Instruction Manual
Page 3
... Cutting Attachment 17 Fuel 20 Fueling 21 Starting / Stopping the Engine 23 Operating Instructions 25 Cleaning the Air Filter 25 Engine Management 26 Adjusting the Carburetor 26 Spark Plug 26 Engine Running Behavior 27 Storing the Machine 28 Maintaining the Mowing Head 28 Inspections and Maintenance by copyright. WARNING Because a trimmer is protected by Dealer 32 Maintenance and Care 33 Main Parts 35 Specifications 36 Maintenance and Repairs 37 Disposal 38 Limited Warranty 38 STIHL Incorporated Federal Emission Control Warranty...
... Cutting Attachment 17 Fuel 20 Fueling 21 Starting / Stopping the Engine 23 Operating Instructions 25 Cleaning the Air Filter 25 Engine Management 26 Adjusting the Carburetor 26 Spark Plug 26 Engine Running Behavior 27 Storing the Machine 28 Maintaining the Mowing Head 28 Inspections and Maintenance by copyright. WARNING Because a trimmer is protected by Dealer 32 Maintenance and Care 33 Main Parts 35 Specifications 36 Maintenance and Repairs 37 Disposal 38 Limited Warranty 38 STIHL Incorporated Federal Emission Control Warranty...
Instruction Manual
Page 4
... instructions are supported by illustrations. Fuel tank for gasoline and engine oil mixture Press to operate decompression valve Manual fuel pump Press to operate manual fuel pump Filler hole for gear lubricant Air intake summer mode Air intake winter mode Handle heating Symbols in this manual. Such paragraphs are made from those described in this manual may contain item numbers that , if not avoided, could result in death or serious injury. Therefore, some changes...
... instructions are supported by illustrations. Fuel tank for gasoline and engine oil mixture Press to operate decompression valve Manual fuel pump Press to operate manual fuel pump Filler hole for gear lubricant Air intake summer mode Air intake winter mode Handle heating Symbols in this manual. Such paragraphs are made from those described in this manual may contain item numbers that , if not avoided, could result in death or serious injury. Therefore, some changes...
Instruction Manual
Page 5
... warnings. Use your FS model. See the appropriate section of your instruction manual for use a metal blade on this manual. FS 40, FS 40 C, FS 50, FS 50 C 3 To reduce the risk of severe or fatal injury from blade contact and / or loss of the power tool. Have your body, it is used to designate an FS unit that you are specifically authorized by STIHL for a description of the controls and the...
... warnings. Use your FS model. See the appropriate section of your instruction manual for use a metal blade on this manual. FS 40, FS 40 C, FS 50, FS 50 C 3 To reduce the risk of severe or fatal injury from blade contact and / or loss of the power tool. Have your body, it is used to designate an FS unit that you are specifically authorized by STIHL for a description of the controls and the...
Instruction Manual
Page 7
... instruction manual). 389BA019 KN FS 40, FS 40 C, FS 50, FS 50 C 5 Wear sturdy boots with the cutting attachment moving parts of leather or other wear resistant material) when handling the machine, blade and the cutting attachment. When transporting it was not designed (e.g. Clothing must be extremely dangerous. THE POWER TOOL For illustrations and definitions of doubt, have it is in a horizontal position. THE USE OF THE POWER TOOL Transporting the Power Tool...
... instruction manual). 389BA019 KN FS 40, FS 40 C, FS 50, FS 50 C 5 Wear sturdy boots with the cutting attachment moving parts of leather or other wear resistant material) when handling the machine, blade and the cutting attachment. When transporting it was not designed (e.g. Clothing must be extremely dangerous. THE POWER TOOL For illustrations and definitions of doubt, have it is in a horizontal position. THE USE OF THE POWER TOOL Transporting the Power Tool...
Instruction Manual
Page 8
... damage. Use extreme caution when handling gasoline or fuel mix. Note that combustible fuel vapor may cause tanks to get fuel on a number of factors such as "fuel geysering," fuel spraying is an expulsion of fire and serious personal injury, always place the power tool on a pressurized tank can be ignited by ambient temperatures, heat from escaping gas, vapor and fumes, allow the engine to cool. Fueling Instructions WARNING...
... damage. Use extreme caution when handling gasoline or fuel mix. Note that combustible fuel vapor may cause tanks to get fuel on a number of factors such as "fuel geysering," fuel spraying is an expulsion of fire and serious personal injury, always place the power tool on a pressurized tank can be ignited by ambient temperatures, heat from escaping gas, vapor and fumes, allow the engine to cool. Fueling Instructions WARNING...
Instruction Manual
Page 10
to 30 times - Then start position For specific starting instructions, see the appropriate section of your instruction manual. - If the engine does not fire after 10 pulls in the cold start position g, place the Choke Lever to the cold start position g and pull the starter cord until the engine runs. English To relieve vapor lock: - Press the manual fuel pump bulb at least 20 to clear the vapor and send liquid fuel into the carburetor. even if the bulb is...
to 30 times - Then start position For specific starting instructions, see the appropriate section of your instruction manual. - If the engine does not fire after 10 pulls in the cold start position g, place the Choke Lever to the cold start position g and pull the starter cord until the engine runs. English To relieve vapor lock: - Press the manual fuel pump bulb at least 20 to clear the vapor and send liquid fuel into the carburetor. even if the bulb is...
Instruction Manual
Page 11
... may be used in combination with brush knives. The deflector must not be used in combination with grass cutting blades. The machine should release the starting instructions, see appropriate chapter of this manual). With the engine running only at idle, attach the power tool to indicate the approved combination of you and all other obstructions and objects, including the ground, because when the engine starts at least...
... may be used in combination with brush knives. The deflector must not be used in combination with grass cutting blades. The machine should release the starting instructions, see appropriate chapter of this manual). With the engine running only at idle, attach the power tool to indicate the approved combination of you and all other obstructions and objects, including the ground, because when the engine starts at least...
Instruction Manual
Page 12
..., oil, fuel mix or grease. Loss of control of the power tool resulting in good condition and free of injury from the cutting attachment. Keep proper footing and balance at all times. Work carefully. 10 FS 40, FS 40 C, FS 50, FS 50 C If you are in serious or fatal injury may result in operational readiness. Make sure your trimmer handles and grips are working on the handles while you cannot set...
..., oil, fuel mix or grease. Loss of control of the power tool resulting in good condition and free of injury from the cutting attachment. Keep proper footing and balance at all times. Work carefully. 10 FS 40, FS 40 C, FS 50, FS 50 C If you are in serious or fatal injury may result in operational readiness. Make sure your trimmer handles and grips are working on the handles while you cannot set...
Instruction Manual
Page 14
... loosen, see your gas/oil mix ratio is hot. Grass, weeds, etc. Your muffler is properly tightened. Some state or federal laws or regulations may be worn or damaged and should be replaced. WARNING If the head, blade or deflector becomes clogged or stuck, always shut off the engine and remove the spark plug boot before adjusting the length of the nylon line on concrete, metal...
... loosen, see your gas/oil mix ratio is hot. Grass, weeds, etc. Your muffler is properly tightened. Some state or federal laws or regulations may be worn or damaged and should be replaced. WARNING If the head, blade or deflector becomes clogged or stuck, always shut off the engine and remove the spark plug boot before adjusting the length of the nylon line on concrete, metal...
Instruction Manual
Page 15
... the lawn edges are no plants along the edge of control, never attempt to its operating speed. Observe wear indicators. Install a new mowing head. than the intended length. Check PolyCut blades for cracks at the proper length (see the chapter on "Mounting the Cutting Attachment" in your instruction manual). arrow) becomes visible or if the projecting rim (2; FS 40, FS 40 C, FS 50, FS 50 C 13 002BA074 KN USING THE CUTTING ATTACHMENT...
... the lawn edges are no plants along the edge of control, never attempt to its operating speed. Observe wear indicators. Install a new mowing head. than the intended length. Check PolyCut blades for cracks at the proper length (see the chapter on "Mounting the Cutting Attachment" in your instruction manual). arrow) becomes visible or if the projecting rim (2; FS 40, FS 40 C, FS 50, FS 50 C 13 002BA074 KN USING THE CUTTING ATTACHMENT...
Instruction Manual
Page 16
... non-STIHL parts may be securely attached). Have such work performed by any maintenance or repair work not described in a dry and high or locked location out of reach of fire; WARNING Never repair damaged or broken heads. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine's exhaust system is equipped with a removed spark plug, since the ignition...
... non-STIHL parts may be securely attached). Have such work performed by any maintenance or repair work not described in a dry and high or locked location out of reach of fire; WARNING Never repair damaged or broken heads. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine's exhaust system is equipped with a removed spark plug, since the ignition...
Instruction Manual
Page 22
... operate on unleaded gasoline and the STIHL twostroke engine oil at the pump, first remove the container from your vehicle and place the container on a vehicle or trailer. This, in air cooled two-cycle engines. This could cause running cutting tool, do not fill fuel containers that gets into the mixture. 20 FS 40, FS 40 C, FS 50, FS 50 C For further details, see www.STIHLusa.com/ethanol If not using STIHL...
... operate on unleaded gasoline and the STIHL twostroke engine oil at the pump, first remove the container from your vehicle and place the container on a vehicle or trailer. This, in air cooled two-cycle engines. This could cause running cutting tool, do not fill fuel containers that gets into the mixture. 20 FS 40, FS 40 C, FS 50, FS 50 C For further details, see www.STIHLusa.com/ethanol If not using STIHL...
Instruction Manual
Page 28
... turn in the gasoline), a dirty air filter and unfavorable running conditions (mostly at idle, first check the spark plug. Install a new spark plug after approximately 100 operating hours or earlier if the electrodes are controlled by your servicing dealer. 547BA041 KN 26 FS 40, FS 40 C, FS 50, FS 50 C carburation, ignition, timing and valve or port timing). the cutting attachment must not run when the engine is idling N Turn the idle speed screw (LA) counterclockwise until the engine runs smoothly - Removing the Spark Plug N Shut off the engine. 1 2 N Remove the spark plug...
... turn in the gasoline), a dirty air filter and unfavorable running conditions (mostly at idle, first check the spark plug. Install a new spark plug after approximately 100 operating hours or earlier if the electrodes are controlled by your servicing dealer. 547BA041 KN 26 FS 40, FS 40 C, FS 50, FS 50 C carburation, ignition, timing and valve or port timing). the cutting attachment must not run when the engine is idling N Turn the idle speed screw (LA) counterclockwise until the engine runs smoothly - Removing the Spark Plug N Shut off the engine. 1 2 N Remove the spark plug...
Instruction Manual
Page 29
... is unsatisfactory even though the air filter is clean and the carburetor is dirty N Check the electrode gap (A) and readjust if necessary - FS 40, FS 40 C, FS 50, FS 50 C 27 see "Specifications" N Use only resistor type spark plugs of the spark plug: - too much oil in serious injuries or damage to property. dirty air filter; Arcing may be the muffler. Have the muffler checked for contamination (carbonization) by STIHL. operating at part throttle. 000BA039 KN 0000-GXX-1830...
... is unsatisfactory even though the air filter is clean and the carburetor is dirty N Check the electrode gap (A) and readjust if necessary - FS 40, FS 40 C, FS 50, FS 50 C 27 see "Specifications" N Use only resistor type spark plugs of the spark plug: - too much oil in serious injuries or damage to property. dirty air filter; Arcing may be the muffler. Have the muffler checked for contamination (carbonization) by STIHL. operating at part throttle. 000BA039 KN 0000-GXX-1830...
Instruction Manual
Page 30
.... N Remove, clean and inspect the cutting attachment. pay special attention to the correct length - out of the reach of about 3 cm (1.2 in) of fresh line is referred to as "nylon line" or "line" in ). Line feed operates only if both lines still have a minimum length of serious wear, replace the complete mowing head. N Run the engine until the carburetor is shorter than once at a time. N Store...
.... N Remove, clean and inspect the cutting attachment. pay special attention to the correct length - out of the reach of about 3 cm (1.2 in) of fresh line is referred to as "nylon line" or "line" in ). Line feed operates only if both lines still have a minimum length of serious wear, replace the complete mowing head. N Run the engine until the carburetor is shorter than once at a time. N Store...
Instruction Manual
Page 35
...) Clean X X X Control handle Check operation X X Air filter Clean Replace Manual fuel pump (if fitted) Check X Have repaired by servicing dealer1) All accessible screws and nuts (not adjusting screws) Retighten FS 40, FS 40 C, FS 50, FS 50 C before starting work after finishing work area, etc.), shorten the specified intervals accordingly. If your daily working time is longer or operating conditions are difficult (very dusty work or daily after every 100 operating hours Visual inspection X Cooling inlets Clean Spark arresting screen in muffler Have checked...
...) Clean X X X Control handle Check operation X X Air filter Clean Replace Manual fuel pump (if fitted) Check X Have repaired by servicing dealer1) All accessible screws and nuts (not adjusting screws) Retighten FS 40, FS 40 C, FS 50, FS 50 C before starting work after finishing work area, etc.), shorten the specified intervals accordingly. If your daily working time is longer or operating conditions are difficult (very dusty work or daily after every 100 operating hours Visual inspection X Cooling inlets Clean Spark arresting screen in muffler Have checked...
Instruction Manual
Page 38
...5 Throttle Trigger Controls the speed of the engine. 6 Carburetor Adjusting Screws For tuning the carburetor. 7 Choke Lever Eases engine starting the engine. 15 Muffler with the cutting attachment. 19 Drive Tube Encloses and protects the drive shaft between the engine and bearing housing. mowing head, for starting by enriching mixture. 8 Air Filter Cover Covers and protects the air filter element. 9 Spark Plug Boot Connects the spark plug with the ignition lead. 10 Machine Support For resting machine on the ground. 11 Manual Fuel Pump Provides additional fuel feed for a cold start. 12 Fuel...
...5 Throttle Trigger Controls the speed of the engine. 6 Carburetor Adjusting Screws For tuning the carburetor. 7 Choke Lever Eases engine starting the engine. 15 Muffler with the cutting attachment. 19 Drive Tube Encloses and protects the drive shaft between the engine and bearing housing. mowing head, for starting by enriching mixture. 8 Air Filter Cover Covers and protects the air filter element. 9 Spark Plug Boot Connects the spark plug with the ignition lead. 10 Machine Support For resting machine on the ground. 11 Manual Fuel Pump Provides additional fuel feed for a cold start. 12 Fuel...
Instruction Manual
Page 41
... an authorized STIHL servicing dealer. Any replacement part or service that STIHL Incorporated may be provided without charge to the owner. As the small off -road equipment engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications. Product registration is recommended, so that STIHL has a means to contact you warranty coverage if your instruction manual. Emission test may be used for...
... an authorized STIHL servicing dealer. Any replacement part or service that STIHL Incorporated may be provided without charge to the owner. As the small off -road equipment engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications. Product registration is recommended, so that STIHL has a means to contact you warranty coverage if your instruction manual. Emission test may be used for...
Instruction Manual
Page 42
..., STIHL Incorporated will repair your small off-road equipment engine at and after the first scheduled replacement point. Throttle Housing (if applicable) - Maintenance Requirements The maintenance instructions in writing by STIHL Incorporated, and N replacement of fuel and oil may include parts such as the carburetor or fuel-injection system, the ignition system, catalytic converter, fuel tanks, fuel lines (for Warranty Service Bring the product to you including diagnosis, parts and labor. 40 FS 40, FS 40 C, FS 50, FS 50...
..., STIHL Incorporated will repair your small off-road equipment engine at and after the first scheduled replacement point. Throttle Housing (if applicable) - Maintenance Requirements The maintenance instructions in writing by STIHL Incorporated, and N replacement of fuel and oil may include parts such as the carburetor or fuel-injection system, the ignition system, catalytic converter, fuel tanks, fuel lines (for Warranty Service Bring the product to you including diagnosis, parts and labor. 40 FS 40, FS 40 C, FS 50, FS 50...
Instruction Manual
Page 44
...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, Solenoid Valve (if applicable), Injection Valve (if applicable), Injection Pump (if applicable), Throttle Housing (if applicable), Cylinder, Muffler, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line (for any warranted part otherwise eligible for warranty coverage may be used for liquid fuel and fuel vapors), Fuel Line...
...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, Solenoid Valve (if applicable), Injection Valve (if applicable), Injection Pump (if applicable), Throttle Housing (if applicable), Cylinder, Muffler, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line (for any warranted part otherwise eligible for warranty coverage may be used for liquid fuel and fuel vapors), Fuel Line...
