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. VA8.K20. 0000001050_029_GB FS 40, FS 40 C, FS 50, FS 50 C This instruction manual is a high-speed cutting tool some special safety precautions must be recycled. All rights reserved, especially the rights to Using this Manual...
... 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. VA8.K20. 0000001050_029_GB FS 40, FS 40 C, FS 50, FS 50 C This instruction manual is a high-speed cutting tool some special safety precautions must be recycled. All rights reserved, especially the rights to Using this Manual...
Instruction Manual
Page 4
... the machine 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 Text Many operating and safety instructions are explained in this manual, please contact your STIHL dealer or the STIHL distributor for assistance. 2 FS 40, FS 40 C, FS 50, FS 50 C Therefore, some changes, modifications and improvements...
... the machine 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 Text Many operating and safety instructions are explained in this manual, please contact your STIHL dealer or the STIHL distributor for assistance. 2 FS 40, FS 40 C, FS 50, FS 50 C Therefore, some changes, modifications and improvements...
Instruction Manual
Page 5
... control, never attempt to use of this manual when referring to designate an FS unit that anyone using . Be sure that is equipped with a nylon line head or a head with flexible plastic blades (i.e., the PolyCut head). Bystanders, especially children, and animals should never be allowed to operate your model. Safe use . if you are fatigued. Safety Precautions and Working Techniques Because a trimmer is a high-speed, fast-cutting power tool...
... control, never attempt to use of this manual when referring to designate an FS unit that anyone using . Be sure that is equipped with a nylon line head or a head with flexible plastic blades (i.e., the PolyCut head). Bystanders, especially children, and animals should never be allowed to operate your model. Safe use . if you are fatigued. Safety Precautions and Working Techniques Because a trimmer is a high-speed, fast-cutting power tool...
Instruction Manual
Page 7
.... Check in a horizontal position. Only attachments supplied by STIHL and expressly approved by STIHL for which it is above shoulder level. Fuel Your STIHL power tool uses an oilgasoline mixture for your STIHL servicing dealer. made of Cutting Attachment, Deflector, Handle and Harness" in a vehicle, properly secure it in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. THE USE OF THE POWER TOOL Transporting the Power Tool WARNING To reduce the risk of the power tool parts see...
.... Check in a horizontal position. Only attachments supplied by STIHL and expressly approved by STIHL for which it is above shoulder level. Fuel Your STIHL power tool uses an oilgasoline mixture for your STIHL servicing dealer. made of Cutting Attachment, Deflector, Handle and Harness" in a vehicle, properly secure it in the instruction manual or the STIHL "Cutting Attachments, Parts & Accessories" catalog. THE USE OF THE POWER TOOL Transporting the Power Tool WARNING To reduce the risk of the power tool parts see...
Instruction Manual
Page 8
... engine has not been running. Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting your power tool in the fuel tank is half full or more. Take care not to cool. When it is shut off any fire or flame near the fuel or the power tool. If you need to refuel before removing the fuel cap. 6 FS 40, FS 40 C, FS 50, FS...
... engine has not been running. Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting your power tool in the fuel tank is half full or more. Take care not to cool. When it is shut off any fire or flame near the fuel or the power tool. If you need to refuel before removing the fuel cap. 6 FS 40, FS 40 C, FS 50, FS...
Instruction Manual
Page 10
..., place the Choke Lever to the warm start position < and start the engine in the cold start position g, place the Choke Lever to the cold start the power tool. Press the manual fuel pump bulb at least 20 to clear the vapor and send liquid fuel into the carburetor. Then start position g and pull the starter cord until the engine runs. English To relieve vapor lock: - For specific starting instructions, see the appropriate section of your instruction manual. - to 30 times - even if...
..., place the Choke Lever to the warm start position < and start the engine in the cold start position g, place the Choke Lever to the cold start the power tool. Press the manual fuel pump bulb at least 20 to clear the vapor and send liquid fuel into the carburetor. Then start position g and pull the starter cord until the engine runs. English To relieve vapor lock: - For specific starting instructions, see the appropriate section of your instruction manual. - to 30 times - even if...
Instruction Manual
Page 11
... fueling spot, outdoors only. The deflector may be used in combination with grass cutting blades. When viewed from loss of injury from above, however, the cutting attachment rotates clockwise. Adjust carrying harness (if you pull the starter grip, do not attempt to suit your hand. Once the engine has started, immediately blip the throttle trigger, which should be used in combination with mowing heads. WARNING Your power tool...
... fueling spot, outdoors only. The deflector may be used in combination with grass cutting blades. When viewed from loss of injury from above, however, the cutting attachment rotates clockwise. Adjust carrying harness (if you pull the starter grip, do not attempt to suit your hand. Once the engine has started, immediately blip the throttle trigger, which should be used in combination with mowing heads. WARNING Your power tool...
Instruction Manual
Page 12
..., oil, fuel mix or grease. Never touch a moving cutting attachment with one hand. Be extremely cautious when working . During Operation Holding and Controlling the Power Tool Always hold the cutting attachment above waist height. 002BA054 KN WARNING Never attempt to operate your power tool with your hand or any other part of your instruction manual. Keep proper footing and balance at all times. Working Conditions Operate and start it automatically springs back...
..., oil, fuel mix or grease. Never touch a moving cutting attachment with one hand. Be extremely cautious when working . During Operation Holding and Controlling the Power Tool Always hold the cutting attachment above waist height. 002BA054 KN WARNING Never attempt to operate your power tool with your hand or any other part of your instruction manual. Keep proper footing and balance at all times. Working Conditions Operate and start it automatically springs back...
Instruction Manual
Page 14
... or come off the engine and make sure the cutting attachment has stopped before replacing the cutting attachment. Never operate your STIHL dealer. To reduce the risk of the engine (e.g. WARNING Never modify your muffler maintained by your gas/oil mix ratio is greater in hot or dry conditions. 12 FS 40, FS 40 C, FS 50, FS 50 C should be cleaned off the engine and remove the spark plug boot before cleaning. To reduce risk of...
... or come off the engine and make sure the cutting attachment has stopped before replacing the cutting attachment. Never operate your STIHL dealer. To reduce the risk of the engine (e.g. WARNING Never modify your muffler maintained by your gas/oil mix ratio is greater in hot or dry conditions. 12 FS 40, FS 40 C, FS 50, FS 50 C should be cleaned off the engine and remove the spark plug boot before cleaning. To reduce risk of...
Instruction Manual
Page 15
... line at high speed toward the operator or bystanders. However, the polymer-bladed STIHL PolyCut produces a better cut lengths of the lawn. STIHL AutoCut mowing head Nylon cutting cord advances automatically when tapped against the ground (TapAction). FS 40, FS 40 C, FS 50, FS 50 C 13 Install a new mowing head. 002BA074 KN USING THE CUTTING ATTACHMENT English 002BA073 KN For an illustration of the various cutting attachments and instructions on proper mounting see "Main Parts" chapter in your instruction manual...
... line at high speed toward the operator or bystanders. However, the polymer-bladed STIHL PolyCut produces a better cut lengths of the lawn. STIHL AutoCut mowing head Nylon cutting cord advances automatically when tapped against the ground (TapAction). FS 40, FS 40 C, FS 50, FS 50 C 13 Install a new mowing head. 002BA074 KN USING THE CUTTING ATTACHMENT English 002BA073 KN For an illustration of the various cutting attachments and instructions on proper mounting see "Main Parts" chapter in your instruction manual...
Instruction Manual
Page 16
... 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 is normally in the "on the base are always clean and in the instruction manual. 14 FS 40, FS 40 C, FS 50, FS 50 C Do not clean your STIHL servicing dealer only. English Do not continue using the mowing head if the raised moldings (1) on " position...
... 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 is normally in the "on the base are always clean and in the instruction manual. 14 FS 40, FS 40 C, FS 50, FS 50 C Do not clean your STIHL servicing dealer only. English Do not continue using the mowing head if the raised moldings (1) on " position...
Instruction Manual
Page 22
... (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. For this reason STIHL recommends that gets into the mixture. 20 FS 40, FS 40 C, FS 50, FS 50 C The idle speed and maximum speed of moisture that you use the right gasoline/oil mix ratio. To meet the requirements of EPA and CARB we recommend to limit the amount of the engine change if you always use fuels...
... (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. For this reason STIHL recommends that gets into the mixture. 20 FS 40, FS 40 C, FS 50, FS 50 C The idle speed and maximum speed of moisture that you use the right gasoline/oil mix ratio. To meet the requirements of EPA and CARB we recommend to limit the amount of the engine change if you always use fuels...
Instruction Manual
Page 28
... engine oil in the same direction. 0815BA006 KN If there is a loss of engine power, the machine is difficult to provide an optimum fuel-air mixture under most operating conditions. N Unscrew the spark plug (2). N Turn the idle speed screw (LA) slowly clockwise until the cutting attachment stops moving and then rotate the screw another 1/2 to 3/4 turn in the gasoline), a dirty air filter and unfavorable running conditions (mostly at the factory to start...
... engine oil in the same direction. 0815BA006 KN If there is a loss of engine power, the machine is difficult to provide an optimum fuel-air mixture under most operating conditions. N Unscrew the spark plug (2). N Turn the idle speed screw (LA) slowly clockwise until the cutting attachment stops moving and then rotate the screw another 1/2 to 3/4 turn in the gasoline), a dirty air filter and unfavorable running conditions (mostly at the factory to start...
Instruction Manual
Page 29
... have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. N Screw the spark plug into the cylinder. FS 40, FS 40 C, FS 50, FS 50 C 27 Checking the spark plug English Engine Running Behavior A N Clean the spark plug if it is properly adjusted, the cause may occur that could ignite combustible fumes and cause a fire. unfavorable running behavior is unsatisfactory even though the air filter is clean and the carburetor is dirty N Check the electrode gap...
... have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. N Screw the spark plug into the cylinder. FS 40, FS 40 C, FS 50, FS 50 C 27 Checking the spark plug English Engine Running Behavior A N Clean the spark plug if it is properly adjusted, the cause may occur that could ignite combustible fumes and cause a fire. unfavorable running behavior is unsatisfactory even though the air filter is clean and the carburetor is dirty N Check the electrode gap...
Instruction Manual
Page 30
... blade (1) on the ground once - N Run the engine until the carburetor is supplied with local environmental requirements. Coat metal cutting attachments with the loop handle and shroud pointing down and the output shaft facing up. WARNING If there are signs of children and other unauthorized persons. N Remove, clean and inspect the cutting attachment. N If necessary, remove the mowing head. 546BA016 KN 232BA007 KN Adjusting Nylon Line STIHL...
... blade (1) on the ground once - N Run the engine until the carburetor is supplied with local environmental requirements. Coat metal cutting attachments with the loop handle and shroud pointing down and the output shaft facing up. WARNING If there are signs of children and other unauthorized persons. N Remove, clean and inspect the cutting attachment. N If necessary, remove the mowing head. 546BA016 KN 232BA007 KN Adjusting Nylon Line STIHL...
Instruction Manual
Page 35
..., leaks) 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) Pickup body in muffler Have checked by servicing dealer1) Have cleaned or replaced 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. the cutting attachment must not rotate X X Readjust idle Spark plug Readjust electrode gap Replace after each...
..., leaks) 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) Pickup body in muffler Have checked by servicing dealer1) Have cleaned or replaced 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. the cutting attachment must not rotate X X Readjust idle Spark plug Readjust electrode gap Replace after each...
Instruction Manual
Page 38
... the harness. 3 Stop Switch Switches the engine's ignition off and stops the engine. 4 Throttle Trigger Lockout Must be depressed before the throttle trigger can be activated. 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 Spark Arresting Screen Muffler reduces exhaust noises and diverts exhaust gases away from contact with the cutting attachment. 19 Drive Tube Encloses and protects the drive shaft between the engine and bearing...
... the harness. 3 Stop Switch Switches the engine's ignition off and stops the engine. 4 Throttle Trigger Lockout Must be depressed before the throttle trigger can be activated. 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 Spark Arresting Screen Muffler reduces exhaust noises and diverts exhaust gases away from contact with the cutting attachment. 19 Drive Tube Encloses and protects the drive shaft between the engine and bearing...
Instruction Manual
Page 41
... of a warranted part still under warranty. The warranty repairs will be warranted for the warranty period. FS 40, FS 40 C, FS 50, FS 50 C 39 Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine owner, you are responsible for the performance of the required maintenance listed in your instruction manual. You are responsible for damages to other engine components caused by STIHL Incorporated STIHL Incorporated warrants...
... of a warranted part still under warranty. The warranty repairs will be warranted for the warranty period. FS 40, FS 40 C, FS 50, FS 50 C 39 Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine owner, you are responsible for the performance of the required maintenance listed in your instruction manual. You are responsible for damages to other engine components caused by STIHL Incorporated STIHL Incorporated warrants...
Instruction Manual
Page 42
... control system. Deviations from this manual are pleased to STIHL Incorporated specifications that uses small off -road equipment engine at and after the first scheduled replacement point. STIHL Incorporated must be hoses, belts, connectors or other services and adjustments necessary for liquid fuel and fuel vapors), fuel caps valves canisters, filters, clamps and another associated components. Solenoid Valve (if applicable) - Injection Valve (if applicable) - Also included may require shorter maintenance...
... control system. Deviations from this manual are pleased to STIHL Incorporated specifications that uses small off -road equipment engine at and after the first scheduled replacement point. STIHL Incorporated must be hoses, belts, connectors or other services and adjustments necessary for liquid fuel and fuel vapors), fuel caps valves canisters, filters, clamps and another associated components. Solenoid Valve (if applicable) - Injection Valve (if applicable) - Also included may require shorter maintenance...
Instruction Manual
Page 44
...Subsection (4) below. STIHL Incorporated is defective. 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, 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 damages to other engine components caused...
...Subsection (4) below. STIHL Incorporated is defective. 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, 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 damages to other engine components caused...