporated is defective. Choke (Cold Start Enrichment System) - Maintenance Requirements The maintenance instructions in writing by the failure of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). FS 90, FS 90 R 51 Air Filter - the effect of "repair or replace as necessary" will be...
Product Instruction Manual
Page 54
...that you including diagnosis, parts and labor. Defects Warranty Period The warranty periods will begin on or modified part. 52 FS 90, FS 90 R STIHL Incorporated will not be liable to warrant failures of warranted parts caused by the use of any emissions-related part on ... to applicable emission regulations for two years in materials and workmanship which cause the engine to fail to conform 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...
...that you including diagnosis, parts and labor. Defects Warranty Period The warranty periods will begin on or modified part. 52 FS 90, FS 90 R STIHL Incorporated will not be liable to warrant failures of warranted parts caused by the use of any emissions-related part on ... to applicable emission regulations for two years in materials and workmanship which cause the engine to fail to conform 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
...maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for FS 90, FS 90 R that is liable for Warranty Service Bring the STIHL product to service the subject engines. 6. The warranty on emission-related parts and must be repaired or... warranty must be warranted for the remaining warranty period. 3. STIHL Incorporated is not scheduled for replacement as required maintenance in the written instructions required by the failure of the part. Emission Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System),...
...maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for FS 90, FS 90 R that is liable for Warranty Service Bring the STIHL product to service the subject engines. 6. The warranty on emission-related parts and must be repaired or... warranty must be warranted for the remaining warranty period. 3. STIHL Incorporated is not scheduled for replacement as required maintenance in the written instructions required by the failure of the part. Emission Warranty Parts List Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System),...