Stihl BG 55 User manual

Instruction ManualSTIHL BG 55, 65, 85, SH 55, 85
BA_BG55_01_U_H3.book Seite 0 Montag, 16. Juni 2003 12:19 12
STIH)
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1BG 55, BG 65, BG 85, SH 55, SH 85
English
BA_SE_001_003_01_12.fmPrinted on chlorine-free paper.
Printing inks contain vegetable oils; paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2007 0458 295 0121. M10. E7. FST. Printed in Germany
STIHl
Contents
Guide to Using this Manual .............. 2
Safety Precautions ........................... 3
Using the Blower .............................. 8
Using the Vacuum Shredder ............. 8
Assembling the Blower ..................... 9
Assembling
the Vacuum Shredder ..................... 10
Fuel ................................................ 12
Fueling ............................................ 13
Starting / Stopping the Engine ........ 14
Cleaning the Air Filter ..................... 17
Adjusting the Carburetor ................ 17
Catalytic Converter ......................... 19
Checking the Spark Plug ................ 20
Engine Running Behavior ............... 21
Rewind Starter ................................ 21
Storing the Machine ........................ 21
Maintenance Chart ......................... 22
Minimize Wear and
Avoid Damage ................................ 23
Parts and Controls .......................... 24
Specifications ................................. 26
Special Accessories ....................... 28
Maintenance and Repairs ............... 28
Certificate of Conformity ................. 29
Quality Certification ........................ 30
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.
Hans Peter Stihl
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2
English
BG 55, BG 65, BG 85, SH 55, SH 85
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
:A bullet marks a step or procedure
without direct reference to an
illustration.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Caution where there is a risk of
damaging the machine or its
individual components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s under-
standing of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual may refer to
several models with different
features. Components that are not
installed on all models and related
applications are marked with an
asterisk (*). Such components may
be available as special accessories
from your STIHL dealer.
Engineering improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore some changes, modifications
and improvements may not be covered
in this manual.
Guide to Using this Manual
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3BG 55, BG 65, BG 85, SH 55, SH 85
English
Special safety
precautions must be
observed when working
with the power tool.
It is important that you
read, fully understand and
observe the following
safety precautions and
warnings.
Careless or improper use of any blower
may cause serious or fatal injury.
Observe all applicable local safety
regulations, standards and ordinances.
If you have never used this type of
power tool before:
Have your STIHL dealer or other
experienced user show you how to
operate your blower.
Minors should never be allowed to use a
blower.
Bystanders, especially children, and
animals should not be allowed in the
area where a blower is in use.
The operator is responsible for avoiding
injury to third parties and damage to
their property.
Do not lend or rent your blower without
the owner's manual. Be sure that
anyone using your blower understands
the information contained in this manual.
You must be rested, healthy and in good
physical condition to operate a power
tool.
Do not operate the blower if you
are under the influence of any substance
(drugs, alcohol, etc.) which might impair
vision, dexterity or judgment.
Attachments
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with your specific model are authorized.
Other attachments must not be used
because of the increased risk of
accidents.
STIHL excludes all liability for personal
injury and damage to property caused
while using unauthorized attachments.
Clothing and Equipment
Wear proper clothing and equipment.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement – an overall
and jacket combination is
recommended.
Avoid loose-fitting jackets,
scarves, neckties, jewelry
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 steel-toed safety
boots with nonslip soles.
Wear safety glasses,
goggles or a face shield
to reduce the risk of injury
from thrown objects.
Safety Precautions
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4
English
BG 55, BG 65, BG 85, SH 55, SH 85
Wear sound barriers (ear plugs or ear
mufflers) to protect your hearing.
Wear heavy-duty
gloves, preferably made
of chrome leather.
Fueling
Gasoline is an
extremely flammable
fuel. Do not smoke or
bring any fire or flame
near the fuel.
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
Remove the fuel filler cap on the unit
carefully so as to allow any pressure
build-up in the tank to release slowly.
Fuel your blower in well-ventilated
areas, outdoors only. Wipe off any
spilled fuel before starting and check for
leakage. Take care not to get fuel on
your clothing. If this happens, change
immediately.
Tighten down the 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.
To reduce the risk of serious or fatal
burn injuries, check for fuel leakage
while refueling and during operation. If
fuel leakage is found, do not start or run
the engine until leak is fixed.
Store gasoline and oil in properly
labeled, approved safety-type cans.
Transporting the Unit
Always stop the engine.
Transporting in a vehicle:
Properly secure your unit to prevent
turnover, fuel spillage and damage.
When the unit is not in use (work break),
put it down so that it does not endanger
others.
Before Starting
Check that your power tool is properly
assembled and in good condition –
refer to the appropriate chapters in the
instruction manual:
– Throttle trigger must move freely
and spring back to idle position
when released.
– Stop switch must move easily to 0
– Check that spark plug boot is secure
– a loose boot may cause arcing
that could ignite combustible fumes
and cause a fire.
– Check condition of fanwheel and
fan housing (see chapter on "Using
the Vacuum Shredder").
– A worn fan housing (cracks, nicks,
chipping) may result in an increased
risk of injury from escaping foreign
matter.
– If either the fanwheel or the fan
housing are damaged, contact your
STIHL dealer for assistance.
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5BG 55, BG 65, BG 85, SH 55, SH 85
English
Never attempt to modify the controls or
the safety devices in any way.
To reduce the risk of accidents, never
operate your power tool if it is damaged,
improperly adjusted or not completely or
securely assembled.
Starting the Engine
Start the engine at least 3 meters from
the fueling spot, outdoors only. Place the
unit on firm level ground in an open area.
Make sure you have good balance and
secure footing.
Hold the unit securely.
Your power tool is a one-person unit. Do
not allow other persons within a radius of
5 meters of your own position – even
when starting.
Start the engine as described in the
instruction manual.
During Operation
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These gases
(e.g. carbon monoxide)
may be colorless and
odorless. To reduce the risk of serious or
fatal injury from breathing toxic fumes,
never run the engine indoors or in poorly
ventilated locations.
Ensure proper ventilation when working
in trenches, hollows or other confined
areas.
Take a break in good time to avoid
tiredness or exhaustion.
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.
Do not work alone –
keep within calling distance of others in
case help is needed.
General Precautions
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Always hold your unit firmly – make sure
you always have a firm and secure
footing.
Examine the work area: Do not direct
the air blast towards bystanders
since the air flow can blow small objects
at great speed.
Work calmly and carefully –
under good visibility and daylight
conditions only. Stay alert so as not to
endanger others.
326BA000 LA
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6
English
BG 55, BG 65, BG 85, SH 55, SH 85
Operate your power tool only in the
areas specified in the instruction
manual.
Operate your power tool so that it
causes a minimum of noise and
emissions. Do not run the engine
unnecessarily. Accelerate the engine
only when working.
Take care in slippery conditions on ice,
in wet or snow, on slopes or uneven
ground.
Watch out for obstacles:
Roots, ditches, holes or rubbish which
could cause you to trip or stumble.
When your power tool is not in use, put
it down in a safe place so that it does not
endanger others.
Always shut off the engine before
leaving your power tool unattended. Using the Vacuum Attachment*
For specific assembling instructions,
see the appropriate chapter of this
instruction manual
The catcher bag must always be
mounted to the unit when you use the
unit in the vacuum mode. Hold the unit
firmly at all times with both hands on the
two handles. Wear the shoulder strap
over your left shoulder – not across your
chest.
* see “Guide to Using this Manual”
To reduce the risk of
personal injury from fire,
never attempt to pick up
hot or burning substances
(e.g. smoldering ashes,
glowing cigarettes).
To reduce the risk of fatal
injury from fire or
explosion, never attempt
to pick up combustible
fluids (e.g. gasoline) or
any materials soaked in
combustible fluids
Move the stop
switch to "0"
before opening
the intake screen.
In order to reduce the risk of injury from
contact with rotating parts and damage
to the motor, the intake screen must
always be closed and secured in place
when the suction tube is not mounted.
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7BG 55, BG 65, BG 85, SH 55, SH 85
English
Vibrations
Prolonged use of the unit 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)
– 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, seek medical advice.
Maintenance and repairs
The machine must be serviced regularly.
Do not attempt any maintenance or
repair work not described in your
Owner’s Manual. All other work should
be carried out by a servicing dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
Use only high-quality replacement parts,
in order to avoid the risk of accidents or
damage to the machine. Contact a
dealer if in doubt.
STIHL recommends the use of genuine
STIHL spare parts. Such parts have
been optimized for the machine and the
user's requirements.
Before starting any maintenance or
repair work and before cleaning the
machine, always stop the engine and
disconnect the spark plug boot to
avoid all risk of injury if the engine
starts up inadvertently. – Exception:
adjustment of carburetor and idle speed.
Do not service or store the machine near
a naked light – risk of fire due to the
fuel.
Check fuel cap regularly for tightness.
Use only the spark plugs approved by
STIHL – see Specifications.
Inspect ignition lead (insulation in good
condition, secure connection).
To reduce the risk of fire due to ignition
outside the cylinder, move the slide
control / stop switch to STOP or 0before
turning the engine over on the starter
with the spark plug boot removed or the
spark plug unscrewed.
Check that the muffler is in perfect
working condition.
Do not use the machine if the muffler is
damaged or missing – risk of fire! –
Hearing damage!
Do not touch the hot muffler – risk of
burns!
The condition of the anti-vibration
buffers influences the machine's
vibrations – they must be examined
regularly.
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8
English
BG 55, BG 65, BG 85, SH 55, SH 85
Your blower is designed for one-handed
operation. It can be carried by the
control handle in either the right or left
hand.
The round nozzle* is particularly suitable
for use on uneven surfaces (e.g. fields
and lawns).
The fan nozzle* produces a broad and
powerful airstream at ground level. It can
be aimed and controlled very accurately.
This nozzle is highly effective for blow-
sweeping sawdust, leaves, grass
cuttings, etc. on flat surfaces.
Watch out for small animals when
using the blower on open ground, in
yards and gardens.
* see “Guide to Using 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 shoulder strap* for the catcher
bag* over your left shoulder – not across
your chest.
The large diameter suction tube*
enables the unit to pick up all kinds of
trash, such as large leaves, cardboard
and pieces of bark.
* see “Guide to Using this Manual”
Vacuuming abrasive material (such
as grit, stone chips, etc.) causes the
fanwheel and fan housing to wear at
a rapid rate. This results in a
considerable loss of suction power.
In such a case you should contact
your STIHL dealer.
Take particular care when
vacuuming wet leaves since they
may block the fan.
Watch out for small animals when
vacuuming and blowing in open
areas and gardens. To help avoid
the risk of injuring animals, do not
run the unit at high engine speed.
Using the Blower
326BA033 LA
Using the Vacuum Shredde
r
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9BG 55, BG 65, BG 85, SH 55, SH 85
English
:Push the 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.
:Push nozzle (4) onto the blower
tube (1) as far as lug (5), position a
(long) or position b(short), and
rotate it in the direction of the arrow
to lock in position.
Removing blower tube
:Use a suitable tool to lift the
tab (6) on the fan housing stub (3).
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 vacuum
attachment.
* see “Guide to Using this Manual”
Assembling the Blower
3
2
295BA003 KN
1
1
5
4
295BA004 KN
ab
6
295BA005 KN
3
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10
English
BG 55, BG 65, BG 85, SH 55, SH 85
:From inside the catcher bag* (2),
push the elbow* (1) through the
intake opening (see arrow) and pull
it outwards until it is firmly seated.
:Attach the carrying strap*.
* see “Guide to Using this Manual”
:Push elbow (1) into the catcher
bag (2) as far as mark (see arrow)
and secure it with the Velcro
strip* (3).
* see “Guide to Using this Manual”
:Loosen the screw (4).
:Push elbow (1) with lug (5) into
fan housing stub (6) and rotate in
direction of arrow to lock in position.
:Tighten down the screw (4).
Assembling the Vacuum
Shredder
1
2
295BA006 KN
3
1
2
295BA007 KN
4
295BA037 KN
5
295BA038 KN
1
6
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11BG 55, BG 65, BG 85, SH 55, SH 85
English
:Use a suitable tool to disengage the
tab (7) on the intake screen (8) and
then open the intake screen.
:Push guideways (9) on suction
tube* (10) onto lugs (11) on fan
housing and rotate suction tube
in direction of arrow to lock it in
position.
* see “Guide to Using this Manual”
Removing the elbow
:Loosen the screw (4).
:Use a suitable tool to lift the
tab (7) on the fan housing stub (6).
Rotate the blower tube or elbow in
the direction of the arrow and then
pull it out.
:Tighten down the screw (4).
8
7
295BA039 KN
1
0
11 11
11
9
9
9
295BA040 KN
4
295BA037 KN
7
295BA041 KN
6
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12
English
BG 55, BG 65, BG 85, SH 55, SH 85
Your engine requires a mixture of
gasoline and engine oil.
For health reasons, avoid direct skin
contact with gasoline and avoid inhaling
gasoline vapor.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. This ready-to-use fuel mix
contains no benzol or lead, has a high
octane rating and ensures that you
always use the right mix ratio.
STIHL MotoMix is specially
formulated for use in STlHL engines
and guarantees a long engine life.
MotoMix is not available in all markets.
Mixing Fuel
Unsuitable fuels or lubricants or mix
ratios other than those specified
may result in serious damage to the
engine. Poor quality gasoline or
engine oil may damage the engine,
sealing rings, hoses and the fuel
tank.
Gasoline
Use only high-quality brand-name
gasoline with a minimum octane rating
of 90 – leaded or unleaded.
If your machine is equipped with a
catalytic converter, you must use
unleaded gasoline.
A few tankfuls of leaded gasoline
will greatly reduce the efficiency of
the catalytic converter.
Engine Oil
Use only quality two-stroke engine oil.
We recommend STIHL two-stroke
engine oil since it is specially
formulated for use in STlHL engines
and guarantees a long engine life.
If STIHL two-stroke engine oil is not
available, use only quality two-stroke oil
designed for use in air cooled engines.
Do not use oils designed for water
cooled engines or engines with a
separate lubricating system (e.g.
conventional four-stroke engines).
Use only STIHL 50:1 two-stroke
engine oil for the fuel mix in models with
a catalytic converter.
Mix Ratio
STIHL 50:1 two-stroke engine oil:
50 parts gasoline to 1 part oil
Other high-quality two-stroke engine
oils:
25 parts gasoline to 1 part oil
Examples
:Use a canister approved for storing
fuel. Pour oil into the canister first,
then add gasoline and mix
thoroughly.
Fuel
Gaso-
line
STIHL
engine oil
50:1
Other high-
quality two-
stroke engine
oils:
25:1
Liters Liters (cc) Liters (cc)
1 0.02 (20) 0.04 (40)
5 0.10 (100) 0.20 (200)
10 0.20 (200) 0.40 (400)
15 0.30 (300) 0.60 (600)
20 0.40 (400) 0.80 (800)
25 0.50 (500) 1.00 (1000)
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13BG 55, BG 65, BG 85, SH 55, SH 85
English
Storing Fuel
Store fuel only in approved safety-type
fuel canisters in a dry, cool and safe
location protected from light and the sun.
Fuel mix ages:
Only mix sufficient fuel for a few weeks
work. Do not store fuel mix for longer
than 3 months.
Exposure to light, the sun, low or high
temperatures can quickly make the fuel
mix unusable.
:Thoroughly shake the mixture in the
canister before fueling your
machine.
Pressure may build up in the
canister – open it carefully.
:Clean the fuel tank and canister
from time to time.
Dispose of remaining fuel and
cleaning fluid properly in
accordance with local regulations
and environment requirements.
:Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
:Position the unit so that the filler cap
is facing up.
Take care not to spill fuel while fueling
and do not overfill the tank. STIHL
recommends use of the STIHL filling
system (special accessory).
Important! After fueling, tighten down
filler cap by hand as securely as
possible.
Change the fuel pickup body
once every year
:Drain the fuel tank.
:Use a hook to pull the fuel pickup
body out of the tank and take it off
the hose.
:Push the new pickup body into the
hose.
:Place the pickup body in the tank.
Fueling
295BA033 KN
295BA034 KN
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14
English
BG 55, BG 65, BG 85, SH 55, SH 85
BG 55, 65, SH 55
Observe safety precautions - see
chapter “Safety Precautions”.
Start as follows:
:Set switch (1) to position I
:Squeeze the throttle trigger (2) and
press in the interlock button (3) at
the same time.
:Release the throttle trigger.
:Release the interlock button, this is
the starting throttle position.
The interlock button enables the
throttle trigger to be locked in the full
throttle position.
BG 85, SH 85
Observe safety precautions - see
chapter “Safety Precautions”.
Start as follows:
:Set switch (1) to position I
:Squeeze the throttle trigger (2) and
move the setting lever (4) to midway
position at the same time.
: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
Set the choke lever (5):
For cold start to g
For warm start to e
:Press fuel pump bulb (6) at least five
times.
Starting / Stopping
the Engine
32
1
295BA013 KN
4
1
2
295BA031 KN
295BA015 KN
5
6
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15BG 55, BG 65, BG 85, SH 55, SH 85
English
:Place the unit on the ground.
:Make sure you have a firm footing:
Hold the unit firmly on the ground
with your left hand on the handle
and press down.
:Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
Do not pull out the starter rope all
the way - it might break.
:Do not let the starter grip snap back.
Guide it slowly back into the housing
so that it can rewind properly.
If the engine is cold:
(choke position g)
:Pull the starter rope five times.
:Move the choke lever (5) to e
:Continue cranking until engine runs.
If the engine does not start after 10
pulls with the choke lever set to e:
Set choke to g, pull the starter
rope five times, set choke to eand
continue cranking.
If engine is warm:
:Continue cranking until engine runs
(choke lever to e)
As soon as engine runs
:BG 55, 65, SH 55
Blip the throttle trigger so that
interlock button pops out and the
engine settles down to idle speed
:BG 85, SH 85
Move setting lever forwards to end
position.
If the engine stops during warm-up or
acceleration:
:Repeat starting procedure as
described under “If engine is cold”
Your unit is now ready for operation.
295BA016 KN
295BA043 KN
5
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16
English
BG 55, BG 65, BG 85, SH 55, SH 85
To stop the engine:
:Move switch to position O
Additional hints on starting
- If the engine does not start:
:Make sure all settings are correct
(choke shutter, throttle trigger
in starting throttle position, stop
switch to I)
:Repeat the starting procedure
- If the engine still does not start:
:Move switch to O
:Pull off the spark plug boot (7).
:Unscrew and dry off the spark plug.
:Open throttle wide.
:Crank the engine several times with
the starter to clear the combustion
chamber.
:Refit the spark plug and connect the
spark plug boot – push it down
firmly.
:Move switch to I
:Set choke lever to e-
even if the engine is cold.
:Now start the engine.
Fuel tank run until dry and then
refueled
:Press the fuel pump bulb (6) at least
five times – bulb must be filled with
fuel.
:Now start the engine.
7
295BA017 KN
6
295BA018 KN
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17BG 55, BG 65, BG 85, SH 55, SH 85
English
Dirty air filters reduce engine power
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of
engine power
:Move choke lever to g
:Squeeze the tabs (1) together,
swing filter cover (2) open and take
it away.
:Clean away loose dirt from around
the filter.
:Take the filter (3) out of the
housing (4).
:Install a new filter. As a temporary
measure you can knock it out on the
palm of your hand or blow it out with
compressed air – do not wash!
:Replace any damaged parts.
:Fit the filter (3) in the housing (4).
:Fit the filter cover (2) so that it snaps
into positon.
The carburetor is set at the factory to
provide an optimum fuel-air mixture
under all operating conditions.
Cleaning the Air Filter
1
295BA019 KN
2
4
295BA046 KN
3
Adjusting the Carburetor
(With idle speed screw LD)
295BA022 KN
+
LD
-
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18
English
BG 55, BG 65, BG 85, SH 55, SH 85
Standard setting
:Check the air filter and replace if
necessary.
:Start and warm up the engine.
:Carefully screw the idle speed
screw (LD) down onto its seat
counterclockwise (left-hand thread).
Then open it two full turns clockwise
(standard setting).
Engine stops when engine is idling:
Carry out standard setting
(open the LD screw two full turns)
:Rotate idle speed screw (LD) about
one half turn clockwise until the
engine runs smoothly.
Erratic idling behavior, poor
acceleration:
Carry out standard setting
(open the LD screw two full turns)
:Rotate idle speed screw (LD) about
one half turn counterclockwise.
General information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the engine idle speed within fine
limits.
Standard setting
:Shut off the engine.
:Turn high speed screw (H)
counterclockwise as far as stop
(max. 3/4turn).
:Set the low speed screw (L) to one
full turn open.
(With idle speed screw LA)
L
H
295BA044 KN
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19BG 55, BG 65, BG 85, SH 55, SH 85
English
Adjustment for operation at high
altitude or at sea level
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level:
:Check the air filter and clean it if
necessary.
:Warm up the engine.
At high altitude
:Rotate the high speed screw (H)
clockwise (leaner) no further than
stop.
At sea level
:Rotate the high speed screw (H)
counterclockwise (richer) no further
than stop.
Adjusting idle speed
Engine stops while idling
:Set low speed screw (L) to one full
turn open.
:Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – then back it off 1/4turn
from that position.
Erratic idling behavior; poor
acceleration
(even though low speed screw is open
one full turn)
Idle setting is too lean:
:Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Power tools with a catalytic converter*
may only be operated with unleaded
gasoline and STIHL two-stroke
engine oils in a mix ratio of 50:1
(see chapter “Fuel”).
The catalytic converter in the muffler
reduces noxious emissions in the
exhaust gas.
Correct adjustment of the carburetor
(if adjustable) and observance of the
specified mix ratio of gasoline and two-
stroke engine oil are essential to
minimize harmful exhaust emissions
and ensure a long catalyst service life.
* see “Guide to Using this Manual”
L
295BA045 KN
LA
Catalytic Converter*
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