Stihl BR 350, STIHL BR 430 Instruction Manual
{
STIHL BR 350, 430
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 30
F Notice d’emploi
31 - 62
Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2011
0458-456-8221-A. VA1.J11.
0000004890_003_GB
BR 350, BR 430
English
1
{
Contents
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
This machine has been built using
modern production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and troublefree use of
the machine.
Please contact your dealer or our sales
company if you have any queries
concerning your machine.
Your
Hans Peter Stihl
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Assembling the Unit 7
Adjusting the Throttle Cable 10
Fitting the Harness 10
Fuel 11
Fueling 12
Information Before You Start 12
Starting / Stopping the Engine 13
Operating Instructions 15
Replacing the Air Filter 16
Engine Management 16
Adjusting the Carburetor 17
Spark Plug 18
Engine Running Behavior 19
Replacing the Starter Rope and
Rewind Spring 19
Storing the Machine 21
Inspections and Maintenance by
Dealer 22
Maintenance and Care 23
Main Parts 25
Specifications 27
Special Accessories 28
Maintenance and Repairs 28
STIHL Limited Emission Control
Warranty Statement 29
BR 350, BR 430
English
2
Pictograms
The meanings of the pictograms
attached to the machine are explained in
this manual.
Depending on the model concerned, the
following pictograms may be attached to
your machine.
Symbols in text
Warning where there is a risk of an
accident or personal injury or serious
damage to property.
Caution where there is a risk of
damaging the machine or its individual
components.
Engineering improvements
STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.
Therefore, some changes, modifications
and improvements may not be covered
in this manual.
Observe all applicable local safety
regulations, standards and ordinances.
If you have not used this power tool
model before: Have your dealer or other
experienced user show you how to
operate your power tool or attend a
special course in its operation.
Minors should never be allowed to use a
power tool.
Keep bystanders, especially children,
and animals away from the work area.
When the power tool is not in use, shut if
off so that it does not endanger others.
Secure it against unauthorized use.
The user is responsible for avoiding
injury to third parties or damage to their
property.
Guide to Using this Manual
Fuel tank; fuel mixture of
gasoline and engine oil
Operate manual fuel
pump
Safety Precautions and
Working Techniques
Special safety precau
-
tions must be observed
when working with a
power tool.
It is important you read
and understand the
instruction manual before
first use and keep the
manual in a safe place for
future reference. Nonobservance of the safety
precautions may result in
serious or even fatal
injury.
BR 350, BR 430
English
3
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using your power tool
understands the information contained
in this manual.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
Do not operate your power tool if any of
its components are damaged.
Do not use a pressure washer to clean
the power tool. The solid jet of water
may damage parts of the power tool.
Accessories and Spare Parts
Only use parts and accessories that are
explicity approved for this power tool by
STIHL or are technically identical. If you
have any questions in this respect,
consult a servicing dealer. Use only high
quality parts and accessories in order to
avoid the risk of accidents and damage
to the power tool.
STIHL recommends the use of genuine
STIHL replacement parts. They are
specifically designed to match your
model and meet your performance
requirements.
Never attempt to modify your power tool
in any way since this may increase the
risk of personal injury. STIHL excludes
all liability for personal injury and
damage to property caused while using
unauthorized attachments.
Physical Condition
To operate the power tool you must be
rested, in good physical condition and
mental health.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.
Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce health risks, STIHL recommends
that persons with pacemakers consult
their physician and the pacemaker
manufacturer before operating this tool.
Do not operate the power tool if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
Applications
The blower is designed for blowsweeping leaves, grass, paper and
similar materials, e.g. in gardens, sports
stadiums, car parks and driveways. It is
also suitable for blow-sweeping forest
paths.
Do not blow-sweep hazardous
materials.
Do not use the power tool for any other
purpose because of the increased risk of
accidents and damage to the power tool
itself. Never attempt to modify the power
tool in any way since this may result in
accidents or damage to the power tool.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Wear sturdy shoes with non-slip soles.
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
Transporting the Power Tool
Always stop the engine.
Transporting in a vehicle:
– Properly secure your power tool to
prevent turnover, fuel spillage and
damage.
Clothing must be sturdy
but allow complete free
-
dom of movement. Wear
snug-fitting clothing, an
overall and jacket combi
-
nation, do not wear a
work coat.
Avoid any clothing,
scarves, neckties, jewel
-
lery or anything that could
get into the air intake. Tie
up and confine long hair
(e.g. with a hair net, cap,
hard hat, etc.).
Wear safety glasses and
hearing protection, e.g.
earplugs or ear muffs.
BR 350, BR 430
English
4
Fueling
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
Always remove the power tool from your
back and put it on the ground before
refueling. Fuel the unit only when it is
standing on the ground.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.
Fuel your power tool only in wellventilated areas. If you spill fuel, wipe
the machine immediately – if fuel gets on
your clothing, change immediately.
Bayonet fuel cap
Never use a tool to open or close the
bayonet-type fuel cap. This may
damage the cap and cause fuel leakage.
Close the bayonet-type fuel cap
carefully after refueling.
Before Starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manual.
– Throttle trigger must move freely
and spring back to the idle position
when released.
– The setting lever must move easily
to STOP or 0
– The blower tubes must be properly
assembled.
– Keep the handles dry and clean –
free from oil and dirt – for safe
control of the power tool.
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Never attempt to modify the controls
or the safety devices in any way.
– Check condition of blower housing.
A worn blower housing (cracks, nicks,
chips) may result in an increased risk of
injury from thrown foreign objects. If the
blower housing is damaged, consult
your dealer – STIHL recommends you
contact a STIHL servicing dealer.
To reduce the risk of accidents and
personal injury, do not operate your
power tool if it is not properly assembled
and in good condition.
For emergencies: Practise quickly
opening the fastener on the waist belt,
loosening the shoulder straps and
setting down the unit.
Starting the Engine
Start the engine at least 3 meters from
the fueling spot, outdoors only.
Your power tool is designed to be
operated by one person only. Do not
allow other persons in the work area –
even when starting.
Do not drop start your machine – the
correct starting procedure is described
in the instruction manual.
Place the power tool on level ground,
make sure you have secure footing, hold
the power tool securely.
As soon as the engine starts, the air flow
may throw small objects (e.g. stones) in
your direction.
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
Check for leakage. To
reduce the risk of serious
of fatal burn injuries, do
not start or run the engine
until leak is fixed.
BR 350, BR 430
English
5
Holding and Controlling the Power Tool
The unit s carried as a backpack. Hold
and control the blower tube with your
right hand on the control handle.
Walk slowly forwards as you work –
observe the nozzle outlet at all times –
do not walk backwards – risk of
stumbling.
Always shut off the engine before taking
the unit off your back.
During Operation
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the setting lever
to STOP or 0.
To reduce the risk of personal injury , do
not allow any other persons within a
radius of 15 meters of your own position.
To reduce the risk of damage to
property, also maintain this distance
from other objects (vehicles, windows).
Do not direct the air blast towards
bystanders or animals since the air flow
can blow small objects at great speed.
When blow-sweeping (in open ground
and gardens), watch out for small
animals to avoid harming them.
Never leave a running machine
unattended.
Take special care in slippery conditions
– damp, snow, ice,
on slopes and uneven ground.
Watch out for obstacles: Be careful of
refuse, tree stumps, roots and ditches
which could cause you to trip or stumble.
Never work on a ladder or any other
insecure support.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert so as not to endanger
others.
To reduce the risk of accidents, take a
break in good time to avoid tiredness or
exhaustion.
To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.
To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.
To reduce the risk of fire, do not smoke
while operating or standing near your
power tool. Note that combustible fuel
vapor may escape from the fuel system.
If dust levels are very high, always wear
a suitable respirator.
Operate your power tool so that it
produces a minimum of noise and
emissions – do not run the engine
unnecessarily, accelerate the engine
only when working.
0009BA001 KN
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These fumes
may be colorless and
odorless and contain
unburned hydrocarbons
and benzol. Never run
the engine indoors or in
poorly ventilated loca
-
tions, even if your model
is equipped with a cata
-
lytic converter.
BR 350, BR 430
English
6
After finishing work, put the unit down on
a level, non-flammable surface. To
reduce the risk of fire, do not put it down
near easily combustible materials (e.g.
wood chips, bark, dry grass, fuel).
If your power tool is subjected to
unusually high loads for which it was not
designed (e.g. heavy impact or a fall),
always check that it is in good condition
before continuing work – see also
"Before Starting Work". Check the fuel
system in particular for leaks and make
sure the safety devices are working
properly. Do not continue operating your
power tool if it is damaged. In case of
doubt, have the machine checked by
your servicing dealer.
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands (whitefinger
disease).
No general recommendation can be
given for the length of usage because it
depends on several factors.
The period of usage is prolonged by:
– Keeping your hands warm
– Work breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, itching).
– Low outside temperatures.
– Gripping force (a tight grip hinders
circulation).
Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.
Maintenance and Repairs
Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the instruction manual.
Have all other work performed by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
Only use high-quality replacement parts
in order to avoid the risk of accidents
and damage to the machine. If you have
any questions in this respect, consult a
servicing dealer.
STIHL recommends the use of genuine
STIHL replacement parts. They are
specifically designed to match your
model and meet your performance
requirements.
To reduce the risk of injury, always shut
off the engine before carrying out any
maintenance or repairs or cleaning the
machine. – Exception: Carburetor and
idle speed adjustments.
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed since there is otherwise a
risk of fire from uncontained sparking.
Do not service or store your machine
near open flames.
Check the fuel filler cap for leaks at
regular intervals.
Use only a spark plug of the type
approved by STIHL and make sure it is
in good condition – see "Specifications".
Inspect the ignition lead (insulation in
good condition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to
hearing, do not operate your machine if
the muffler is damaged or missing.
Do not touch a hot muffler since burn
injury will result.
Vibration behavior is influenced by the
condition of the AV elements – check the
AV elements at regular intervals.
Shut off the engine before rectifying
problems.
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 make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
BR 350, BR 430
English
7
The combination wrench and
screwdriver are in the supplied
accessory bag.
BR 350 Blower Tube
Fitting the pleated hose on the elbow
N Ease the slip ring (2) apart and push
it over the elbow (1).
N Open the hose clamp (3) and fit it on
the pleated hose (4).
N Close the hose clamp (3) – engage
tab in recess.
N Push the pleated hose (4) over the
slip ring (2) as far as stop.
N Position the hose clamp (3) as
shown in the illustration.
N Tighten down the screw (arrow).
Mounting the blower tubes and nozzle
N Assemble the blower tubes (5) and
nozzle (6).
Mounting the control handle
N Pull the ends of the clamp on the
control handle (7) apart and push it
over stub of pleated hose (4).
N Attach throttle cable to retainer on
the hose clamp (3).
Adjusting the control handle
N Put the machine on your back and
adjust the harness – see "Fitting the
Harness".
N Push the blower tube (5) into the
stub of pleated hose (4) as far as
the stop.
N Move the control handle (7) along
the tube to the most comfortable
position.
N Tighten down the screw in the
control handle (7).
Assembling the Unit
0009BA002 KN
1
2
0009BA003 KN
3
4
2
3
0009BA004 KN
4
0009BA027 KN
0009BA005 KN
6
5
5
3
0009BA006 KN
7
0009BA007 KN
5
7
BR 350, BR 430
English
8
BR 430 Blower Tube
Mounting the control handle
N Pull the two halves of the clamp
apart.
N Push the control handle (1) onto the
blower tube (2).
N Line up the control handle (1) with
the tube's seam – as shown.
N Secure the control handle (1) with
the screw (3) so that it can still be
moved on the blower tube (2).
Mounting the blower tubes
N Depending on your size and reach:
Push blower tube (1) up to the
appropriate mark on the blower
tube (2).
N Rotate the blower tube (1) in the
direction of the arrow and engage it
in the appropriate slot (3).
Mounting the hose clamps and pleated
hose
N Push the hose clamp (1) (with
retainer for throttle cable) onto the
elbow (3) – the positioning marks
must face to the left.
N Push the pleated hose (2) over the
elbow (3).
N Push the hose clamp (1) onto the
pleated hose (2).
N Line up the positioning marks on the
hose clamp (1) and elbow (3) – the
screw recess facing down.
N Secure the hose clamp (1) with the
screw (4).
N Push the hose clamp (5) (without
retainer for throttle cable) onto the
elbow (6) – the positioning marks
must face to the right.
N Push the blower tube (6) into the
pleated hose (2).
452BA101 KN
1
2
3
452BA102 KN
1
2
452BA096 KN
1
2
3
2
1
452BA108 KN
3
452BA109 KN
2
1
4
3
2
452BA103 KN
5
6
BR 350, BR 430
English
9
N Push the hose clamp (5) onto the
pleated hose (2).
N Line up the hose clamp (5) and
blower tube (6) – as shown.
N Secure the hose clamp (5) with the
screw (7).
Mounting the nozzle
N Push the nozzle (1) onto the blower
tube (2) and engage it on the
lugs (3).
Removing the nozzle
N Rotate the nozzle (1) in the direction
of the arrow until the lugs (3) are
covered.
N Pull the nozzle (1) off the blower
tube (2).
Adjusting the control handle
N Put the machine on your back and
adjust the harness – see "Fitting the
Harness".
N Move the control handle (1) along
the blower tube (2) to the most
comfortable position.
N Secure the control handle (1) with
the screw (3).
N Engage the throttle cable (4) with
sleeve (5) in the retainer (6).
Wear mark on nozzle
The front end of the nozzle wears away
due to abrasive ground contact during
operation. Replace the nozzle when it
has worn as far as the wear mark.
Fitting the transport aid
When storing or transporting the
machine:
2
5
452BA104 KN
6
7
3
1
2
452BA111 KN
3
1
2
452BA112 KN
3
452BA110 KN
1
2
452BA100 KN
BR 350, BR 430
English
10
N Secure the velcro strip to the blower
tube – pull the flap through the
buckle.
N Secure the blower tube to the
handle on the backplate.
It may be necessary to correct the
adjustment of the throttle cable after
assembling the machine or after a
prolonged period of operation.
Adjust the throttle cable only when the
unit is completely and properly
assembled.
N Set throttle trigger to the full throttle
position – as far as stop.
N Carefully rotate the screw in the
throttle trigger in the direction of the
arrow until you feel initial resistance.
Then rotate it another full turn.
Adjusting the Harness
N Pull the ends of the straps
downwards to tighten the harness.
Loosening the Harness
N Lift the tabs of the sliding adjusters.
N Adjust the harness so that the
backplate fits snugly and securely
against your back.
Adjusting the Throttle Cable
0009BA008 KN
Fitting the Harness
373BA003 KN
373BA004 KN
BR 350, BR 430
English
11
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 RON.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
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
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke aircooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped 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 ratio
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.
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Fuel
Examples
Gasoline Oil (STIHL 50:1 or equiva
-
lent high-quality oils)
liters liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
BR 350, BR 430
English
12
Preparations
N Before fueling, clean the bayonet-
type fuel cap and the area around it
to ensure that no dirt falls into the
tank.
N Position the machine so that the fuel
cap is facing up.
Never use a tool to open or close the
bayonet-type fuel cap. This may
damage the cap and cause fuel leakage.
Opening the bayonet-type fuel cap
N Press the bayonet-type fuel cap
down as far as stop, turn it
counterclockwise (about 1/8 turn)
and remove.
Filling up with fuel
Take care not to spill fuel while fueling
and do not overfill the tank. STIHL
recommends you use the STIHL filler
nozzle for fuel (special accessory).
Closing the bayonet-type fuel cap
N Place the cap on the tank opening
and turn it until it slips into position.
N Press the fuel cap down by hand as
far as stop and turn it clockwise
(about 1/8 turn) until it engages.
With the engine stopped and before
starting, check the air intakes between
the backplate and powerhead for
blockages and clean if necessary.
Positions of setting lever – BR 350
Run position F
Engine runs or is ready to start. Throttle
trigger (2) can be moved to any position.
Switch off engine †
Ignition is interrupted, engine stops. The
setting lever (1) is not locked in this
position. It springs back to the run
position F. The ignition is switched on
again.
Fueling
0002BA014 KN
2.
1.
0002BA015 KN
2.
1.
Information Before You Start
2
1
0009BA009 KN
BR 350, BR 430
English
13
Fixed throttle
The throttle trigger (2) can be locked in
any position:
To disengage the lock:
N Return the setting lever (1) to the
run position F.
Positions of setting lever – BR 430
Run position F
Engine runs or is ready to start. Throttle
trigger (2) can be moved to any position.
Switch off engine †
Ignition is interrupted, engine stops. The
setting lever (1) is not locked in this
position. It springs back to the run
position F. The ignition is switched on
again.
Lock positions C
The throttle trigger (2) can be locked in
three positions: 1/3 throttle, 2/3 throttle
and full throttle. To disengage the lock,
move the setting lever (1) back to the
normal run position F.
Starting the engine
N Observe safety precautions.
Start your unit on a clean, dust-free
surface only to ensure that no dust is
sucked in.
BR 350
BR 430
N The setting lever must be on F
2
1
0009BA010 KN
452BA122 KN
1
2
Starting / Stopping the
Engine
0009BA011 KN
0009BA021 KN
BR 350, BR 430
English
14
N Press the fuel pump bulb at least
eight times – even if the bulb is filled
with fuel.
Cold engine (cold start)
N Push the choke knob in and turn it to
c.
Warm engine (warm start)
N Push the choke knob in and turn it to
o.
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the unit securely on the
ground and make sure that
bystanders are well clear of the
nozzle outlet.
N Make sure you have a firm footing:
Hold the unit with your left hand on
the housing and put one foot against
the base plate to prevent it slipping.
N 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 to full
length – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
As soon as the engine runs
BR 350
BR 430
N Operate the throttle trigger.
N Choke knob automatically returns to
the run position e when the throttle
trigger is operated.
At very low outside temperatures
N Open throttle slightly – warm up the
engine for a short period.
0009BA012 KN
H
LA
L
0009BA013 KN
0009BA014 KN
0009BA015 KN
0009BA016 KN
0009BA022 KN
0009BA017 KN
BR 350, BR 430
English
15
Shut off the engine.
BR 350
BR 430
N Move the setting lever in the
direction of † – the engine stops –
the setting lever springs back to the
on position.
Other hints on starting
Engine stalls in cold start position c or
under acceleration
N Move the choke knob to o and
continue cranking until the engine
runs.
Engine does not start in warm start
position o
N Move the choke knob to c and
continue cranking until the engine
runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Fuel tank run until completely dry
N After refueling, press the fuel pump
bulb at least eight times – even if the
bulb is filled with fuel.
N Set the choke knob according to
engine temperature.
N Start the engine.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-ofservice periods – see "Storing the
Machine".
0009BA018 KN
0009BA023 KN
Operating Instructions
BR 350, BR 430
English
16
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power
N Turn the choke knob to c .
N Loosen the screws (1).
N Remove the filter cover (2).
N Remove the filter element (3).
N Replace dirty or damaged filters.
N Fit the new filter in the filter housing.
N Fit the filter cover.
N Insert the screws and tighten them
down firmly.
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.
Replacing the Air Filter
1
0002BA046 KN
1
2
0002BA047 KN
3
Engine Management
BR 350, BR 430
English
17
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
adjust the high speed screw within fine
limits.
Standard Setting
N To shut down the engine
N Check the air filter and replace it if
necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
N Have the spark arresting screen
(not all markets) checked – see
“Inspection and Maintenance by
Dealer"
BR 350
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 1 1/2 turns.
N Start and warm up the engine.
BR 430
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 1 turn.
N Start and warm up the engine.
Adjusting Idle Speed
Engine stops while idling
N Check the standard setting.
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Erratic idling behavior, engine stops
even though setting of LA screw has
been corrected, poor acceleration
Idle setting is too lean
N Turn the low speed screw (L) slowly
counterclockwise until the engine
runs and accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N Turn the low speed screw (L)
clockwise 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).
Fine Tuning for Operation in Mountains
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.
N Check the standard setting.
N Warm up the engine.
At high altitude
N Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
Adjusting the Carburetor
0002BA048 KN
H
LA
L
BR 350, BR 430
English
18
At sea level
N Turn high speed screw (H)
counterclockwise (richer) – no
further than stop.
N If the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
N Fit a new spark plug after about 100
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the spark plug
N Pull off the spark plug boot (1)
vertically.
N Unscrew the spark plug (2).
Checking the spark plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
caused fouling of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
If the spark plug comes with a
detachable adapter nut (1), screw the
adapter onto the thread and tighten it
down firmly to reduce the risk of arcing
and fire.
Spark Plug
2
0002BA049 KN
000BA039 KN
A
1
000BA045 KN
BR 350, BR 430
English
19
Installing the spark plug
N Screw home the spark plug, fit the
boot and press it down firmly.
If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor is properly
adjusted, the cause may be the muffler.
Have the muffler checked for
contamination (carbonization) by your
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
Replacing the Starter Rope
N Take out the screws (1).
N Remove the starter cover (2).
N Use a screwdriver or suitable pliers
to remove the spring clip (3) from
the starter post.
The rewind spring may pop out and
uncoil during this operation – take care
to avoid the risk of injury.
wear face protection and work gloves.
Engine Running Behavior Replacing the Starter Rope
and Rewind Spring
1
1
0002BA050 KN
2
1
Loading...