{
STIHL BR 380
Instruction Manual
Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2011
0458-453-0121-A. VA1.L11.
0000000747_001_GB
BR 380
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
Fuel 9
Fueling 11
Information Before You Start 11
Starting / Stopping the Engine 12
Operating Instructions 14
Cleaning the Air Filter 14
Adjusting the Carburetor 15
Catalytic Converter 16
Checking the Spark Plug 16
Engine Running Behavior 17
Spark Arresting Screen in Muffler 18
Replacing the Starter Rope and
Rewind Spring 18
Storing the Machine 21
Maintenance and Care 22
Minimize Wear and Avoid Damage 24
Parts Subject to Wear and Tear 24
Main Parts 25
Specifications 26
Special Accessories 27
Maintenance and Repairs 27
EC Declaration of Conformity 27
Quality Certification 28
BR 380
English
2
Pictograms
All the pictograms attached to the
machine are shown and explained in this
manual.
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.
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.
Guide to Using this Manual 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. Non-
observance of the safety
precautions may result in
serious or even fatal
injury.
BR 380
English
3
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 blow-
sweeping 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.
It must not be used 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.
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 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 well-
ventilated areas. If you spill fuel, wipe
the machine immediately – if fuel gets on
your clothing, change immediately.
This reduces the risk of unit vibrations
causing the fuel cap to loosen or come
off and spill quantities of fuel.
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.
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.
After fueling, tighten
down the screw-type fuel
cap as securely as
possible.
BR 380
English
4
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 impeller
housing.
A worn impeller housing (cracks, nicks,
chips) may result in an increased risk of
injury from thrown foreign objects. If the
impeller 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.
Start 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 unit on level ground, make
sure you have secure footing, hold the
unit securely.
As soon as the engine starts, the air flow
may throw small objects (e.g. stones) in
your direction.
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 – even
if you are left-handed.
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 power tool 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.
373BA005 KN
BR 380
English
5
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,
on slopes or 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.
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).
Mufflers with a catalytic converter can
become particularly hot.
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.
Using the vacuum attachment
*
Watch out for small animals when
vacuuming in open areas, yards and
gardens.
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.
To reduce the risk of per
-
sonal injury from fire,
never attempt to pick up
hot or burning sub
-
stances (e.g. smoldering
ashes, glowing
cigarettes).
To reduce the risk of fatal
injury from fire or explo
-
sion, never attempt to
pick up combustible fluids
(e.g. gasoline) or materi
-
als soaked in
combustible fluids.
BR 380
English
6
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:
– Hand protection (wearing warm
gloves)
– Work breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, tingling
sensations).
– Low outside temperatures.
– The force with which the handles
are held (a tight grip restricts
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 unless the slide control /
stop switch is on STOP or 0 since there
is otherwise a risk of fire from
uncontained sparking.
To reduce the risk of fire, 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.
*
Special accessory
BR 380
English
7
Mounting the Elbow
A combination wrench and carburetor
screwdriver are stowed on the underside
of the blower.
The throttle cable is already connected
and must not be kinked during
assembly.
N Push the elbow (1) into the stub (2)
as far as it will go – the stops on the
elbow and stub must line up.
N Fit the nut (3) in the hexagon recess
in the stub.
N Insert the screw in the nut from the
other side and tighten moderately –
the elbow must still turn.
Assembling the Unit
353BA002 KN
2
3
1
BR 380
English
8
Mounting the Blower Tube
Operate the machine only with the
blower tube and nozzle properly
mounted.
N Attach the throttle cable (4) to the
retainer (5).
N Push the blower tube (6) into the
pleated hose (7).
N Push blower tube (8) onto the end of
the blower tube (6) and rotate it
clockwise until the bayonet coupling
locks.
N Push the nozzle (9) onto the blower
tube (8) and rotate it clockwise until
the bayonet coupling locks.
N Rotate the pleated hose (7)
counterclockwise as far as stop and
leave it in that position.
N Turn the control handle (10)
counterclockwise to the horizontal
position.
N Rotate the complete blower tube
assembly until the nozzle discharge
opening points in the same direction
as the control handle.
N Tighten down the clamp screw (11)
firmly.
373BA001 KN
8
7
4
9
10
6
11
5
BR 380
English
9
Adjusting the Control Handle
N Put the unit on your back.
N Loosen the clamp screw (11).
N Slide the control handle (10) along
the tube to the most comfortable
position.
N Tighten down the clamp screw (11)
firmly.
Adjusting the Harness Straps
N Pull the ends of the straps
downward to tighten the harness.
Loosening the Harness Straps
N Lift the tabs of the sliding adjusters.
N Adjust the straps so that the
backplate is held firmly and
comfortably against your back.
The engine requires a mixture of
gasoline and engine oil.
Avoid direct skin contact with and
breathing in of gasoline fumes.
STIHL MotoMix
STIHL recommends using STIHL
MotoMix. This pre-blended fuel is free of
benzene and lead, stands out because
of a high octane rating, and always
provides the proper mixing ratio.
STIHL MotoMix is specially engineered
for STIHL engines and guarantees long
engine life.
MotoMix is not available in all markets.
Mixing fuel
Unsuitable fuels or a mixing ratio that
deviates from the specification can lead
to severe engine damage. The engine,
seals, fuel lines and fuel tank may be
damaged if poor quality gasoline or
engine oil is used.
Gasoline
Use only high-quality gasoline with an
octane rating of at least 90 ROC –
leaded or unleaded.
Unleaded gasoline must be used in
machines equipped with a catalytic
converter.
11
10
373BA002 KN
373BA003 KN
373BA004 KN
Fuel
BR 380
English
10
Using multiple tankfuls of leaded
gasoline can substantially reduce the
effectiveness of the catalytic converter.
Gasoline with an alcohol component
exceeding 10% can cause impaired
engine performance in engines with
manually adjustable carburetors and
thus should not be used in these
engines.
Engines with M-Tronic deliver full engine
performance using gasoline with an
alcohol component of up to 25% (E25).
Engine oil
Use only high-quality two-stroke engine
oil – preferably STIHL two-stroke engine
oil, as this is specially engineered for
STIHL engines and guarantees long
engine life.
If STIHL two-stroke engine oil is
unavailable, use only two-stroke engine
oil for air-cooled engines – do not use
engine oil for water-cooled engines or
engines with a separate oil circuit (e.g.,
conventional four-stroke engines).
Only STIHL two-cycle engine oil 1:50
may be used to produce the fuel mixture
for machines with a catalytic converter.
Mixing ratio
with STIHL two-cycle engine oil 1:50;
1:50 = 1 part oil + 50 parts gasoline
Examples
N Pour oil into an approved safety fuel
canister first, then add gasoline and
mix thoroughly
Storing fuel mixture
Store in approved safety fuel canisters
only in a dry, cool and secure place
protected against light and sunlight.
Fuel mixture ages – mix only as much as
needed for a few weeks. Do not store
fuel mixture for longer than
three months. The fuel mixture can
become unusable faster if exposed to
light, sunlight or low or high
temperatures.
N Shake the canister containing the
fuel mixture thoroughly before
refueling
Pressure can build up inside the canister
– open carefully.
N The fuel tank and the canister in
which fuel mixture is stored should
be cleaned thoroughly from time to
time
Residual fuel and the liquid used for
cleaning must be disposed of in
accordance with regulations and without
harming the environment!
Quantity of
gasoline
STIHL two-cycle engine
oil 1:50
Liters Liters (ml)
10.02(20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
BR 380
English
11
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
filler cap is facing up.
STIHL recommends you use the STIHL
filler nozzle for fuel (special accessory).
Filling up with fuel
Take care not to spill fuel while fueling
and do not overfill the tank.
N Open the filler cap.
N Fill up with fuel.
N Close the filler cap.
After fueling, tighten down the filler cap
as securely as possible by hand.
With the engine stopped and before
starting, check the air intake grille
between the backplate and powerhead
for blockages and clean if necessary. A
protective screen is available as a
special accessory to keep the air intake
clear.
N Move the setting lever to the idel
position.
The throttle cable disconnects itself from
the throttle trigger if the engine is not
shut off in the idle position.
The throttle cable reconnects itself
automatically when the setting lever is
moved to the idle position.
Fueling
373BA006 KN
Information Before You Start
373BA037 KN
BR 380
English
12
Starting the engine
N Observe safety precautions.
N Slide the stop switch (1) to #
N Move setting lever (2) to center
position – starting throttle.
The setting lever enables you to select
and hold any throttle position between
(lower stop) idle and full throttle (upper
stop).
Set the lever to the idle position before
switching off the engine.
If the engine is cold
N Turn the choke knob to g.
If the engine is warm
N Turn the choke knob to e.
N Also use this setting if the engine
has been running but is still cold.
Starting
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 Hold the starter grip with your right
hand.
N Pull the starter grip slowly 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.
Starting / Stopping the
Engine
373BA008 KN
1
373BA009 KN
2
373BA010 KN
373BA011 KN
373BA012 KN
BR 380
English
13
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
When the engine begins to fire:
If the engine is cold:
N Move the choke knob to e and
continue cranking until the engine
runs.
If the engine is warm:
N Continue cranking until the engine
runs.
As soon as the engine runs
N Move setting lever (2) to lower stop
– the engine settles down to idle
speed.
To shut down the engine
N Slide the stop switch (1) to $ .
Other hints on starting
At very low outside temperatures
N Warm up the engine.
As soon as the engine runs:
N Move setting lever to lower stop –
the engine settles down to idle
speed.
N Open throttle slightly – warm up the
engine for a short period.
If the engine does not start
If you did not turn the choke knob to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
N Pull off the spark plug boot.
N Unscrew and dry off the spark plug.
N Move the stop switch to 0.
N Open the throttle wide.
N Crank the engine several times with
the starter to clear the combustion
chamber.
N Refit the spark plug and connect the
spark plug boot.
N Slide the stop switch to # and set
the choke knob to e – even if the
engine is cold.
N Now start the engine.
373BA013 KN
373BA014 KN
2
1
373BA015 KN
373BA016 KN
BR 380
English
14
If fuel tank has been run completely dry
and then refueled
N Pull the starter rope several times to
prime the fuel system.
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 engine-
mounted 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-of-
service periods – see "Storing the
Machine".
If there is a noticeable loss of engine
power
N Turn the choke knob to g.
N Take out the screw (1) and remove
the filter cover (2).
Operating Instructions Cleaning the Air Filter
1
373BA017 KN
2
1
BR 380
English
15
N Remove the main filter (3) from the
cover and inspect it – if it is dirty or
damaged, fit a new one.
Always install a new prefilter together
with the new main filter.
N Take the prefilter (4) out of the filter
cover.
N If prefilter is wet, dry it – then knock
it out on the palm of your hand or
blow it out with compressed air.
Always replace a damaged prefilter.
N Clean loose dirt from the filter cover
and filter chamber.
N Install the main filter (3) and
prefilter (4) in the filter cover.
N Fit the cover on the filter base (5)
and tighten it down firmly.
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 and low speed
screws within fine limits.
Standard Setting
N Stopping the engine
N Check the air filter and clean or
replace as necessary.
N Check the spark arresting screen
(not in all versions) in the muffler
and clean or replace as necessary.
N Carefully turn both adjusting screws
counterclockwise as far as stop.
N The high speed screw (H) is 1/4 turn
open.
N The low speed screw (L) is 1/4 turn
open.
N Start and warm up the engine.
Adjusting Idle Speed
Engine stops while idling
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)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N Turn the low speed screw (L)
clockwise, no further than stop, 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).
373BA018 KN
3
4
5
Adjusting the Carburetor
H
L
373BA043 KN
LA
L
373BA044 KN
BR 380
English
16
Fine tuning for operation at high altitude
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
N Check the standard setting.
N Warm up the engine.
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.
Power tools with a catalytic converter
(depending on model) must be run on a
50 : 1 mixture of unleaded gasoline and
STIHL two-stroke engine oil or
equivalent two-stroke engine oil – see
chapter on "Fuel".
The catayltic converter integrated in the
muffler reduces the harmful emissions in
the exhaust gas.
The correct carburetor setting (if
adjustable) and strict observance of the
prescribed mix ratio of gasoline and two-
stroke engine oil are essential to
minimize harmful emissions and ensure
a long catalytic converter service life.
If the engine is down on power, difficult
to start or runs poorly at idle speed, first
check the spark plug.
N Remove the spark plug – see
"Starting / Stopping the Engine".
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.
Catalytic Converter Checking the Spark Plug
000BA002 KN
BR 380
English
17
N Install 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".
To reduce the risk of arcing and fire
If the spark plug comes with a
detachable adapter nut:
N Screw the adapter nut (1) onto the
thread and tighten it down firmly.
On all spark plugs
N Always press the boot (2) firmly on
to the spark plug (3).
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.
1
000BA045 KN
3
000BA050 KN
2
Engine Running Behavior
BR 380
English
18
If the engine is down on power or does
not run smoothly at maximum RPM,
check the spark arresting screen (not
fitted in all versions) in the muffler.
Wait for the engine to cool down
completely before performing this work.
N Use suitable tool to squeeze ends of
clip (1) together and then lift the clip
away.
N Pull the spark arresting screen (2)
out of the muffler.
N Clean the spark arresting screen if
necessary.
N If the spark arresting screen is
damaged or heavily carbonized, fit a
new one.
Replacing the starter rope
N Take out the screws (1).
N Remove the starter cover (2) from
the housing.
N Remove the spring clip (3).
N Remove the rope rotor with
washer (4) and pawl (5).
Spark Arresting Screen in
Muffler
373BA031 KN
1
2
Replacing the Starter Rope
and Rewind Spring
1
1
1
373BA025 KN
2
1
353BA034 KN
3
5
4
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