Page 1
STIHL BR 45
Instruction Manual
Owner's Manual
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Contents
english / USA
Guide to Using this Manual .............. 2
Safety Precautions ........................... 3
Assembling the Blower ................... 10
Fitting Backpack ............................. 13
Fuel ................................................ 14
Fueling ............................................ 15
Starting / Stopping
the Engine ...................................... 15
Operating Instructions .................... 18
Printing inks contain vegetable oils;
paper can be recycled.
Using the Blower ............................ 19
Cleaning the Air Filter ..................... 20
Motor Management ........................ 20
Adjusting the Carburetor ................ 21
Catalytic Converter* ........................ 22
Checking the Spark Plug ................ 22
Engine Running Behavior ............... 23
Rewind Starter ................................ 24
Storing the Machine ........................ 24
Maintenance Chart ......................... 25
Main Parts and Controls ................. 26
Specifications ................................. 28
Maintenance and Repairs ............... 28
STIHL Incorporated Federal and
California Emission Control
Printed on chlorine-free paper.© 2002 Andreas Stihl AG & Co., Waiblingen
Warranty Statement ........................ 29
Allow only persons who understand this
Manual to operate your blower.
To receive maximum performance and
satisfaction from your STIHL blower, it is
important that you read and understand
the maintenance and safety precautions,
starting on page 3, before using your
blower.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
Manual.
!Warning!
Because a blower is a high-speed tool,
some special safety precautions must
be observed as with any other power
tool to reduce the risk of personal injury.
Careless or improper use may cause
serious or even fatal injury.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time-to-time. If the
operating characteristics or the
appearance of your blower differs from
those described in this Manual, please
contact your STIHL dealer for
informations and assistance.
* see “Guide to Using this Manual”
STIHl
0458 374 8621. M2,5. G2. PM. Printed in USA
1BR 45
Page 3
english / USA
Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
: Step or procedure without direct
reference to an illustration.
Description of step or procedure that
refers directly to the illustration and
contains item numbers that appear in
the illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Warning where there is a risk of
damaging the machine or individual
components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s understanding of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual refers to
several models with different
features. Components that are not
installed in all models and related
applications are marked thus
Such components are available as
special accessories from your
STIHL dealer.
*.
Engineering improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore, we cannot be responsible for
changes, modifications or
improvements not covered in this
manual.
2
BR 45
Page 4
Safety Precautions
english / USA
Warning!
The use of any blower
may be dangerous. It is
important that you read,
fully understand and
observe the following safety
precautions.
!Warning!
Reread the owner`s
manual and the safety
instructions peri-
odically.
!Warning!
Careless or improper use of the machine
may cause serious injury. Have your
STIHL Dealer show you how to operate
your blower. Observe all applicable
local safety regulations, standards and
ordinances.
!Warning!
Minors should never be allowed to use a
blower. Bystanders, especially children,
and animals should not be allowed in the
area where a machine is in use.
Never let the unit run unattended. Do not
lend or rent your machine without the
owner`s manual.
Be sure that anyone using your unit
understands the information contained
in this manual.
Most of these safety precautions and
warnings apply to the use of all STIHL
blowers. Different models may have
different parts and controls.
See the appropriate section of your
owner`s manual for a description of the
controls and function of the parts of your
machine.
Safe use of a blower involves
1. the operator
2. the blower
3. the use of the blower .
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate a
blower when you are fatigued.
Be alert - if you get tired while operating
your machine, take a break. Tiredness
may result in loss of control. Working
with any blower can be strenuous. If you
have any condition that might be
aggra
vated by strenuous work, check
your doctor before operating the
with
machine.
!Warning!
Prolonged use of a blower, (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud`s phenomenon) or
carpal tunnel syndrome. These conditions reduce the hand`s ability to feel
and regulate temperature, produce
numbness and burning sensations and
may cause nerve and circulation
damage and tissue necrosis.
!Warning!
The STIHL blower is equipped with an
antivibration system (AV). The AV
system is designed to reduce the
transmission of engine vibrations to the
operator's hands. An AV system is
recommended for those operators who
use blowers on a regular or sustained
basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A blower with loose
components or with damaged or
worn AV buffers will tend to have
higher vibration levels.
– Maintain a firm grip at all times and,
take frequent breaks.
3BR 45
Page 5
english / USA
All the above mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore continual and
regular users should monitor closely the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
!Warning!
The ignition system of your unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with pacemaker should consult
their physician and the pacemaker
manufacturer before operating this tool.
Proper Clothing
Clothing must be sturdy and snug-fitting,
but allow complete freedom of movement.
!Warning!
Avoid loose- fitting jackets,
flared or cuffed pants,
scarfs, unconfined long
hair or anything that could
be drawn into the air
intake.
Wear overalls or long
pants to protect your legs.
Do not wear shorts.
Use of gloves when
working with the blower is
recommended.
Good footing is most
important. Wear sturdy
shoes with nonslip soles.
!Warning!
To reduce the risk of injury associated
with the inhalation of dust, use a face
filter mask when using your blower in
dusty conditions.
!Warning!
Proper eye protection is a must. Even
though the discharge is directed away
from the operator, ricochets and bounce
backs can occur during blower
operations.
Never operate a blower
unless wearing goggles
or properly fitted safety
glasses with adequate
top and side protection
which comply with
ANSI Z 87.1 (or your applicable national
standard).
!Warning!
Blower noise may damage your hearing.
Wear sound barriers (ear plugs or ear
mufflers) to protect your hearing. Continual and regular users should have their
hearing checked regulary.
THE BLOWER
For illustrations and definitions of the
blower parts see the chapter on "Parts
and Controls"!
!Warning!
Never modify a blower in any way. Only
attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL blower models
are authorized. Although certain
unauthorized attachment are useable for
the STIHL blower, their use may be
extremely dangerous.
4
BR 45
Page 6
english / USA
THE USE OF THE BLOWER
Transport
Always turn off the engine before putting
down blower. When transporting your
unit in a vehicle, properly secure it to
prevent turnover, fuel spillage and
damage to the machine.
Adjust carrying harness to suit your size
before starting work.
!Warning!
Before starting work, always inspect the
rubber buffers which connect the engine
to the pack frame. If the buffers are torn
or damaged, they should be replaced by
your STIHL dealer. Failure of one or
more buffers may cause the engine or
fuel tank to hit or rub against other parts,
and may lead to serious injury from
increased vibrations or from fire as the
result of fuel leakage.
Fueling
This STIHL unit uses an oil-gasoline
mixture for fuel (see the chapter on
"Fuel" of your owner`s manual).
!Warning!
Gasoline is an extremely
flammable fuel. If spilled
or ignited by a spark or
other ignition source, it
can cause fire and serious
burn injury or property
damage.
!Warning!
To reduce the risk of serious injury from
burns, never attempt to refuel the unit
until it has been completely removed
from the operator.
Use extreme caution when handling
gasoline or fuel mix.
Do not smoke or bring any fire or flame
near the fuel.
Fueling instructions
Fuel your machine in well-ventilated
areas, outdoors only. Always shut off the
engine and allow it to cool before
refueling. Relieve fuel tank pressure by
loosening fuel cap slowly. Never remove
fuel filler cap while engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Avoid
spilling of fuel or oil. Wipe off any spilled
fuel before starting your blower and
check for leakage.
Always tighten fuel filler cap securely
after fueling.
!Warning!
Check for fuel leakage while refueling
and during operation. If fuel or oil
leakage is found, do not start or run the
engine until leak is fixed and spilled fuel
has been wiped away. Take care not to
get fuel on your clothing. If this happens,
change your clothing immediately.
Always store gasoline in a container
approved for flammable liquids.
Different models may be equipped with
different fuel caps.
Cap with Grip
!Warning!
In order to reduce the risk of fuel spillage
and fire from an improperly tightened
fuel cap, correctly position and tighten
the fuel cap in the fuel tank opening.
To do this with this STIHL
cap, raise the grip on the
top of the cap until it is
upright at a 90° angle.
Insert the cap in the fuel
tank opening with the
triangular marks on the grip of the cap
and on the fuel tank opening lining up.
Using the grip, turn the cap firmly
clockwise as far as it will go (approx. a
quarter turn).
5BR 45
Page 7
english / USA
Fold the grip flush with the
top of the cap. If the grip
does not lie completely
flush with the cap and the
detent on the grip does
not fit in the
corresponding recess in the filler neck,
the cap is not properly seated and
tightened and you must repeat the
above steps.
Screw Cap
!Warning!
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill
quantities of fuel. In order
to reduce the risk of fuel
spillage and fire, tighten the fuel filler cap
by hand with as much force as possible.
Before Starting
!Warning!
Never operate your machine if it is
damaged, improperly adjusted or not
completely and securely assembled.
You should always inspect your unit
before starting it. Make sure the unit is
properly assembled, in good operating
condition and the controls and safety
devices are working properly.
!Warning!
To reduce the risk of injury from thrown
parts, check your fanwheel and fan
housing for damage (cracks, nicks,
chipping). If any damage is found, stop
using the unit and contact your STIHL
dealer for repair.
– Throttle trigger must move freely
and spring back to idle position
when released.
– Stop switch must move easily to $
– Tightness of spark plug boot - if boot
is loose, sparks may occur and
ignite the escaping fuel vapor!
Starting
!Warning!
Your blower is a one-person machine.
To reduce the risk of eye or other injury
from thrown objects, insure that bystanders are at least 50 feet (15m) away
during use.
Stop the engine immediately if you are
approached.
For specific starting instructions, see the
appropriate section of your owner`s
manual. Place the machine on firm
ground or other solid surface in an open
area. Maintain good balance and secure
footing.
!Warning!
When you pull the starter grip, don`t
wrap the starter rope around your hand.
Do not allow the grip to snap back, but
guide the starter rope slowly back to
permit the rope to rewind properly.
Failure to follow this procedure may
result in injury to hand or fingers and
may damage the starter mechanism.
Catalytic converter
!Warning!
Some STIHL blower
models are equipped with
a catalytic converter,
which is designed to
reduce the exhaust
emissions of the engine
by a chemical process in the muffler.
Due to this process, the muffler does not
cool down as rapidly as conventional
mufflers when the engine returns to idle
or is shut off. To reduce the risk of fire
and burn injuries, the following specific
safety precautions must be observed.
6
BR 45
Page 8
english / USA
!Warning!
Since a muffler with a catalytic converter
cools down less rapidly than
conventional mufflers, always set your
backpack blower down in the upright
position and never locate it where the
muffler is near dry brush, grass, wood
chips or other combustible materials
while it is still hot. Let the engine cool
down sitting on concrete, metal, bare
ground or solid wood (e.g. the trunk of a
felled tree) away from any combustible
substances.
!Warning!
To reduce the risk of fire or burn injury,
let the unit cool down before refueling
your blower after use.
!Warning!
Never disassemble or modify your
muffler. The muffler could be damaged
and cause an increase in heat radiation
or sparks, thereby increasing the risk of
fire or burn injury. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL Servicing Dealer only.
!Warning!
To reduce the risk of fire or burn injury,
keep the area around the muffler clean.
Remove all debris such as pine needles,
branches or leaves.
!Warning!
An improperly mounted or damaged
cylinder housing or a damaged/
deformed muffler shell may interfere
with the cooling effect of the catalytic
converter. To reduce the risk of fire or
burn injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a damaged/
deformed muffler shell.
Your catalytic converter is furnished with
screens designed to reduce the risk of
fire from the emission of hot particles.
Due to the heat from the catalytic
reaction, these screens will normally
stay clean and need no service or
maintenance. If you experience loss of
performance and you suspect a clogged
screen, have your muffler maintained by
a STIHL Servicing Dealer.
Working instructions
Work carefully.
The assistance of another person may
be needed in placing the unit on your
back after starting. In order to reduce the
risk of injury to the assistant from thrown
objects or from contact with fumes, the
engine should be kept at idle speed
during this brief period, and your
assistant should not stand in the area of
the outlet nozzle or exhaust. Otherwise,
the unit should be started and operated
without assistance.
Operate the blower under good visibility
and daylight conditions only.
!Warning!
Your blower produces
poisonous exhaust fumes
as soon as the combus-
tible engine is running.
These gases (e.g. carbon
monoxide) may be colorless and odorless.
To reduce the risk of serious or fatal
injury from breathing toxic fumes, never
start or run the blower indoors or in
poorly ventilated locations. Ensure
proper ventilation when working in
trenches or other confined areas.
Keep the space behind and beside the
engine clear at all times to allow for the
escape of hot and toxic exhaust fumes.
7BR 45
Page 9
english / USA
!Warning!
Use of this product can generate dust,
mists, and fumes containing chemicals
known to cause respiratory disease,
cancer, birth defects, or other reproductive harm. If you are unfamiliar with the
risks associated with the particular dust,
mists or fumes at issue, consult your
employer, governmental agencies such
as OSHA and NIOSH and other sources
on hazardous materials. If the substance
being blown or vacuumed is a commercial substance, review the material
safety data sheet for that substance and
/ or consult the material manufacturer /
supplier. The state of California and
some other authorities, for instance,
have published lists of substances
known to cause cancer, reproductive
toxicity, etc.
Control dust, mist and fumes at the
source where possible. In this regard
use good work practices and follow the
recommendations of OSHA / NIOSH
and occupational and trade associations. When the inhalation of toxic dust,
mists and fumes cannot be eliminated,
the operator and any bystanders should
always wear a respirator approved by
NIOSH / MSHA for the substance at
issue.
!Warning!
Dust with silica in its composition may
contain crystalline silica. Silica is a basic
component of sand, quartz, brick, clay,
granite and numerous other minerals
and rocks, including masonry and concrete products. Repeated and / or substantial inhalation of airborne crystalline
silica can cause serious or fatal respiratory disease, including silicosis. In addition, the state of California and some
other authorities have listed respirable
crystalline silica as a substance known
to cause cancer. When encountering
such materials, always follow the respiratory precautions mentioned above.
!Warning!
Breathing asbestos dust is dangerous
and can cause severe or fatal injury, respiratory illness or cancer. The use and
disposal of asbestos containing
have been strictly regulated by OSHA
and the Environmental Protection
Agency. Do not blow or disturb asbestos
or asbestos containing products, such
as asbestos insulation. If you have any
reason to believe that you might be
disturbing asbestos, immediately
your employer or a local OSHA
representative.
products
contact
374BA001 KN
Carry the powerhead on your back.
Hold control handle firmly in your hand
and always keep the handle to the right
side of your body. Make sure you have
good balance and secure footing.
271BA003 KN
In an emergency, throw off the blower
by opening the quick-release fastener
on the waist strap and slipping out of the
shoulder straps.
Before using the blower for the first time,
practice opening the quick-release
fastener several times so that you know
how it works.
8
BR 45
Page 10
english / USA
When working with the blower, always
wrap your fingers tightly around the
handle, keeping the control handle
cradled between your thumb and
forefinger. Keep your hand in this
position to have your machine under
control at all times. Make sure your
control handle is in good condition and
free of moisture, pitch, oil or grease.
!Warning!
To reduce the risk of personal injury, do
not direct air blast towards bystanders,
since the high pressure of the air flow
could injure eyes and could blow small
objects at great speed. Do not direct air
blast towards pets.
!Warning!
Always shut off the engine before
cleaning or servicing the unit or
replacing parts. Always disconnect the
spark plug before performing
maintenance or accessing movable
parts.
The blower fan between the air intake
and output openings rotates whenever
the engine is running. In order to reduce
the risk of injury from contact with the
fan, never operate your unit without a
properly mounted intake screen and
blower tube. Never insert any foreign
object into the air intake or output
openings of the machine.
Pay attention to the direction of the wind,
i.e., do not work against the wind.
To reduce the risk of stumbling and loss
of control, do not walk backward while
operating the machine.
000 LA
A
MAINTENANCE, REPAIR AND
326B
STORING
Maintenance, replacement, or repair
of the emission control devices and
systems may be performed by any
nonroad engine repair establishment
or individual. However if you claim
warranty for a component which has
not been serviced or maintained properly or if nonapproved replacement
parts were used, STIHL may deny
warranty.
Use only identical STIHL replacement
parts for maintenance and repair.
Use of parts manufactured by others
may cause serious or fatal injury.
Follow the maintenance and repair
instructions in the appropriate section of
your owner's manual. Refer to the
maintenance chart at the last pages of
this manual.
!Warning!
Always stop the engine and make sure
that the fan is stopped before doing any
maintenance or repair work or cleaning
the blower. Do not attempt any maintenance or repair work not described in
your owner's manual. Have such work
performed at your STIHL service shop
only.
Check fuel filler cap for leaks at regular
intervals. Use the specified spark plug
and make sure it and the ignition lead
are always in good condition.
!Warning!
A worn or damaged muffler is a fire
hazard and may cause loss of hearing.
Check to see that the muffler is in good
condition. The blower must not be
ted if the muffler is not functioning properly or has been removed.
Remember that the risk of forest fires is
greater in hot weather. Use the spark
arresting muffler supplied with the unit.
Never touch a hot muffler or burn will
result.
opera-
9BR 45
Page 11
english / USA
!Warning!
In order to reduce the risk of fire, do not
modify or remove any part of the muffler
or spark arrestor.
Keep spark plug and wire connection
tight and clean. The spark plug electrode
gap should be checked with a feeler
gauge at least every 50 operating hours
and reset if necessary. Fit a new spark
plug if the electrodes are badly pitted.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of this manual.
Store blower in a dry, high or locked
location place and out of reach of
children.
Before storing for longer than a few
days, always empty the fuel tank.
Assembling the Blower
1
1
4
5
3
2
4
1
374BA002 KN
: Loosen the screws (1). : Push the elbow (2) with lug (3) into
the fan housing stub (5) as far as the
stops (4).
374BA003 KN
10
BR 45
Page 12
english / USA
8
1
1
5
4
2
1
: Rotate the elbow (2) in the direction
of the arrow (clockwise) until the
stops (4) line up with the grooves in
the fan housing stub (5) and then
push it home in the direction of the
arrow.
: Tighten the screws (1) firmly.
7
6
374BA004 KN
: Loosen the screw (6).
: Push home the blower tube (7) as
far as stop.
: Tighten the screw (6) firmly.
6
374BA005 KN
Adjusting the Control Handle
: Put the machine on your back.
: Loosen the clamp screw (6).
: Move the control handle (8) along
the tube to the most comfortable
position.
: Tighten the clamp screw (6) firmly.
374BA006 KN
11BR 45
Page 13
english / USA
11
7
: Push nozzle (9) onto the blower
tube (7) as far as pin (10), position a
(long) or position b (short), and
rotate it in the direction of the arrow
to lock in position.
10
a
b
9
374BA007 KN
Removing the Elbow
: Loosen the screws (1).
1
1
5
1
374BA002 KN
: Use a suitable tool to raise the
tab (11) on the fan housing stub (5).
Rotate the elbow in the direction of
the arrow (counterclockwise) and
pull it out.
374BA008 KN
12
BR 45
Page 14
Fitting Backpack
english / USA
A
B
Adjusting the harness straps
: Pull the ends of the straps (A)
downward to tighten the harness.
: Lift the tabs of the sliding adjusters
(B) to slacken the harness straps.
: Close and lock quick-action
fastener (C) by pushing it together.
: Squeeze the hooks to open the
quick-action fastener (D).
3
2
3
2
1
Adjusting backpack
: Close and lock the hip belt (1) and
adjust so that it fits snugly against
your hip.
: Adjust harness straps (2) to correct
length.
: Use straps (3) to fix position of
harness – (adjust to size).
: Back padding must fit firmly and
securely against your back.
C
D
271BA009 KN
Removing backpack
: Open quick-action fastener on hip
belt and take off the backpack.
13BR 45
Page 15
english / USA
Fuel
This engine is certified to operate on
unleaded gasoline and with the mix
ratio 50:1.
Your two-stroke engine requires a
mixture of brand-name gasoline and
quality two-stroke engine oil with the
classification TC.
Use regular branded unleaded gasoline
with a minimum octane rating of 89
RON. If the octane rating of the regular
grade gasoline in your area is lower use
premium unleaded fuel.
Note: Units with a catalytic converter
require unleaded gasoline. The
efficiency of the catalytic converter can
drop more than 50 % if several tankfuls
of leaded gasoline are used.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
name branded fuels!
Use only STIHL two-stroke engine oil or
equivalent branded two-stroke aircooled engine oils with the classification
TC for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STlHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils.
Use only STIHL 50:1 heavy-duty
engine oil or equivalent quality two
stroke engine oils for the fuel mix in
models with a catalytic converter.
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The fuel tank and the canister in which
fuel mix is stored should be cleaned
from time to time.
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Gasoline
US gal. US fl.oz
12.6
2 1/2 6.4
512.8
Dispose empty mixing-oil canisters only
at authorized disposal locations.
Oil (STIHL 50:1 or
equivalent branded TC oils)
14
BR 45
Page 16
english / USA
Fueling
Before fueling, clean the filler cap and
the area around it to ensure that no dirt
falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
In order to reduce the risk of burns
or other personal injury from
escaping gas vapor and fumes,
remove the fuel filler cap carefully
so as to allow any pressure build-up
in the tank to release slowly.
After fueling, tighten fuel cap
as securely as possible by hand.
373BA030 KN
Change the fuel pick up body
every year.
Before storing your machine for a long
period, drain and clean the fuel tank and
run engine until carburetor is dry.
Starting / Stopping the Engine
1
2
373BA007 KN
Observe safety precautions – see
chapter “Safety Precautions”.
: Slide the stop switch (1) to #
: Move the setting lever (2) to the
center position – this is the
starting throttle position.
The setting lever enables you select and
hold any throttle position between idle
(lower stop) and full throttle (upper stop).
373BA008 KN
373BA009 KN
15BR 45
Page 17
english / USA
4
: Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
Do not pull out the starter rope all
the way – it might otherwise break.
: Do not let the starter grip snap back.
Guide it slowly back into the housing
3
so that the starter rope can rewind
properly.
3
: Set the choke lever (3):
For cold start to g
For warm start to e
: Press the fuel pump bulb (4) at least
five times.
16
374BA009 KN
: Put the machine on the ground.
Check that bystanders are well clear
of the general work area and the
nozzle.
: Make sure you have a firm footing:
Hold the machine firmly with your
left hand on the handle and put one
foot against the base to prevent it
slipping.
374BA010 KN
374BA011 KN
If engine is cold:
(choke lever on gggg)
: Pull the starter rope 5 times.
: Move choke lever (3) to e
: Continue cranking until the engine
runs.
BR 45
Page 18
If conditions are unfavorable and
the engine does not start after 10
pulls of the starter rope with the
choke set to e :
Set choke to gggg, pull the starter rope
5 times, move choke lever to e and
continue cranking.
If engine is warm:
: Continue cranking until the engine
runs (choke lever on e).
2
As soon as engine runs:
: Move the setting lever (2) to the
lower stop so that the engine settles
down to idle speed.
If the engine stops during warm-up or
under acceleration:
: Repeat starting procedure as
described under "If engine is cold".
english / USA
1
373BA014 KN
To stop the engine:
: Move the stop switch (1) to $
If the engine does not start
: Check that all settings are correct
(choke, throttle trigger in starting
throttle position, stop switch on I).
: Repeat starting procedure.
373BA015 KN
Your machine is now ready for
operation.
17BR 45
Page 19
english / USA
Operating Instructions
If the engine still does not start:
: Move stop switch to $
5
: Pull off the spark plug boot (5).
: Unscrew and dry off the spark plug.
: Open the throttle fully.
: Pull the starter rope several times to
clear the combustion chamber.
: Refit the spark plug and connect the
spark plug boot – push it down
firmly.
: Move stop switch to I
: Set choke lever to e
– even if the engine is cold.
: Now start the engine.
4
374BA012 KN
Fuel tank run until dry
: After refueling, press the fuel pump
bulb (4) at least five times – even if
the bulb is filled with fuel.
: Now start the engine.
During break-in period
A factory new machine should not be run
at high revs (full throttle off load) for the
first three tank fillings. This avoids
unnecessary high loads during the
break-in period.
As all moving parts have to bed in during
the break-in period, the frictional
resistances in the engine are greater
during this period. The engine develops
its maximum power after about 5 to 15
tank fillings.
During operation
After a long period of full-throttle
operation, allow engine to run for a while
at idle speed so that the heat in the
374BA013 KN
engine can be dissipated by flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
After finishing work
Wait for engine to cool down. Drain the
fuel tank. Store the machine in a dry
place. Check tightness of nuts and
screws (not adjusting screws) at regular
intervals and retighten as necessary.
18
BR 45
Page 20
Using the Blower
english / USA
The BR 45 blower is designed for singlehanded operation. It is carried as a
backpack and operated with the right
hand on the control handle.
The powerful ground-level airstream
can be aimed highly accurately and
effectively.
The blower can be used for clearing
leaves, grass, paper, dust and light snow
in yards, gardens, sports stadiums,
parks, driveways and parking lots. It is
also suitable for drying cars and clearing
forest paths.
Working techniques
To minimize blowing time, use rakes and
brooms to loosen debris before blowing.
Recommended working techniques to
minimize airborne debris and pollution:
: In dusty conditions, slightly dampen
surfaces.
: Use the full blower nozzle extension
so the air stream can work close to
the ground.
: Do not direct debris at people,
children, pets, as open windows or
freshly-washed cars. Blow debris
safely away.
: After using blowers, CLEAN UP.
374BA014 KN
Dispose of debris in trash
receptacles. Do not blow debris
onto neighbouring properties.
Recommended working techniques to
minimize noise:
: Operate power equipment only at
reasonable hours - not early in the
morning, late at night or during the
noon-break when people might be
disturbed. Comply with times listed
in local ordinances. Usual
recommendations are 9:00 a.m. to
12:00 a.m. and 03:00 p.m. to 5:00
p.m. on workdays for professionals.
Special considerations should be
given to neighbours on weekends.
: Fewer engines mean less noise;
therefore use only one piece of
power equipment at a time, when
possible.
: Operate power blowers at the
lowest possible throttle speed to do
the job.
: Check your equipment before
operation, especially the muffler, air
intakes and air filters.
Conserve water by using power blowers
instead of hoses for those lawn and
garden applications where a blower can
be properly used, such as cleaning
patios or porches.
19BR 45
Page 21
english / USA
Cleaning the Air Filter
2
1
Dirty air filters reduce engine power
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of
engine power
: Move choke lever to g
: Squeeze the tabs (1) together,
swing filter cover (2) open and take
it away.
: Clean away loose dirt from around
the filter.
4
295BA019 KN
: Take the filter (3) out of the
housing (4).
: Install a new filter. As a temporary
measure you can knock it out on the
palm of your hand or blow it out with
compressed air – do not wash!
: Replace any damaged parts.
: Fit the filter (3) in the housing (4).
: Fit the filter cover (2) so that it snaps
into positon.
3
Motor Management
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
295BA046 KN
20
BR 45
Page 22
Adjusting the Carburetor
english / USA
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum
fuel-air mixture under most operating
conditions.
With this carburetor it is only possible to
correct the adjustment of the high speed
screw within fine limits.
Standard Setting
L
H
: Shut off the engine.
: Turn high speed screw (H) counter-
clockwise as far as stop (max.
turn).
: Open the low speed screw (L) one
full turn.
3
/4
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level:
: Check air filter and clean if
necessary.
295BA044 KN
: Warm up the engine.
At high altitude
: Turn high speed screw (H) clock-
wise (leaner) no further than stop.
At sea level
: Turn high speed screw (H) counter-
clockwise (richer) no further than
stop.
21BR 45
Page 23
english / USA
Catalytic Converter* Checking the Spark Plug
Adjusting Idle Speed
L
LA
Engine stops while idling
: Open the low speed screw (L) one
full turn.
: Turn idle speed screw (LA)
clockwise until the engine runs
smoothly – then turn it back about
1
/4 turn from that position.
Erratic idling behavior, poor
acceleration
(although low speed screw is one full
turn open)
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Units with a catalytic converter* may
only be operated with unleaded
gasoline and STIHL two cycle engine
oil or equivalent quality two cycle engine
oils in a mix ratio of 50:1 (see chapter
“Fuel”).
The catalylic converter in the muffler
reduces noxious emissions in the
exhaust gas.
295BA045 KN
Correct adjustment of the carburetor (if
adjustable) and observance of the
specified mix ratio of gasoline and two
cycle engine oil are essential to
minimize harmful exhaust emissions
and ensure a long catalyst service life.
000BA002 KN
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
22
* see “Guide to Using this Manual”
BR 45
Page 24
english / USA
Engine Running Behavior
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
: Remove spark plug - see “Starting /
Stopping the Engine“.
: Clean dirty spark plug.
: Check electrode gap (A) and
readjust if necessary – see
"Specifications".
: Use only resistor type spark plugs
of the approved range.
Rectify problems which have caused
fouling of spark plug:
: Too much oil in fuel mix.
: Dirty air filter.
: Unfavorable running conditions,
e.g. operating at part load.
Fit a new spark plug after approx. 100
operating hours
or earlier if the electrodes are badly
eroded.
If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor properly
adjusted, the cause may be in the
muffler.
Have the muffler checked for
contamination (coking) by a STIHL
dealer.
1
000BA036 TR
To reduce the risk of fire and burn
injury, use only spark plugs
authorized by STIHL. Always press
spark plug boot (2) snugly onto
spark plug boot (1) of the proper
size. (Note: If boot has detachable
SAE adapter nut, it must be
attached.)
A loose connection between spark
plug boot and ignition wire
connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
23BR 45
Page 25
english / USA
Rewind Starter Storing the Machine
To help prolong the wear life of the
starter rope, observe the following
points:
: Pull the starter rope only in the
direction specified.
: Do not pull the rope over the edge of
the guide bush.
: Do not pull out the rope more than
specified since it might break.
: Do not let the starter grip snap back,
guide it slowly into the housing.
See also chapter “Starting /
Stopping the Engine”!
Replace a damaged starter rope in
good time or have it replaced by your
STIHL dealer!
For periods of about 3 months or
longer
: Drain and clean the fuel tank in a
well ventilated area.
: Run engine until carburetor is dry –
this helps prevent carburetor
diaphragms sticking together.
: Thoroughly clean the machine – pay
special attention to the cylinder fins
and air filter.
: Store the machine in a dry, high or
locked location - out of the reach of
children and other unauthorized
persons.
24
BR 45
Page 26
Maintenance Chart
Please note that the following maintenance intervals apply for normal operating
conditions. If your daily working time is longer than normal or working conditions
are difficult (very dusty work area, etc.), shorten the specified intervals
accordingly.
Complete machine
Control handle Check operation
Air filter
Filter in fuel tank
Fuel tank Clean
Carburetor
Spark plug Readjust electrode gap
Cooling inlets Clean
Spark arresting screen in muffler
Accessible screws and nuts
(not adjusting screws)
Anti-vibration elements
Visual inspection (condition, leaks)
Clean
Clean
Replace
Check
Replace
Check idle adjustment
Readjust idle
Check
Clean or replace
Retighten
Visual inspection
Have replaced by STIHL dealer
before
starting work
after finishing
work or daily
after each
refueling stop
weekly
xx
x
xx
xx
x
x
english / USA
monthly
yearly
if problem
if damaged
as required
x
x
x
xx
x
x
x
x
x
x
xx
25BR 45
Page 27
english / USA
Main Parts and Controls
1
3
5
4
6
8
7
9
2
10
11
12
1 Tab
15
16
13
14
17
18
374BA015 KN
2 Muffler (with spark arresting
screen)*
3 Spark plug boot
4 Carburetor adjusting screws
5 Choke lever
6 Starter grip
7 Fuel pump
8 Filter housing
9 Fuel filler cap
10 Fuel tank
11 Setting lever
12 Throttle trigger
13 Stop switch
14 Control handle
15 Shoulder strap
16 Back padding
17 Waist strap
18 Support frame
19 Anti-vibration elements
20 Pleated hose
21 Throttle cable
22 Blower tube
23 Nozzle
26
19 19
# Serial number
21
#
20
2322
374BA016 KN
* see "Guide to Using this Manual"
BR 45
Page 28
Definitions
1. Tab
For attaching blower tube to fan
housing.
2. Muffler
(with spark arresting screen)
Reduces exhaust noises and
diverts exhaust gases away from
operator. Spark arresting screen is
designed to help reduce risk of fire.
3. Spark Plug Boot
Connects the spark plug to the
ignition lead.
4. Carburetor Adjusting Screws
For tuning the carburetor.
5. Choke Lever
Eases engine starting by enriching
mixture.
6. Starter Grip
The grip of the pull starter, which is
the device to start the engine.
7. Fuel Pump
Provides additional fuel feed for a
cold start.
8. Filter Housing
Encloses and protects the air filter.
9. Fuel Filler Cap
For closing the fuel tank.
10. Fuel Tank
For fuel mixture consisting of
gasoline and oil.
11. Setting Lever
Holds throttle in different positions.
12. Throttle Trigger
Controls the speed of the engine.
13. Stop Switch
Stops the engine.
14. Control Handle
Handle for holding and directing
blower tube in the required
direction.
15. Shoulder Strap
For carrying the machine.
16. Back Padding
Improves carrying comfort.
17. Waist Strap
Helps support and distribute load.
english / USA
18. Support Frame
Accommodates powerhead and is
carried on user’s back.
19. Anti-vibration Elements
Designed to help reduce
transmission of engine vibrations to
user’s back.
20. Pleated Hose
For spraying, distributing or
spreading in the required direction.
21. Throttle Cable
Connects the control handle to the
powerhead.
22. Blower Tube
Directs spray or airstream.
23. Nozzle
Aims and widens the spray or
airstream.
27BR 45
Page 29
english / USA
Specifications Maintenance and Repairs
EPA:
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category A = 300 hours, B = 125 hours,
C = 50 hours
CARB:
The Emission Compliance Period used
on the CARB Air Index Label indicates
the terms:
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours
Engine
Single cylinder two-stroke engine
Displacement: 1.66 ci (27.2 cc)
Bore: 1.34 in (34 mm)
Stroke: 1.18 in (30 mm)
Idle speed: 2,800 RPM
Engine power: 0.88 HP
(0.65 kW)
Sound level according to
ANSI B 175.2-1999
65 dB(A)
Air flow rate
390 CFM (665 m3/h)
Air velocity
116 MPH ( 52 m/ s)
Ignition System
Type
Electronic magneto ignition
Spark plug (resistor type)
Bosch WSR 6 F, NGK BPMR 7 A or
Champion RCJ 6Y
Electrode gap
0.02 in (0.5 mm)
Spark plug thread
M 14x1.25; 0.37 in (9.5 mm) long
Fuel System
Carburetor
All position diaphragm carburetor with
integral fuel pump
Air filter
Felt mat
Fuel tank capacity
13.5 fl.oz (0.40 L)
Fuel mix
see chapter "Fuel"
The user of this unit should carry out
only the maintenance operations
described in this manual. Other repair
work may be performed only by an
authorized STIHL dealer.
Warranty claims following repairs can be
accepted only if the repair has been
performed by an authorized STIHL
dealer using original STIHL replacement
parts.
Original STlHL parts can be identified by
STIHl
the STIHL part number, the
logo and the STlHL parts symbol ((((.
The symbol may appear alone on small
parts.
STIHl
STIHlSTIHl
28
BR 45
Page 30
STIHL Incorporated Federal and California Emission Control Warranty Statement
english / USA
Your Warranty Rights
and Obligations
The U.S. Environmental Protection
Agency (EPA), the California Air
Resources Board (CARB) and STIHL
Incorporated are pleased to explain the
Emission Control System Warranty on
your model year 2000 and later
equipment type engine. In California,
new small off-road engines must be
designed, built and equipped to meet the
State's stringent anti-smog standards. In
other states, new 1997 and later model
year small off-road equipment engines
must be designed, built and equipped, at
the time of sale, to meet the U.S. EPA
regulations for small non road engines.
The equipment engine must be free from
defects in materials and workmanship
which cause it to fail to conform with
U.S. EPA standards for the first two
years of engine use from the date of sale
to the ultimate purchaser.
STIHL Incorporated must warrant the
emission control system on your small
off-road engine for the period of time
listed below provided there has been no
abuse, neglect or improper maintenance
of your small off-road equipment engine.
Your emission control system includes
parts such as the carburetor and the
ignition system. Also included may be
hoses, and connectors and other
emission related assemblies.
Where a warrantable condition exists,
STIHL Incorporated will repair your
small off-road equipment engine at no
cost to you, including diagnosis (if the
diagnostic work is performed at an
authorized dealer), parts, and labor.
Manufacturer's Warranty
Coverage:
The small off-road equipment engines
are warranted for two years in California.
In other states, 1997 and later model
year small off-road equipment engines
are also warranted for two years. If any
emission-related part on your engine is
defective, the part will be repaired or
replaced by STIHL Incorporated free of
charge.
Owner's Warranty
Responsibilities:
As the small off-road equipment engine
owner, you are responsible for the performance of the required maintenance
listed in your owner's manual. STIHL
Incorporated recommends that you
retain all receipts covering maintenance
on your small off-road equipment
engine, but STIHL Incorporated cannot
deny warranty solely for the lack of
receipts or for your failure to ensure the
performance of all scheduled
maintenance.
Any replacement part or service that is
equivalent in performance and durability
may be used in non-warranty maintenance or repairs, and shall not reduce the
warranty obligations of the engine
manufacturer.
As the small off-road equipment engine
owner, you should be aware, however,
that STIHL Incorporated may deny you
warranty coverage if your small off-road
equipment engine or a part has failed
due to abuse, neglect, improper
maintenance or unapproved
modifications.
You are responsible for presenting your
small off-road equipment engine to a
STIHL service center as soon as a
problem exists. The warranty repairs will
be completed in a reasonable amount of
time, not to exceed 30 days.
If you have any questions regarding your
warranty rights and responsibilities,
please contact a STIHL customer
service representative at
1-800-467-8445 or you can write to
STIHL Inc., 536 Viking Drive,
P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the
ultimate purchaser and each
subsequent purchaser that your small
off-road equipment engine will be
designed, built and equipped, at the time
of sale, to meet all applicable
regulations. STIHL Incorporated also
warrants to the initial purchaser and
each subsequent purchaser that your
engine is free from defects in materials
and workmanship which cause the
engine to fail to conform with applicable
regulations for a period of two years.
29BR 45
Page 31
english / USA
Warranty Period
The warranty periods will begin on the
date the utility equipment engine is
purchased by the initial purchaser and
you have signed and sent back the
warranty card to STIHL. If any emission
related part on your engine is defective,
the part will be replaced by STIHL
Incorporated at no cost to the owner.
Any warranted part which is not
scheduled for replacement as required
maintenance, or which is scheduled only
for regular inspection to the effect of
"repair or replace as necessary" will be
warranted for the warranty period.
Any warranted part which is scheduled
for replacement as required maintenance will be warranted for the period of
time up to the first scheduled replacement point for that part.
Diagnosis
You, as the owner, shall not be charged
for diagnostic labor which leads to the
determination that a warranted part is
defective. However, if you claim
warranty for a component and the
machine is tested as non-defective,
STIHL Incorporated will charge you for
the cost of the emission test.
Mechanical diagnostic work will be
performed at an authorized STIHL
servicing dealer. Emission test may be
performed either at STIHL Incorporated
or at any independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized STIHL
servicing dealer or warranty station. Any
such work shall be free of charge to the
owner if it is determined that a warranted
part is defective. Any manufacturerapproved or equivalent replacement part
may be used for any warranty
maintenance or repairs on emissionrelated parts and must be provided
without charge to the owner. STIHL
Incorporated is liable for damages to
other engine components caused by the
failure of a warranted part still under
warranty.
The California Air Resources Board's
Emission Warranty Parts List specifically
defines the emission-related warranted
parts. These warranted parts are:
Carburetor
Choke (Cold start enrichment system)
Intake manifold
Air filter
Spark plug
Magneto or electronic ignition system
(ignition module)
Catalytic converter (if applicable)
Fasteners
Where to make a claim for
Warranty Service
Bring the product to any authorized
STIHL servicing dealer and present the
signed warranty card.
Maintenance Requirements
The maintenance instructions in this
manual are based on the application of
the recommended 2-stroke fuel-oil
mixture (see also instruction "Fuel").
Deviations from this recommendation
regarding quality and mixing ratio of fuel
and oil may require shorter maintenance
intervals.
Limitations
This Emission Control Systems Warranty shall not cover any of the following:
: repair or replacement required
because of misuse, neglect or lack
of required maintenance,
: repairs improperly performed or
replacements not conforming to
STIHL Incorporated specifications
that adversely affect performance
and/or durability, and alterations or
modifications not recommended or
approved in writing by STIHL
Incorporated,
and
: replacement of parts and other
services and adjustments
necessary for required maintenance
at and after the first scheduled
replacement point.
30
BR 45
Page 32
english / USA
31BR 45
Page 33
english / USA
32
BR 45
Page 34
04583748621
english/U.S.A.lCARB/EPA
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