Instruction Manual
Page 2
... 23 Replacing Starter Rope and Rewind Spring 23 Storing the Machine 26 Maintenance Chart 27 Parts and Controls 28 Specifications 30 Special Accessories 31 Maintenance and Repairs 31 STIHL Incorporated Federal and California Emission Control Warranty Statement 32 Trademarks 34 STIHl BR 420 English / USA Allow only persons who understand this Manual. !Warning! Contact your...
... 23 Replacing Starter Rope and Rewind Spring 23 Storing the Machine 26 Maintenance Chart 27 Parts and Controls 28 Specifications 30 Special Accessories 31 Maintenance and Repairs 31 STIHL Incorporated Federal and California Emission Control Warranty Statement 32 Trademarks 34 STIHl BR 420 English / USA Allow only persons who understand this Manual. !Warning! Contact your...
Instruction Manual
Page 4
... before operating this manual. !Warning! To reduce the risk of the machine may have higher vibration levels. !Warning! Observe all STIHL blowers. Never let the unit run unattended. the blower 3. Working with your blower. Careless or improper use of serious or fatal...area where a machine is recommended for a description of the controls and function of the parts of a blower involves 1. Your STIHL blower is important that might impair vision, dexterity or judgment. BR 420 3 It is equipped with some pacemakers. Reread the owner`s manual and the safety instructions...
... before operating this manual. !Warning! To reduce the risk of the machine may have higher vibration levels. !Warning! Observe all STIHL blowers. Never let the unit run unattended. the blower 3. Working with your blower. Careless or improper use of serious or fatal...area where a machine is recommended for a description of the controls and function of the parts of a blower involves 1. Your STIHL blower is important that might impair vision, dexterity or judgment. BR 420 3 It is equipped with some pacemakers. Reread the owner`s manual and the safety instructions...
Instruction Manual
Page 6
... or more buffers may cause the engine or fuel tank to hit or rub against other parts, and may lead to help protect your STIHL dealer. Blower noise may be replaced by STIHL for use may damage your owner`s manual). THE BLOWER For illustrations and definitions of your ... STIHL blower models are useable for fuel (see the chapter on "Fuel" of the blower parts see the chapter on "Parts and Controls"! !Warning! Never operate a blower unless wearing goggles or properly fitted safety glasses with adequate top and side protection which connect the engine to the pack frame. BR 420 ...
... or more buffers may cause the engine or fuel tank to hit or rub against other parts, and may lead to help protect your STIHL dealer. Blower noise may be replaced by STIHL for use may damage your owner`s manual). THE BLOWER For illustrations and definitions of your ... STIHL blower models are useable for fuel (see the chapter on "Fuel" of the blower parts see the chapter on "Parts and Controls"! !Warning! Never operate a blower unless wearing goggles or properly fitted safety glasses with adequate top and side protection which connect the engine to the pack frame. BR 420 ...
Instruction Manual
Page 8
... Failure to follow this brief period, and your assistant should always inspect your unit before starting . BR 420 7 English / USA Before Starting !Warning! If any damage is loose, sparks may damage the starter...$ : Tightness of eye or other solid surface in the area of your hand. Never operate your STIHL dealer for damage (cracks, nicks, chipping). if boot is found, stop using the unit and contact...to hand or fingers and may occur and ignite fuel vapor! : Condition of injury from thrown parts, check your back after starting it is a one-person machine. Do not allow the grip...
... Failure to follow this brief period, and your assistant should always inspect your unit before starting . BR 420 7 English / USA Before Starting !Warning! If any damage is loose, sparks may damage the starter...$ : Tightness of eye or other solid surface in the area of your hand. Never operate your STIHL dealer for damage (cracks, nicks, chipping). if boot is found, stop using the unit and contact...to hand or fingers and may occur and ignite fuel vapor! : Condition of injury from thrown parts, check your back after starting it is a one-person machine. Do not allow the grip...
Instruction Manual
Page 9
... spark plug) become hot during operation and remain hot for a while after use. !Warning! The muffler could be observed. !Warning! Some STIHL blower models are hot. !Warning! Since a muffler with a catalytic converter, which is designed to idle or is shut off. Due to the...do not touch the muffler and other parts while they are equipped with a catalytic converter cools down less rapidly than conventional mufflers, always set your backpack blower down before refueling your muffler serviced and repaired by a STIHL servicing dealer. 8 BR 420 To reduce the risk of the engine ...
... spark plug) become hot during operation and remain hot for a while after use. !Warning! The muffler could be observed. !Warning! Some STIHL blower models are hot. !Warning! Since a muffler with a catalytic converter, which is designed to idle or is shut off. Due to the...do not touch the muffler and other parts while they are equipped with a catalytic converter cools down less rapidly than conventional mufflers, always set your backpack blower down before refueling your muffler serviced and repaired by a STIHL servicing dealer. 8 BR 420 To reduce the risk of the engine ...
Instruction Manual
Page 10
... the carrying harness. The blower fan between your machine under good visibility and daylight conditions only. !Warning! Do not throw off the machine quickly. BR 420 9 When working in order to have your thumb and forefinger. To reduce the risk of the wind, i.e., do not work against the wind.... toxic fumes, never start or run the blower indoors or in good condition and free of times before cleaning or servicing the unit or replacing parts. 353BA039 KN !Warning! Keep the space behind and beside the engine clear at high speed, because small objects such as it . English /...
... the carrying harness. The blower fan between your machine under good visibility and daylight conditions only. !Warning! Do not throw off the machine quickly. BR 420 9 When working in order to have your thumb and forefinger. To reduce the risk of the wind, i.e., do not work against the wind.... toxic fumes, never start or run the blower indoors or in good condition and free of times before cleaning or servicing the unit or replacing parts. 353BA039 KN !Warning! Keep the space behind and beside the engine clear at high speed, because small objects such as it . English /...
Instruction Manual
Page 12
... 50 operating hours and reset if necessary. For any part of hearing. BR 420 11 Check fuel filler cap for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may cause loss of the muffler or spark arrestor. ...Use only identical STIHL replacement parts for longer than a few days, always empty the ...
... 50 operating hours and reset if necessary. For any part of hearing. BR 420 11 Check fuel filler cap for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may cause loss of the muffler or spark arrestor. ...Use only identical STIHL replacement parts for longer than a few days, always empty the ...
Instruction Manual
Page 20
if it - BR 420 19 Drain the fuel tank. Store the machine in period A factory new machine should not be dissipated by flow of cooling air. then knock it - ... avoids unnecessary high loads during the break-in the engine are greater during the break-in period, the frictional resistances in period. As all moving parts have to run at high revs (full throttle off the filter cover (2). 373BA017 KN 373BA018 KN 43 5 : Remove the main filter (3) from thermal overload. During...
if it - BR 420 19 Drain the fuel tank. Store the machine in period A factory new machine should not be dissipated by flow of cooling air. then knock it - ... avoids unnecessary high loads during the break-in the engine are greater during the break-in period, the frictional resistances in period. As all moving parts have to run at high revs (full throttle off the filter cover (2). 373BA017 KN 373BA018 KN 43 5 : Remove the main filter (3) from thermal overload. During...
Instruction Manual
Page 23
...operating hours or earlier if the electrodes are essential to Using this Manual" 22 BR 420 Wrong fuel mix (too much oil in fuel mix. : Dirty air filter. : Unfavorable running conditions (mostly at part throttle etc.) affect the condition of 50:1 (see "Starting / Stopping the Engine...". : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary - Rectify problems which may only be operated with unleaded gasoline and STIHL two cycle engine oil or...
...operating hours or earlier if the electrodes are essential to Using this Manual" 22 BR 420 Wrong fuel mix (too much oil in fuel mix. : Dirty air filter. : Unfavorable running conditions (mostly at part throttle etc.) affect the condition of 50:1 (see "Starting / Stopping the Engine...". : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary - Rectify problems which may only be operated with unleaded gasoline and STIHL two cycle engine oil or...
Instruction Manual
Page 26
... KN 353BA029 KN : Fit the pawl (5) in the counterclockwise direction - the spring clip must face downward. Go to "Tensioning rewind spring". : Fit new spring housing - BR 420 25 bottom plate must point clockwise - Engage outer spring loop over the peg on the pawl - start outside and work inward. see illustration. If the... rewind spring : Lubricate the new spring with a few drops of non-resinous oil. : Remove the rope rotor as described in "Replacing the starter rope". : Remove parts of old spring.
... KN 353BA029 KN : Fit the pawl (5) in the counterclockwise direction - the spring clip must face downward. Go to "Tensioning rewind spring". : Fit new spring housing - BR 420 25 bottom plate must point clockwise - Engage outer spring loop over the peg on the pawl - start outside and work inward. see illustration. If the... rewind spring : Lubricate the new spring with a few drops of non-resinous oil. : Remove the rope rotor as described in "Replacing the starter rope". : Remove parts of old spring.
Instruction Manual
Page 29
English / USA Parts and Controls 7 1 8 6 10 5 4 11 13 2 3 9 12 1 Nozzle, straight* 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 ... 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
English / USA Parts and Controls 7 1 8 6 10 5 4 11 13 2 3 9 12 1 Nozzle, straight* 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 ... 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 32
Warranty claims following repairs can be available for your STIHL dealer for information regarding special accessories that may appear alone on small parts. This symbol may be identified by the STlHL part number, the STIHl logo and, in this manual. Special Accessories Maintenance ...cases, by the STlHL parts symbol (. Original STlHL parts can be performed only by an authorized STIHL servicing dealer using original STIHL replacement parts. Other repair work may be accepted only if the repair has been performed by authorized STIHL service shops. English / USA BR 420 31
Warranty claims following repairs can be available for your STIHL dealer for information regarding special accessories that may appear alone on small parts. This symbol may be identified by the STlHL part number, the STIHl logo and, in this manual. Special Accessories Maintenance ...cases, by the STlHL parts symbol (. Original STlHL parts can be performed only by an authorized STIHL servicing dealer using original STIHL replacement parts. Other repair work may be accepted only if the repair has been performed by authorized STIHL service shops. English / USA BR 420 31
Instruction Manual
Page 33
...for presenting your engine is equivalent in performance and durability may be designed, built and equipped, at an authorized dealer), parts, and labor. The equipment engine must be designed, built and equipped to conform with U.S. Your emission control system includes... other states, 1997 and later model year small off -road equipment engines are responsible for the period of two years. 32 BR 420 English / USA STIHL Incorporated Federal and California Emission Control Warranty Statement Your Warranty Rights and Obligations The U.S. In California, new small off-road engines ...
...for presenting your engine is equivalent in performance and durability may be designed, built and equipped, at an authorized dealer), parts, and labor. The equipment engine must be designed, built and equipped to conform with U.S. Your emission control system includes... other states, 1997 and later model year small off -road equipment engines are responsible for the period of two years. 32 BR 420 English / USA STIHL Incorporated Federal and California Emission Control Warranty Statement Your Warranty Rights and Obligations The U.S. In California, new small off-road engines ...
Instruction Manual
Page 34
... only for the period of required maintenance, : repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that a warranted part is purchased by the initial purchaser and you have signed and sent back the warranty card to STIHL. BR 420 33 Deviations from this manual are : Carburetor Choke (Cold start enrichment system) Intake manifold...
... only for the period of required maintenance, : repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that a warranted part is purchased by the initial purchaser and you have signed and sent back the warranty card to STIHL. BR 420 33 Deviations from this manual are : Carburetor Choke (Cold start enrichment system) Intake manifold...