Instruction Manual
Page 2
... your blower differs from time-to continually improve all of personal injury. BA_SE_003_004_01_11.fm Contents Guide to Using this Manual 2 Safety Precautions 3 Assembling the Blower 12 Fuel 14 Fueling 15 Information Before You Start .......... 16 Starting / Stopping the Engine 16 Operating Instructions 19 Cleaning the Air Filter 19 Motor Management 20 Adjusting the Carburetor 20 Catalytic Converter 22 Checking the Spark Plug 22 Spark Arresting Screen in Brazil Printed on page 3, before using your blower. © ANDREAS STIHL...
... your blower differs from time-to continually improve all of personal injury. BA_SE_003_004_01_11.fm Contents Guide to Using this Manual 2 Safety Precautions 3 Assembling the Blower 12 Fuel 14 Fueling 15 Information Before You Start .......... 16 Starting / Stopping the Engine 16 Operating Instructions 19 Cleaning the Air Filter 19 Motor Management 20 Adjusting the Carburetor 20 Catalytic Converter 22 Checking the Spark Plug 22 Spark Arresting Screen in Brazil Printed on page 3, before using your blower. © ANDREAS STIHL...
Instruction Manual
Page 3
... use of an accident or personal injury or serious damage to the environment. Such components may not be available as special accessories from your machine differ from time to several models with an asterisk (*). Example: Loosen the screw (1) Lever (2) ... Therefore some changes, modifications and improvements may be covered in order to avoid damage to property. The operating and handling instructions...
... use of an accident or personal injury or serious damage to the environment. Such components may not be available as special accessories from your machine differ from time to several models with an asterisk (*). Example: Loosen the screw (1) Lever (2) ... Therefore some changes, modifications and improvements may be covered in order to avoid damage to property. The operating and handling instructions...
Instruction Manual
Page 6
... on "Parts and Controls"! !Warning! Adjust carrying harness to the pack frame. If the buffers are torn or damaged, they should have their use with adequate top and side protection which connect the engine to suit your STIHL dealer. Although certain unauthorized attachment are authorized. Never operate a blower unless wearing goggles or properly fitted safety glasses with the specific STIHL blower models are...
... on "Parts and Controls"! !Warning! Adjust carrying harness to the pack frame. If the buffers are torn or damaged, they should have their use with adequate top and side protection which connect the engine to suit your STIHL dealer. Although certain unauthorized attachment are authorized. Never operate a blower unless wearing goggles or properly fitted safety glasses with the specific STIHL blower models are...
Instruction Manual
Page 7
.... Use extreme caution when handling gasoline or fuel mix. Relieve fuel tank pressure by hand as securely as possible. 6 BR 420 Always tighten fuel filler cap securely after fueling. Never remove fuel filler cap while engine is fixed and spilled fuel has been wiped away. To reduce the risk of fuel spillage and fire from the fueling spot before refueling. If fuel or oil leakage is found, do not start or run the engine...
.... Use extreme caution when handling gasoline or fuel mix. Relieve fuel tank pressure by hand as securely as possible. 6 BR 420 Always tighten fuel filler cap securely after fueling. Never remove fuel filler cap while engine is fixed and spilled fuel has been wiped away. To reduce the risk of fuel spillage and fire from the fueling spot before refueling. If fuel or oil leakage is found, do not start or run the engine...
Instruction Manual
Page 8
... objects or from thrown parts, check your machine if it . Place the machine on your owner`s manual. if boot is a one-person machine. Your blower is loose, sparks may be needed in the area of fanwheel and fan housing. Never operate your fanwheel and fan housing for repair. : Throttle trigger must move freely and spring back to idle position when released. : Stop switch must move easily to...
... objects or from thrown parts, check your machine if it . Place the machine on your owner`s manual. if boot is a one-person machine. Your blower is loose, sparks may be needed in the area of fanwheel and fan housing. Never operate your fanwheel and fan housing for repair. : Throttle trigger must move freely and spring back to idle position when released. : Stop switch must move easily to...
Instruction Manual
Page 9
... observed. !Warning! Have your muffler serviced and repaired by your muffler. Some STIHL blower models are hot. !Warning! Since a muffler with a damaged or improperly mounted cylinder housing or a damaged/ deformed muffler shell. To reduce the risk of the engine by a STIHL servicing dealer. 8 BR 420 Due to reduce the risk of fire from the emission of the cylinder, spark plug) become hot during operation and remain hot for...
... observed. !Warning! Have your muffler serviced and repaired by your muffler. Some STIHL blower models are hot. !Warning! Since a muffler with a damaged or improperly mounted cylinder housing or a damaged/ deformed muffler shell. To reduce the risk of the engine by a STIHL servicing dealer. 8 BR 420 Due to reduce the risk of fire from the emission of the cylinder, spark plug) become hot during operation and remain hot for...
Instruction Manual
Page 10
... times before cleaning or servicing the unit or replacing parts. 353BA039 KN !Warning! Keep your back using the machine in trenches or other confined areas. Wrap your thumb and forefinger. Your blower produces poisonous exhaust fumes as soon as it on the ground when operating at great speed. !Warning! The blower fan between your fingers tightly around the handle, keeping the control handle...
... times before cleaning or servicing the unit or replacing parts. 353BA039 KN !Warning! Keep your back using the machine in trenches or other confined areas. Wrap your thumb and forefinger. Your blower produces poisonous exhaust fumes as soon as it on the ground when operating at great speed. !Warning! The blower fan between your fingers tightly around the handle, keeping the control handle...
Instruction Manual
Page 12
... (e.g. Follow the maintenance and repair instructions in hot weather. Never touch a hot muffler or burn will result. !Warning! Remember that the fan is in good condition. Use the spark arresting muffler supplied with a feeler gauge at your owner's manual. BR 420 11 Use of the emission control devices and systems may deny warranty. Fit a new spark plug if the electrodes are always in good condition. Use only identical STIHL replacement parts for...
... (e.g. Follow the maintenance and repair instructions in hot weather. Never touch a hot muffler or burn will result. !Warning! Remember that the fan is in good condition. Use the spark arresting muffler supplied with a feeler gauge at your owner's manual. BR 420 11 Use of the emission control devices and systems may deny warranty. Fit a new spark plug if the electrodes are always in good condition. Use only identical STIHL replacement parts for...
Instruction Manual
Page 15
... cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). The machine's fuel tank and the canister in which fuel mix is lower, use in air cooled two-cycle engines. This, in order to tighten the harness. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 14 BR 420 Do not fill fuel canisters that...
... cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). The machine's fuel tank and the canister in which fuel mix is lower, use in air cooled two-cycle engines. This, in order to tighten the harness. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 14 BR 420 Do not fill fuel canisters that...
Instruction Manual
Page 16
... shake it to release slowly. BR 420 15 After fueling, tighten fuel cap as securely as to ensure proper mixing of the oil with the fuel. Fueling English / USA Fuel mix ages Only mix sufficient fuel for a long period, drain and clean the fuel tank and run engine until carburetor is dry. Always thoroughly shake the mixture in approved fuel-canisters only. Gasoline Oil (STIHL 50:1 or equivalent high-quality oils) US gal. 1 2 1/2 5 US fl.oz...
... shake it to release slowly. BR 420 15 After fueling, tighten fuel cap as securely as to ensure proper mixing of the oil with the fuel. Fueling English / USA Fuel mix ages Only mix sufficient fuel for a long period, drain and clean the fuel tank and run engine until carburetor is dry. Always thoroughly shake the mixture in approved fuel-canisters only. Gasoline Oil (STIHL 50:1 or equivalent high-quality oils) US gal. 1 2 1/2 5 US fl.oz...
Instruction Manual
Page 20
... high loads during this period. After finishing work Wait for the first three tank fillings. BR 420 19 if it is dirty or damaged, fit a new one. : Always install a new prefilter when you change the main filter. : Take the prefilter (4) out of the filter cover. : If the prefilter is a noticeable loss of engine power : Turn choke knob to g : Release the screws (1) and pull off load) for engine to run at idle speed...
... high loads during this period. After finishing work Wait for the first three tank fillings. BR 420 19 if it is dirty or damaged, fit a new one. : Always install a new prefilter when you change the main filter. : Take the prefilter (4) out of the filter cover. : If the prefilter is a noticeable loss of engine power : Turn choke knob to g : Release the screws (1) and pull off load) for engine to run at idle speed...
Instruction Manual
Page 21
... fundamental engine parameters and components (e.g. The carburetor comes from the filter cover and filter chamber. : Install the main filter and prefilter elements in the filter cover. : Fit the cover on the filter base (5) and tighten it is only possible to correct the adjustment of the high speed and low speed screws within fine limits. 20 BR 420 This setting provides an optimum fuel-air mixture under most operating conditions. Exhaust emissions are controlled by...
... fundamental engine parameters and components (e.g. The carburetor comes from the filter cover and filter chamber. : Install the main filter and prefilter elements in the filter cover. : Fit the cover on the filter base (5) and tighten it is only possible to correct the adjustment of the high speed and low speed screws within fine limits. 20 BR 420 This setting provides an optimum fuel-air mixture under most operating conditions. Exhaust emissions are controlled by...
Instruction Manual
Page 22
... : High speed screw (H) is now open 1/4 turn Low speed screw (L) is now open 1/4 turn : Start and warm up the engine. : Turn the high speed screw (H) clockwise (leaner) - until the engine runs and accelerates smoothly. Erratic idling behavior, engine stalls even after every correction to the low speed screw (L). : Shut off the engine. : Check the air filter and clean or replace if necessary. : Check the spark arresting screen (if fitted) in the muffler and clean or replace if necessary. : Carefuly turn both adjusting screws counterclockwise...
... : High speed screw (H) is now open 1/4 turn Low speed screw (L) is now open 1/4 turn : Start and warm up the engine. : Turn the high speed screw (H) clockwise (leaner) - until the engine runs and accelerates smoothly. Erratic idling behavior, engine stalls even after every correction to the low speed screw (L). : Shut off the engine. : Check the air filter and clean or replace if necessary. : Check the spark arresting screen (if fitted) in the muffler and clean or replace if necessary. : Carefuly turn both adjusting screws counterclockwise...
Instruction Manual
Page 23
... air filter and unfavorable running conditions, e.g. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are essential to Using this Manual" 22 BR 420 English / USA Catalytic Converter* Checking the Spark Plug Units with unleaded gasoline and STIHL two cycle engine oil or equivalent quality two cycle engine oils in a mix ratio of 50:1 (see "Guide to minimize harmful exhaust emissions and ensure a long catalyst service life. Correct adjustment of the carburetor...
... air filter and unfavorable running conditions, e.g. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are essential to Using this Manual" 22 BR 420 English / USA Catalytic Converter* Checking the Spark Plug Units with unleaded gasoline and STIHL two cycle engine oil or equivalent quality two cycle engine oils in a mix ratio of 50:1 (see "Guide to minimize harmful exhaust emissions and ensure a long catalyst service life. Correct adjustment of the carburetor...
Instruction Manual
Page 24
... the starter cover (2) off the engine. Spark Arresting Screen in Muffler English / USA Replacing Starter Rope and Rewind Spring 1 1 2 12 1 1 000BA036 TR 373BA031 KN 373BA025 KN To reduce the risk of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the muffler. If the engine is damaged or heavily carbonized, fit a new one. BR 420...
... the starter cover (2) off the engine. Spark Arresting Screen in Muffler English / USA Replacing Starter Rope and Rewind Spring 1 1 2 12 1 1 000BA036 TR 373BA031 KN 373BA025 KN To reduce the risk of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the muffler. If the engine is damaged or heavily carbonized, fit a new one. BR 420...
Instruction Manual
Page 28
... time is longer than normal or operating conditions are difficult (very dusty work be done by servicing dealer1) Check x x Clean Replace x x x x 1) STIHL recommends that this work area etc.), shorten the specified intervals accordingly. Complete machine Control handle Air filter Pick up body in fuel tank Fuel tank Carburetor Spark plug Cooling air intakes Spark arresting screen in muffler All accessible screws and nuts (not adjusting screws) Anti-vibration elements Blower air intake screen Safety label Visual inspection (conditon, leaks) x x Clean x Check operation...
... time is longer than normal or operating conditions are difficult (very dusty work be done by servicing dealer1) Check x x Clean Replace x x x x 1) STIHL recommends that this work area etc.), shorten the specified intervals accordingly. Complete machine Control handle Air filter Pick up body in fuel tank Fuel tank Carburetor Spark plug Cooling air intakes Spark arresting screen in muffler All accessible screws and nuts (not adjusting screws) Anti-vibration elements Blower air intake screen Safety label Visual inspection (conditon, leaks) x x Clean x Check operation...
Instruction Manual
Page 29
...* 2 Nozzle, curved* 3 Blower tube* 4 Blower tube 5 Control handle 6 Throttle trigger 7 Setting lever 8 Stop switch 9 Pleated hose 10 Harness 11 Back plate 12 Back padding 13 Air filter 373BA040 KN 14 Antivibration elements 15 Spark plug boot 16 Muffler (with spark arresting 15 screen)* 17 Carburetor adjusting screws 14 18 17 # 16 18 Choke knob 19 Starter grip 19 20 20 Fuel filler cap 21 Fuel tank # Serial number 14 21 373BA041 KN 373BA042 KN * see "Guide to Using this Manual" 28 BR 420
...* 2 Nozzle, curved* 3 Blower tube* 4 Blower tube 5 Control handle 6 Throttle trigger 7 Setting lever 8 Stop switch 9 Pleated hose 10 Harness 11 Back plate 12 Back padding 13 Air filter 373BA040 KN 14 Antivibration elements 15 Spark plug boot 16 Muffler (with spark arresting 15 screen)* 17 Carburetor adjusting screws 14 18 17 # 16 18 Choke knob 19 Starter grip 19 20 20 Fuel filler cap 21 Fuel tank # Serial number 14 21 373BA041 KN 373BA042 KN * see "Guide to Using this Manual" 28 BR 420
Instruction Manual
Page 30
Blower Tube. Throttle Trigger. Stop Switch. Harness. For carrying the unit. 11. Air Filter Housing. Spark Plug Boot. Muffler (with spark arresting screen). The grip of the pull starter, which is designed to reduce the risk of the user. 12. For fuel and oil mixture. BR 420 29 Blower Tube. Control Handle. Controls the speed of vibrations created by enriching mixture. 19. Sets the trottle to the ignition wire. 16. Back Padding. For tuning carburetor. 18. Eases engine starting by the engine to hold...
Blower Tube. Throttle Trigger. Stop Switch. Harness. For carrying the unit. 11. Air Filter Housing. Spark Plug Boot. Muffler (with spark arresting screen). The grip of the pull starter, which is designed to reduce the risk of the user. 12. For fuel and oil mixture. BR 420 29 Blower Tube. Control Handle. Controls the speed of vibrations created by enriching mixture. 19. Sets the trottle to the ignition wire. 16. Back Padding. For tuning carburetor. 18. Eases engine starting by the engine to hold...
Instruction Manual
Page 33
... contact a STIHL customer service representative at no abuse, neglect or improper maintenance of the required maintenance listed in your small off -road engines must be completed in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of two years. 32 BR 420 Coverage by STIHL Incorporated free of all applicable regulations. Your emission control system includes parts such as a problem exists. English / USA STIHL Incorporated...
... contact a STIHL customer service representative at no abuse, neglect or improper maintenance of the required maintenance listed in your small off -road engines must be completed in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of two years. 32 BR 420 Coverage by STIHL Incorporated free of all applicable regulations. Your emission control system includes parts such as a problem exists. English / USA STIHL Incorporated...
Instruction Manual
Page 34
... to the owner. STIHL Incorporated is liable for damages to any warranty maintenance or repairs on emissionrelated parts and must be performed at an authorized STIHL servicing dealer. These warranted parts are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). Limitations This Emission Control Systems Warranty shall not cover any independent test laboratory. The California Air Resources Board's Emission Warranty Parts List specifically defines the...
... to the owner. STIHL Incorporated is liable for damages to any warranty maintenance or repairs on emissionrelated parts and must be performed at an authorized STIHL servicing dealer. These warranted parts are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel"). Limitations This Emission Control Systems Warranty shall not cover any independent test laboratory. The California Air Resources Board's Emission Warranty Parts List specifically defines the...
