STIHL BG 55, 65, 85, SH 55, 85
{
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 27
F Notice d’emploi
28 - 56
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Assembling the Blower 8
Assembling the Vacuum Shredder 9
Fuel 11
Fueling 12
Starting / Stopping the Engine 12
Original Instruction ManualPrinted on chlorine-free paper
Cleaning the Air Filter 14
Engine Management 15
Adjusting the Carburetor 15
Catalytic Converter 17
Spark Plug 17
Engine Running Behavior 18
Rewind Starter 18
Storing the Machine 19
Inspections and Maintenance by
Dealer 19
Maintenance and Care 20
Main Parts 21
Specifications 24
Maintenance and Repairs 25
Printing inks contain vegetable oils, paper can be recycled.
Disposal 25
STIHL Limited Emission Control
Warranty Statement 25
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It 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 product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
{
© ANDREAS STIHL AG & Co. KG, 2014
0458-295-8221-A. VA3.K14.
0000000010_007_GB
BG 55, BG 65, BG 85, SH 55, SH 85
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
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.
Fuel tank; fuel mixture of
gasoline and engine oil
Operate manual fuel
pump
Symbols in text
WARNING
Warning where there is a risk of an
accident or personal injury or serious
damage to property.
NOTICE
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.
Safety Precautions and
Working Techniques
Special safety precau
tions must be observed
when working with a
power tool.
It is important that you
read the instruction man
ual before first use and
keep it in a safe place for
future reference. Nonobservance of the
instruction manual may
result in serious or even
fatal injury.
Observe all applicable local safety
regulations, standards and ordinances.
If you have not used this model before:
Have your dealer or other experienced
user show you how to operate your
machine or attend a special course in its
operation.
Minors should never be allowed to use
this product.
Keep bystanders, especially children,
and animals away from the work area.
When the power tool is not in use, put it
in a place where 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 unit without the
instruction manual. Be sure that anyone
using it understands the information
contained in this manual.
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-
2
BG 55, BG 65, BG 85, SH 55, SH 85
English
In some countries the operation of noise
emitting power tools is restricted by local
regulations. Observe country-specific
requirements and regulations.
Do not use a pressure washer to clean
the unit. The solid jet of water may
damage parts of the unit.
Accessories and Spare Parts
Only use parts and accessories that are
explicitly 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 unit.
STIHL recommends the use of genuine
STIHL replacement parts. They are
specifically designed to match the
product 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 this 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
power 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.
Intended Use
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.
The vacuum shredder is designed for
picking up dry leaves and other
lightweight, loose and non-combustible
materials.
Do not use your power tool for any other
purpose because of the increased risk of
accidents.
Do not operate or store your power tool
at temperatures below -10°C – exposure
to low temperatures may damage
machine components.
Personal Protective Equipment
Wear proper protective clothing and
equipment.
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,
jewellery 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 sturdy shoes with non-slip soles.
WARNING
To reduce the risk of eye
injuries, wear snug-fitting
safety glasses in accord
ance with European
Standard EN 166. Make
sure the safety glasses
are a good fit.
Wear hearing protection, e.g. earplugs
or ear muffs.
Transporting the Unit
Always stop the engine.
Transporting in a vehicle:
– Properly secure your power tool to
prevent turnover, fuel spillage and
damage.
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-
-
BG 55, BG 65, BG 85, SH 55, SH 85
3
English
Fueling
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
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.
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.
This reduces the risk of unit vibrations
causing the fuel cap to loosen or come
off and spill quantities of fuel.
Before Starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manual.
– Check the fuel system for leaks,
paying special attention to visible
parts such as the tank cap, hose
connections and the manual fuel
pump (on machines so equipped). If
there are any leaks or damage, do
not start the engine – risk of fire.
Have your machine repaired by a
servicing dealer before using it
again.
– Throttle trigger must move freely
and spring back to the idle position
when released.
– Stop switch must move easily to 0
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Check condition of blower wheel
and blower housing – see chapter
on "Using the Unit".
– A worn blower housing (cracks,
nicks, chips) may result in an
increased risk of injury from thrown
foreign objects.
– If either the blower wheel or blower
housing is damaged, consult your
dealer – STIHL recommends you
contact a STIHL servicing dealer.
– Never attempt to modify the controls
or safety devices in any way.
To reduce the risk of accidents, do not
operate the unit if it is not properly
assembled and in good condition.
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 the power tool – start
the engine as 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.
During Operation
Do not direct the air blast towards
bystanders or animals since the air flow
can blow small objects at great speed.
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the stop switch
to 0.
To reduce the risk
of injury from
thrown objects, do
not allow any other
persons within a
radius of 5 meters
of your own
position.
4
BG 55, BG 65, BG 85, SH 55, SH 85
English
295BA052 KN
Never leave a running machine
unattended.
Take special care in slippery conditions,
on slopes or uneven ground.
Watch out for obstacles such as 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.
To reduce the risk of accidents, take a
break in good time to avoid tiredness or
exhaustion.
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert so as not to endanger
others.
When blow-sweeping and vacuum
shredding (in open ground and
gardens), watch out for small animals to
avoid harming them.
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).
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 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.
The dust that occurs during operation
may be harmful to health. If dust levels
are very high, wear a suitable respirator.
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 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, consult your servicing dealer.
Using the Blower
Your blower is designed for one-handed
operation. It must be carried by the
control handle in the right hand.
Always hold the power tool firmly in your
hand.
Watch out for small animals when using
the blower on open ground, in yards and
gardens.
Walk slowly forwards as you work –
observe the nozzle outlet at all times –
do not walk backwards – risk of
stumbling.
WARNING
To reduce the risk of injury, operate the
unit only with a properly mounted blower
tube.
The round nozzle is particularly suitable
for use on uneven surfaces (e.g. fields
and lawns).
The fan nozzle (either included with
power tool or available as special
accessory) produces a broad and
powerful airstream at ground level. It can
BG 55, BG 65, BG 85, SH 55, SH 85
5
English
295BA053 KN
be aimed and controlled very accurately.
This nozzle is highly effective for blowsweeping sawdust, leaves, grass
cuttings, etc. on flat surfaces.
Using the Vacuum Attachment
For specific assembling instructions,
see appropriate chapter in this manual.
Your vacuum shredder is designed for
two-handed operation. Hold and operate
the unit with your right hand on the
control handle and your left hand on the
assist handle.
Wear the catcher bag shoulder strap
over your left shoulder, not across your
chest. This enables you to quickly
remove the power tool and catcher bag
in an emergency.
WARNING
To reduce the risk of injury, operate your
power tool only with a properly mounted
suction tube and closed catcher bag.
NOTICE
Vacuuming abrasive material (such as
grit, stone chips, etc.) causes the blower
wheel and blower housing to wear at a
rapid rate. This results in a considerable
loss of suction power. In such a case
you should contact your dealer. STIHL
recommends an authorized STIHL
servicing dealer.
Take particular care when vacuuming
wet leaves since they may block the
blower wheel and elbow.
Watch out for small animals when using
the vacuum on open ground, in yards
and gardens.
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.
Switch off the
engine before
opening the intake
screen. The intake
screen must
always be closed
and secured when
the suction tube is
not mounted to
reduce the risk of
injury from con
-
tact with rotating
components. This
can also result in
damage to the
engine.
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6
BG 55, BG 65, BG 85, SH 55, SH 85
English
Working Technique
To minimize blowing time, use a rake
and broom to loosen dirt particles before
you start blowing.
Recommended working technique to
minimize air pollution:
– If necessary, dampen the surface to
be cleaned in order to avoid creating
too much dust.
– Do not blow particles in the direction
of bystanders, in particular in the
direction of children, pets, open
windows or freshly washed
vehicles. Take special care in such
situations.
– Remove the blow-swept debris in
rubbish bins – do not blow it onto the
neighbor's land.
Recommended working technique to
minimize noise:
– Operate your power tool at
reasonable times only – not early in
the morning, late at night or during
midday rest periods when people
could be disturbed. Observe local
rest periods.
– Operate blowers at the lowest
engine speed necessary to
accomplish the task.
– Check your blower before starting
work. Pay special attention to the
muffler, air intakes and air filter.
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 original
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.
BG 55, BG 65, BG 85, SH 55, SH 85
7
English
3
2
295BA003 KN
1
1
5
4
295BA004 KN
a
b
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.
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.
Assembling the Blower
Mounting the Blower Tube
N Push the nozzle (4) onto the blower
tube (1) as far as lug (5),
position (a) (long) or position (b)
(short), and rotate the nozzle in the
direction of the arrow to it lock in
position.
N Push t he blower tube (1) with lug (2)
into the fan housing stub (3) and
rotate it in the direction of the arrow
to lock in position.
8
BG 55, BG 65, BG 85, SH 55, SH 85
English
6
295BA005 KN
3
1
2
295BA006 KN
3
1
2
295BA007 KN
4
295BA037 KN
Removing the Blower Tube
N Use a suitable tool to lift the tab (6)
on the fan housing stub (3).
N Rotate the blower tube in the
direction of the arrow and then pull it
out.
See "Assembling the Vacuum Shredder"
for installation and removal of the
vacuum attachment.
Assembling the Vacuum
Shredder
The vacuum attachment is available as
a special accessory.
Fitting the Elbow
N From inside the catcher bag (2),
push the elbow (1) through the
intake opening and pull it outwards
until it is firmly seated.
N Attach the carrying strap.
N Push the elbow (1) into the catcher
bag (2) as far as the mark and
secure it with the Velcro strip (3).
N Loosen the screw (4).
BG 55, BG 65, BG 85, SH 55, SH 85
9
English
5
295BA038 KN
1
6
8
7
295BA039 KN
10
11
11
11
9
9
9
295BA040 KN
4
295BA037 KN
7
295BA041 KN
6
N Push the elbow (1) with lug (5) into
the fan housing stub (6) and rotate it
in the dir ection of the arrow to lock in
position.
N Tighten down the screw (4) firmly.
N Use a suitable tool to disengage the
tab (7) on the intake screen (8) and
then open the intake screen.
N Use a suitable tool to lift the tab (7)
N on the fan housing stub (6).
N Rotate the elbow in the direction of
the arrow and then pull it out.
N Tighten down the screw (4) firmly.
N Push guideways (9) on suction
tube (10) onto lugs (11) on fan
housing and
N rotate suction tube in direction of
arrow to lock it in position.
Removing the Elbow
N Loosen the screw (4).
10
BG 55, BG 65, BG 85, SH 55, SH 85
English
Fuel
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 (R+M)/2.
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 30 days of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
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)
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
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BG 55, BG 65, BG 85, SH 55, SH 85
11
English
295BA033 KN
295BA034 KN
3
2
1
295BA013 KN
Fueling
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 cap.
N Fill up with fuel.
N Close the cap.
WARNING
After fueling, tighten down the filler cap
as securely as possible by hand.
Changing the Fuel Pickup Body
Change the fuel pickup body every year:
N Drain the fuel tank.
N Use a hook to pull the fuel pickup
body out of the tank and take it off
the hose.
N Push the new pickup body into the
hose.
N Place the pickup body in the tank.
Starting / Stopping the
Engine
Starting the Engine
N Observe safety precautions.
BG 55, 65, SH 55
N Move the stop switch (1) to the run
position I.
N Squeeze the throttle trigger (2) and
press in the lockout button (3) at the
same time.
N Release the throttle trigger.
N Release the lockout button – this is
the starting throttle position.
The lockout button can be used to lock
the throttle trigger in the full throttle
position during operation.
12
BG 55, BG 65, BG 85, SH 55, SH 85
English
4
1
2
295BA031 KN
6
295BA018 KN
295BA043 KN
5
295BA016 KN
BG 85, SH 85
N Move the stop switch (1) to the run
position I.
N Squeeze the throttle trigger (2) and
move the setting lever (4) to midway
position at the same time.
N Release the throttle trigger – this is
the starting throttle position.
The setting lever enables you to select
and hold any throttle position between
idle and full throttle. Move the setting
lever to the idle position before shutting
off the engine.
All models
Setting the choke lever
N Press the manual fuel pump
bulb (6) at least five times – even if
the bulb is filled with fuel.
If the engine is cold
N Set the choke lever (5) to g.
N Pull the starter rope five times.
N Set the choke lever (5) to e.
N Continue cranking until the engine
runs.
If the engine is warm
N Set the choke lever (5) to e.
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the unit on the ground so that
it is secure.
N Make sure you have a firm footing:
Hold the unit firmly with your left
hand on the housing and press
down.
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.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
BG 55, BG 65, BG 85, SH 55, SH 85
13
English
6
295BA018 KN
1
295BA019 KN
2
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
As Soon as Engine Runs
BG 55, 65, SH 55
N Blip the throttle trigger so that the
lockout button pops out – the engine
settles down to idle speed.
BG 85, SH 85
N Move the setting level forwards to
end position.
Stopping the Engine
N Move the stop switch to 0.
Other Hints on Starting
If the engine stops during warm-up or
acceleration
N Repeat the starting procedure – see
"If the engine is cold".
If the engine does not start
N Make sure all settings are correct
(choke shutter, throttle trigger in
starting throttle position, stop switch
to I).
N Repeat the starting procedure.
If the engine still does not start
N Move the stop switch to 0.
N Remove the spark plug – see
"Spark Plug".
N Dry the spark plug.
N Crank the engine several times with
the starter to clear the combustion
chamber.
N Refit the spark plug – see "Spark
Plug".
N Move the stop switch to I.
N Set the choke lever to e – even if
the engine is cold.
N Now start the engine.
If fuel tank has been run completely dry
and then refueled
N Press the manual fuel pump
bulb (6) at least five times – even if
the bulb is filled with fuel.
N Set the choke lever according to
engine temperature.
N Start the engine.
Cleaning the Air Filter
If there is a noticeable loss of engine
power
N Move the choke lever to g
N Squeeze the tabs (1) together.
N Swing the filter cover (2) open and
take it away.
N Clean away loose dirt from around
the filter.
14
BG 55, BG 65, BG 85, SH 55, SH 85
4
295BA046 KN
3
Engine Management Adjusting the Carburetor
English
N Take the filter (3) out of the filter
housing (4).
N 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.
N Fit the filter (3) in the filter
housing (4).
N Fit the filter cover (2) so that it snaps
into position.
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.
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
N Shut off the engine.
N Check the air filter and clean or
replace if necessary.
N Check the spark arresting screen
(not in all models, country-specific)
in the muffler and clean or replace if
necessary.
BG 55, BG 65, BG 85, SH 55, SH 85
15
English
295BA085 KN
295BA086 KN
Standard Setting
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
clockwise as far as stop, then turn it
back 3/4 turn.
Adjusting Idle Speed
N Carry out the standard setting.
N Start and warm up the engine.
Engine stops while idling
N Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly – then back it off a 1/4 turn
from that position.
Erratic idling behavior, poor acceleration
(despite correction to setting of LA
screw).
Idle setting is too lean
N Turn the low speed screw (L)
carefully counterclockwise, no
further than stop, until the engine
runs smoothly and accelerates well.
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 at High
Altitude
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
N Carry out the standard setting.
N Warm up the engine.
N Turn high speed screw (H) slightly
clockwise (leaner) – no further than
stop.
NOTICE
After returning from high altitude, reset
the carburetor to the standard setting.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
16
Erratic idling behavior, engine speed
drops when swinging the machine
Idle setting is too rich
N Turn the low speed screw (L) slowly
clockwise until the engine runs and
accelerates smoothly.
BG 55, BG 65, BG 85, SH 55, SH 85
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