Product Instruction Manual
Page 3
... your STIHL dealer or the STIHL distributor for the type of the instructions in Muffler 23 Spark Plug 23 Lubricating the Gearbox 24 Replacing the Starter Rope and Rewind Spring 25 Storing the Machine 27 Replacing the Depth Wheel 27 Replacing the Skirt 28 Replacing the Cutting Blade 28 Maintenance and Care 29 Main Parts 31 Specifications 32 Special Accessories 33 Maintenance and Repairs 34 STIHL Incorporated Federal Emission Control Warranty Statement 34 { FC 90 English Allow...
... your STIHL dealer or the STIHL distributor for the type of the instructions in Muffler 23 Spark Plug 23 Lubricating the Gearbox 24 Replacing the Starter Rope and Rewind Spring 25 Storing the Machine 27 Replacing the Depth Wheel 27 Replacing the Skirt 28 Replacing the Cutting Blade 28 Maintenance and Care 29 Main Parts 31 Specifications 32 Special Accessories 33 Maintenance and Repairs 34 STIHL Incorporated Federal Emission Control Warranty Statement 34 { FC 90 English Allow...
Product Instruction Manual
Page 4
Fuel tank for gasoline and engine oil mixture Press to time. As a result, engineering changes and improvements are supported by illustrations. Air intake winter mode Handle heating Caution! Indicates an imminent risk of severe or fatal injury. A description of a step or procedure that refers directly to the operating instructions, this manual may contain paragraphs that appear in Text Many operating and safety instructions are made from those...
Fuel tank for gasoline and engine oil mixture Press to time. As a result, engineering changes and improvements are supported by illustrations. Air intake winter mode Handle heating Caution! Indicates an imminent risk of severe or fatal injury. A description of a step or procedure that refers directly to the operating instructions, this manual may contain paragraphs that appear in Text Many operating and safety instructions are made from those...
Product Instruction Manual
Page 7
... body and the cutting attachment behind you. If spilled and ignited by your power tool carefully so as to 5 Use extreme caution when handling gasoline or fuel mix. Fueling Instructions Warning! To reduce the risk of serious injury from burns, never attempt to reduce the risk of control and blade contact, never carry or transport your power tool in a horizontal position. Warning! Gasoline vapor pressure may be...
... body and the cutting attachment behind you. If spilled and ignited by your power tool carefully so as to 5 Use extreme caution when handling gasoline or fuel mix. Fueling Instructions Warning! To reduce the risk of serious injury from burns, never attempt to reduce the risk of control and blade contact, never carry or transport your power tool in a horizontal position. Warning! Gasoline vapor pressure may be...
Product Instruction Manual
Page 8
... and take it will go (approx. 1/4 turn) - immediately stop use of the cap until it is running. English allow any pressure build-up in the tank to your authorized STIHL dealer for repair. 001BA226 KN 6 FC 90 Different models may be damaged or broken; Toolless cap with the top of the cap may be equipped with this happens, change your clothing. Next, twist the...
... and take it will go (approx. 1/4 turn) - immediately stop use of the cap until it is running. English allow any pressure build-up in the tank to your authorized STIHL dealer for repair. 001BA226 KN 6 FC 90 Different models may be damaged or broken; Toolless cap with the top of the cap may be equipped with this happens, change your clothing. Next, twist the...
Product Instruction Manual
Page 9
... the operator or bystanders. Unit vibrations can cause an improperly tightened fuel filler cap to use a power tool that cuttings and other solid surface in operation. For specific starting , particularly the throttle trigger, throttle trigger lockout, stop switch, cutting blade, deflector and harness. Replace damaged blades before starting instructions, see chapter "Working Techniques".) Adjust carrying harness and hand grip to modify the controls or safety devices. it is equipped with the proper deflector, handle...
... the operator or bystanders. Unit vibrations can cause an improperly tightened fuel filler cap to use a power tool that cuttings and other solid surface in operation. For specific starting , particularly the throttle trigger, throttle trigger lockout, stop switch, cutting blade, deflector and harness. Replace damaged blades before starting instructions, see chapter "Working Techniques".) Adjust carrying harness and hand grip to modify the controls or safety devices. it is equipped with the proper deflector, handle...
Product Instruction Manual
Page 10
... proper adjustments and repairs. Warning! To reduce the risk of control, do not use your hand. When you cannot set the correct idle speed, have your STIHL dealer check your power tool with the running only at starting . To reduce the risk of personal injury from loss of injury from blade contact, be fast enough for the clutch to "drop start" your body. 002BA054 KN 8 FC 90 Never...
... proper adjustments and repairs. Warning! To reduce the risk of control, do not use your hand. When you cannot set the correct idle speed, have your STIHL dealer check your power tool with the running only at starting . To reduce the risk of personal injury from loss of injury from blade contact, be fast enough for the clutch to "drop start" your body. 002BA054 KN 8 FC 90 Never...
Product Instruction Manual
Page 12
...! Grass, weeds, etc. Warning! The gearbox becomes hot during operation and remain hot for cracks, wear and damage. The muffler and other parts while they are hot. fins of the cylinder, spark plug) become hot during operation. Warning! Let the engine cool down sitting on "Replacing the Cutting Blade" in serious or fatal injury. Never modify your STIHL servicing dealer only. Have your muffler serviced and repaired...
...! Grass, weeds, etc. Warning! The gearbox becomes hot during operation and remain hot for cracks, wear and damage. The muffler and other parts while they are hot. fins of the cylinder, spark plug) become hot during operation. Warning! Let the engine cool down sitting on "Replacing the Cutting Blade" in serious or fatal injury. Never modify your STIHL servicing dealer only. Have your muffler serviced and repaired...
Product Instruction Manual
Page 13
... repair damaged cutting attachments by any maintenance or repair work or cleaning the power tool. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use a metal blade on blades. Do not clean your machine with a spark-arresting screen to reduce the risk of fire, never operate your STIHL servicing dealer only. Before storing for maintenance and repair. Warning! Strictly follow the maintenance and repair instructions in the boot may create arcing that could ignite combustible...
... repair damaged cutting attachments by any maintenance or repair work or cleaning the power tool. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use a metal blade on blades. Do not clean your machine with a spark-arresting screen to reduce the risk of fire, never operate your STIHL servicing dealer only. Before storing for maintenance and repair. Warning! Strictly follow the maintenance and repair instructions in the boot may create arcing that could ignite combustible...
Product Instruction Manual
Page 18
... locations. 16 FC 90 Use mid-grade unleaded gasoline with a lower octane rating may increase engine temperatures. The chemical composition of up to the engine. Gasoline with an ethanol content of the fuel is lower, use premium unleaded fuel. Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that you use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Fuel mix...
... locations. 16 FC 90 Use mid-grade unleaded gasoline with a lower octane rating may increase engine temperatures. The chemical composition of up to the engine. Gasoline with an ethanol content of the fuel is lower, use premium unleaded fuel. Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that you use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Fuel mix...
Product Instruction Manual
Page 22
... five times - N Turn the choke knob to STOP-0. N Set the slide control, lockout lever and throttle trigger to idle speed. The slide control moves to run position (F) - For longer out-ofservice perionds - Empty the fuel tank and keep the machine in a dry place, well away from thermal overload. N Start the engine by the flow of cooling air. see "Spark Plug". even if the engine is cold. Operating Instructions During break-in period A factory-new machine...
... five times - N Turn the choke knob to STOP-0. N Set the slide control, lockout lever and throttle trigger to idle speed. The slide control moves to run position (F) - For longer out-ofservice perionds - Empty the fuel tank and keep the machine in a dry place, well away from thermal overload. N Start the engine by the flow of cooling air. see "Spark Plug". even if the engine is cold. Operating Instructions During break-in period A factory-new machine...
Product Instruction Manual
Page 23
..., ignition, timing and valve or port timing) without the addition of the fundamental engine parameters and components (e.g. N Insert the screw and tighten it . Standard Setting N Shut off the engine. N Install the filter element in the filter housing (4) and remove it down firmly. Cleaning the Air Filter Engine Management English Adjusting the Carburetor If there is a noticeable loss of engine power 4 1 2 N Turn the choke knob to adjust the high speed and low speed screws within fine limits. N Check that the throttle cable is...
..., ignition, timing and valve or port timing) without the addition of the fundamental engine parameters and components (e.g. N Insert the screw and tighten it . Standard Setting N Shut off the engine. N Install the filter element in the filter housing (4) and remove it down firmly. Cleaning the Air Filter Engine Management English Adjusting the Carburetor If there is a noticeable loss of engine power 4 1 2 N Turn the choke knob to adjust the high speed and low speed screws within fine limits. N Check that the throttle cable is...
Product Instruction Manual
Page 24
... idling, have your machine checked and repaired by your servicing dealer. English N Carefully turn open . - The low speed screw (L) is usually necessary to the low speed screw (L). N Open the throttle wide. At high altitude N Turn the high speed screw (H) clockwise (leaner), no further noticeable increase in the same direction. Readjust idle It is 3/4 turn both adjusting screws counterclockwise as far as stop , until the engine runs and accelerates smoothly. 22 FC 90 the cutting blade...
... idling, have your machine checked and repaired by your servicing dealer. English N Carefully turn open . - The low speed screw (L) is usually necessary to the low speed screw (L). N Open the throttle wide. At high altitude N Turn the high speed screw (H) clockwise (leaner), no further noticeable increase in the same direction. Readjust idle It is 3/4 turn both adjusting screws counterclockwise as far as stop , until the engine runs and accelerates smoothly. 22 FC 90 the cutting blade...
Product Instruction Manual
Page 29
... wingnut replaced by a servicing dealer. 241BA024 KN FC 90 27 Storing the Machine For periods of the thread on the housing. this helps prevent the carburetor diaphragms sticking together. Depth wheel 1 2 N The end of 3 months or longer N Drain and clean the fuel tank in accordance with local environmental requirements. If the parts are then reassembled, the captive function is dry - N Fit the starter cover...
... wingnut replaced by a servicing dealer. 241BA024 KN FC 90 27 Storing the Machine For periods of the thread on the housing. this helps prevent the carburetor diaphragms sticking together. Depth wheel 1 2 N The end of 3 months or longer N Drain and clean the fuel tank in accordance with local environmental requirements. If the parts are then reassembled, the captive function is dry - N Fit the starter cover...
Product Instruction Manual
Page 31
...) Clean X X X Control handle Check operation X X Air filter Pickup body in muffler Clean or replace All accessible screws and nuts (not adjusting screws) Retighten Anti-vibration elements (rubber buffers, Check X springs) Have replaced by dealer1) Fuel tank Clean Carburetor Check idle adjustment - Maintenance and Care The following intervals apply to normal operating conditions only. the blade must not turn X X Readjust idle Spark plug Readjust electrode gap Replace after every 100 operating hours Visual inspection X Cooling inlets Clean Valve clearance Check...
...) Clean X X X Control handle Check operation X X Air filter Pickup body in muffler Clean or replace All accessible screws and nuts (not adjusting screws) Retighten Anti-vibration elements (rubber buffers, Check X springs) Have replaced by dealer1) Fuel tank Clean Carburetor Check idle adjustment - Maintenance and Care The following intervals apply to normal operating conditions only. the blade must not turn X X Readjust idle Spark plug Readjust electrode gap Replace after every 100 operating hours Visual inspection X Cooling inlets Clean Valve clearance Check...
Product Instruction Manual
Page 34
... toward the operator by enriching mixture. 6. Fuel Tank For fuel and oil mixture. 9. Specifications EPA / CEPA The Emission Compliance Period referred to meet Federal emission requirements. Loop Handle For easy control of cut . 18. Fuel Pump Provides additional fuel feed for cutting weeds and soft green plants. 16. Air Filter Cover Covers and protects the air filter element. 8. Spark Plug Boot Connects the spark plug with the cutting attachment. 17. Depth Wheel Deflector-mounted depth wheel rolls on the CARB-Air Index...
... toward the operator by enriching mixture. 6. Fuel Tank For fuel and oil mixture. 9. Specifications EPA / CEPA The Emission Compliance Period referred to meet Federal emission requirements. Loop Handle For easy control of cut . 18. Fuel Pump Provides additional fuel feed for cutting weeds and soft green plants. 16. Air Filter Cover Covers and protects the air filter element. 8. Spark Plug Boot Connects the spark plug with the cutting attachment. 17. Depth Wheel Deflector-mounted depth wheel rolls on the CARB-Air Index...
Product Instruction Manual
Page 36
..., to conform with U.S. English Maintenance and Repairs Users of this manual. Where a warrantable condition exists, STIHL Incorporated will be repaired or replaced by authorized STIHL service shops. As the small off -road equipment engine. STIHL Incorporated Federal Emission Control Warranty Statement Not for small non road engines. EPA standards for two years. Any replacement part or service that is performed at the time of engine use from defects in your...
..., to conform with U.S. English Maintenance and Repairs Users of this manual. Where a warrantable condition exists, STIHL Incorporated will be repaired or replaced by authorized STIHL service shops. As the small off -road equipment engine. STIHL Incorporated Federal Emission Control Warranty Statement Not for small non road engines. EPA standards for two years. Any replacement part or service that is performed at the time of engine use from defects in your...
Product Instruction Manual
Page 37
... for the warranty period. Carburetor - Magneto or Electronic Ignition System (Ignition Module) - FC 90 35 If any independent test laboratory. Diagnosis You, as required maintenance, or which is scheduled for that a warranted part is determined that part. Emission test may be replaced by the initial purchaser and you have any authorized STIHL servicing dealer and present the signed warranty card. Intake Manifold - Spark Plug - Fuel Line - Box...
... for the warranty period. Carburetor - Magneto or Electronic Ignition System (Ignition Module) - FC 90 35 If any independent test laboratory. Diagnosis You, as required maintenance, or which is scheduled for that a warranted part is determined that part. Emission test may be replaced by the initial purchaser and you have any authorized STIHL servicing dealer and present the signed warranty card. Intake Manifold - Spark Plug - Fuel Line - Box...
Product Instruction Manual
Page 38
... for presenting your small off-road equipment engine 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 Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners. Your emissions control system may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect...
... for presenting your small off-road equipment engine 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 Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners. Your emissions control system may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect...
Product Instruction Manual
Page 39
... replacement as required maintenance in the written instructions required in the Emission Warranty Parts List (see below ) must be provided without charge to the owner. Add-on or modified part. The use of a non exempted add-on or modified parts that is liable for the warranty period defined in such written instructions to the owner. 5. A statement in Subsection COVERAGE BY STIHL INCORPORATED, see above , warranty services...
... replacement as required maintenance in the written instructions required in the Emission Warranty Parts List (see below ) must be provided without charge to the owner. Add-on or modified part. The use of a non exempted add-on or modified parts that is liable for the warranty period defined in such written instructions to the owner. 5. A statement in Subsection COVERAGE BY STIHL INCORPORATED, see above , warranty services...
Product Instruction Manual
Page 40
... BOSS® 38 Some of a warranted part still under warranty. Emission 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 other engine components caused by the failure of STIHL's Common Law Trademarks BioPlus™ Easy2Start™...
... BOSS® 38 Some of a warranted part still under warranty. Emission 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 other engine components caused by the failure of STIHL's Common Law Trademarks BioPlus™ Easy2Start™...