STIHL KM 55 Owner's Manual
STIHL KM 55
STIH)
Instruction Manual
Manual de instrucciones
Warning!
For safe operation follow all safety
precautions in Instruction Manual - improper
use can cause serious injury.
Advertencia!
Para su seguridad durante el manejo de este
producto, siga siempre las precauciones de
seguridad dadas en el manual de
instrucciones - el uso indebido puede causar
lesiones graves.
Contents
English / USA
KombiSystem ................................... 2
Guide to Using this Manual .............. 2
Safety Precautions and
Working Techniques ......................... 3
Approved KombiTools .................... 10
Mounting the Bike Handle .............. 11
Mounting the Loop Handle ............. 12
BA_SE_110_003_01_06.fmPrinted on chlorine-free paper.
Fitting the Carrying Eye .................. 14
Fuel ................................................ 14
Fueling ............................................ 15
Starting / Stopping the Engine ........ 15
Operating Instructions .................... 19
Cleaning the Air Filter ..................... 19
Motor Management ........................ 20
Adjusting the Carburetor ................ 20
Catalytic Converter ......................... 22
Checking the Spark Plug ................ 22
Rewind Starter ................................ 23
Storing the Machine ........................ 24
Inspections and Maintenance by
STIHL Service ................................ 24
Maintenance Chart ......................... 25
Main Parts and Controls ................. 26
Specifications ................................. 28
Special Accessories ....................... 29
Maintenance and Repairs ............... 29
Printing inks contain vegetable oils; paper can be recycled.
STIHL Incorporated
Federal Emission Control
Warranty Statement ........................ 30
STIHL Incorporated California
Exhaust and Evaporative Emissions
Control Warranty Statement ........... 32
Trademarks .................................... 34
Allow only persons who understand the
manuals of the KombiEngine and the
KombiTool to operate your power tool.
To receive maximum performance and
satisfaction from your STIHL power tool,
it is important that you read and
understand the maintenance and safety
precautions, starting on page 4, before
using your power tool.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in the
two manuals.
STIHl
© ANDREAS STIHL AG & Co. KG, 2009
0458 461 8621 A. M8.8 .B9. CP. Printed in USA
1KM 55
English / USA
!Warning!
Because this power tool is a high-speed
working tool, some special safety
precautions must be observed to reduce
the risk of personal injury. Careless or
improper use may cause serious or even
fatal injury.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements are made from time to time.
Therefore, STIHL cannot be responsible
for changes, modifications or
improvements not covered in this
manual. If the operating characteristics
or the appearance of your power tool
differs from those described in the two
manuals, please contact your STIHL
dealer for information and assistance.
KombiSystem
+
.
.
.
.
+
In the STIHL KombiSystem a number of
different KombiEngines and KombiTools
can be combined to produce a power
tool. In this instruction manual the
functional unit formed by the
KombiEngine and KombiTool is referred
to as the power tool.
The KombiEngine and KombiTool come
with separate instruction manuals.
Always read and make sure you
understand both instruction manuals
before starting and using your machine.
Keep the manuals in a safe place for
later reference.
Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
: 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
002BA159 KN
contain item numbers that appear in the
illustration.
Example:
Loosen the screw (1)
Lever (2) ...
2
KM 55
English / USA
Safety Precautions and Working Techniques
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 understanding of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual 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.
Because this
KombiEngine is the
engine for a high-speed,
power tool, special safety
precautions must be
observed to reduce the
risk of personal injury.
It is important that you
read, fully understand and
observe the following
safety precautions and
warnings. Read the
instruction manuals and
the safety precautions of your
KombiEngine and KombiTool
periodically. Careless or improper use
may cause serious or fatal injury.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
!Warning!
Do not lend or rent your power tool
without the instruction manuals. Be sure
that anyone using it understands the
information contained in these manuals.
3KM 55
English / USA
!Warning!
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
!Warning!
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
Most of these safety precautions and
warnings apply to the use of all STIHL
power tools. Different models may have
different parts and controls. See the
appropriate section of your
KombiEngine and KombiTool instruction
manuals for a description of the controls
and the function of the parts of your
model.
Safe use of a KombiEngine involves
1. the operator
2. the power tool
3. the use of the power tool.
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate
this machine when you are fatigued.
!Warning!
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
this machine.
!Warning!
Prolonged use of a power tool (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud's phenomenon) or
carpal tunnel syndrome.
These conditions reduce the hand's
ability to feel and regulate temperature,
produce numbness and burning
sensations and may cause nerve and
circulation damage and tissue necrosis.
All factors which contribute to whitefinger disease are not known, but cold
weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
– Most STIHL power tools are
available with an anti-vibration
(“AV”) system designed to reduce
the transmission of vibrations
created by the engine to the
operator's hands. An AV system is
recommended for those persons
using power tools on a regular or
sustained basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A power tool with loose
components or with damaged or
worn AV buffers will tend to have
higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure. Take
frequent breaks.
4
KM 55
English / USA
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should closely monitor the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
!Warning!
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with a pacemaker should
consult their physician and the
pacemaker manufacturer before
operating this tool.
Proper Clothing
!Warning!
To reduce the risk of injury, the operator
should wear proper protective apparel.
!Warning!
Power tool noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their hearing checked
regularly.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
For further instructions on proper
clothing see the safety precautions in
the instruction manual of the KombiTool
you are using.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
“Main Parts and Controls.”
!Warning!
Never modify this power tool in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL KombiEngine
model are authorized. Although certain
unauthorized attachments are useable
with STIHL power tools, their use may, in
fact, be extremely dangerous.
If this 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. Check in particular that
the fuel system is tight (no leaks) and
that the controls and safety devices are
working properly. Do not continue
operating this machine if it is damaged.
In case of doubt, have it checked by your
STIHL servicing dealer.
5KM 55
English / USA
THE USE OF THE POWER TOOL
Transporting the Power Tool
!Warning!
Always switch off the engine and make
sure the working tool has stopped before
putting a power tool down. When
transporting your power tool in a vehicle,
properly secure it to prevent turnover,
fuel spillage and damage to the power
tool.
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on “Fuel” of your instruction manual).
!Warning!
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and serious
burn injury or property
damage. Use extreme caution when
handling gasoline or fuel mix.
Do not smoke or bring any fire or flame
near the fuel or the power tool. Note that
combustible fuel vapor may escape from
the fuel system.
Fueling Instructions
!Warning!
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before
refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Wipe off
any spilled fuel before starting your
machine.
!Warning!
Check for fuel leakage while refueling
and during operation. If fuel leakage is
found, do not start or run the engine until
the leak is fixed and any spilled fuel has
been wiped away. Take care not to get
fuel on your clothing. If this happens,
change your clothing immediately.
Different models may be equipped with
different fuel caps.
Cap with grip
!Warning!
In order to reduce the risk of fuel spillage
and fire from an improperly tightened
fuel cap, correctly position and tighten
the fuel cap in the fuel tank opening.
To do this with this STIHL
cap, raise the grip on the
top of the cap until it is
upright at a 90° angle.
Insert the cap in the fuel
tank opening with the
triangular marks on the grip of the cap
and on the fuel tank opening lining up.
Using the grip, turn the cap firmly
clockwise as far as it will go (approx. a
quarter turn).
Fold the grip flush with the
top of the cap. If the grip
does not lie completely
flush with the cap and the
detent on the grip does
not fit in the
corresponding recess in the filler neck,
the cap is not properly seated and
tightened and you must repeat the
above steps.
6
KM 55
English / USA
Screw cap
!Warning!
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill
quantities of fuel. In order
to reduce the risk of fuel
spillage and fire, tighten the fuel filler cap
by hand as securely as possible.
Before Starting
!Warning!
Always check your KombiEngine for
proper condition and operation before
starting, particularly the throttle trigger,
throttle trigger interlock, stop switch and
working tool. The throttle trigger (if
applicable) must move freely and always
spring back to the idle position. Never
attempt to modify the controls or safety
devices.
!Warning!
Never use a power tool that is damaged
or not properly maintained.
Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, grease
or resin in order for you to maintain a firm
grip and properly control your power
tool.
Starting
Start the engine at least 10 feet
(3 meters) from the fueling spot,
outdoors only.
For specific starting instructions, see the
appropriate section of your
KombiEngine and KombiTool manuals.
Place the power tool on firm ground or
other solid surface in an open area.
Maintain good balance and secure
footing.
!Warning!
To reduce the risk of injury from loss of
control, be absolutely sure that the
working tool is clear of you and all other
obstructions and objects, including the
ground, because when the engine starts
at starting-throttle, engine speed will be
fast enough for the clutch to engage and
move the working tool.
!Warning!
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
!Warning!
To reduce the risk of injury from loss of
control, do not attempt to “drop start”
your power tool.
!Warning!
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
result in injury to your hand or fingers
and may damage the starter
mechanism.
See also the safety precautions on
Starting in the instruction manual of the
KombiTool.
!Warning!
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
7KM 55
English / USA
Important Adjustments
!Warning!
To reduce the risk of personal injury from
loss of control or contact with the
running working tool, do not use a power
tool with incorrect idle adjustment. At
correct idle speed, the working tool
should not move. For directions on how
to adjust idle speed, see the appropriate
section of your instruction manual. If you
cannot set the correct idle speed, have
your STIHL dealer check your power
tool and make proper adjustments and
repairs.
During Operation
Holding and controlling the power
tool
Always hold the unit firmly with both
hands on the handles while you are
working. Wrap your fingers and thumbs
around the handles.
Working conditions
Operate and start your power tool only
outdoors in a well ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
!Warning!
As soon as the engine is
running, this product
generates toxic exhaust
fumes containing
chemicals (such as
unburned hydrocarbons
and carbon monoxide) known to cause
respiratory problems, cancer, birth
defects, or other reproductive harm.
Some of the gases (e.g. carbon
monoxide) may be colorless and
odorless. To reduce the risk of serious or
fatal injury/illness from inhaling toxic
fumes, never run the machine indoors or
in poorly ventilated locations.
Operating instructions
!Warning!
Do not operate your power tool using the
starting throttle lock, as you do not have
control of the engine speed.
In the event of an emergency, switch off
the engine immediately – move the slide
control / stop switch to 0 or STOP.
002BA057 KN
!Warning!
The muffler and other parts of the engine
(e.g. fins of the cylinder, spark plug)
become hot during operation and remain
hot for a while after stopping the engine.
To reduce risk of burns do not touch the
muffler and other parts while they are
hot.
!Warning!
To reduce the risk of fire and burn injury,
keep the area around the muffler clean.
Remove excess lubricant and all debris
such as pine needles, branches or
leaves. Let the engine cool down sitting
on concrete, metal, bare ground or solid
wood (e.g. the trunk of a felled tree)
away from any combustible substances.
!Warning!
Never modify your muffler. The muffler
could be damaged and cause an
increase in heat radiation or sparks,
thereby increasing the risk of fire and
burn injury. You may also permanently
damage the engine. Have your muffler
serviced and repaired by your STIHL
servicing dealer only.
Your right hand should grip the rear
handle. This also applies to left-handers.
8
KM 55
English / USA
Catalytic converter
!Warning!
Some STIHL power tools
are equipped with a
catalytic converter, which
is designed to reduce the
exhaust emissions of the
engine by a chemical
process in the muffler. Due to this
process, the muffler does not cool down
as rapidly as conventional mufflers when
the engine returns to idle or is shut off.
To reduce the risk of fire and burn
injuries, the following specific safety
precautions must be observed.
!Warning!
Since a muffler with a catalytic converter
cools down less rapidly than conventional mufflers, always set your power
tool down in the upright position and
never locate it where the muffler is near
dry brush, grass, wood chips or other
combustible materials while it is still hot.
!Warning!
An improperly mounted or damaged
cylinder housing or a damaged/
deformed muffler shell may interfere
with the cooling process of the catalytic
converter. To reduce the risk of fire or
burn injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a damaged/
deformed muffler shell.
Your catalytic converter is furnished with
screens designed to reduce the risk of
fire from the emission of hot particles.
Due to the heat from the catalytic
reaction, these screens will normally
stay clean and need no service or
maintenance. If you experience loss of
performance and you suspect a clogged
screen, have your muffler maintained by
a STIHL servicing dealer.
MAINTENANCE, REPAIR AND
STORING
Maintenance, replacement, or repair
of the emission control devices and
systems may be performed by any
nonroad engine repair establishment
or individual. However, if you 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.
!Warning!
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non STIHL parts may cause serious or
fatal injury.
Strictly follow the maintenance and
repair instructions in the appropriate
section of your KombiEngine and
KombiTool instruction manuals. Please
refer to the maintenance charts
respectively the maintenance notes in
these manuals.
9KM 55
English / USA
Approved KombiTools
!Warning!
Always stop the engine and make sure
that the working tool is stopped before
doing any maintenance or repair work or
cleaning the power tool. Do not attempt
any maintenance or repair work not
described in your KombiEngine and
KombiTool instruction manuals. Have
such work performed by your STIHL
servicing dealer only.
!Warning!
Use the specified spark plug and make
sure it and the ignition lead are always
clean and in good condition. Always
press spark plug boot snugly onto spark
plug terminal of the proper size. (Note: If
terminal has detachable SAE adapter
nut, it must be attached.) A loose
connection between spark plug boot and
the ignition wire connector in the boot
may create arcing that could ignite
combustible fumes and cause a fire.
!Warning!
Never test the ignition system with the
ignition wire boot removed from the
spark plug or with a removed spark plug,
since uncontained sparking may cause
a fire.
!Warning!
Do not operate your power tool if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
If your muffler was equipped with a
spark-arresting screen to reduce the risk
of fire, never operate your power tool if
the screen is missing or damaged.
Remember that the risk of forest fires is
greater in hot or dry weather.
Store the power tool in a dry and high or
locked location out of reach of children.
Before storing for longer than a few
days, always empty the fuel tank. See
chapter "Storing the machine" in this
manual.
10
KM 55
The following STIHL KombiTools may be
mounted on the KombiEngine
KombiTool Purpose
FS-KM Brushcutter with
mowing head
FS-KM
1)
Brushcutter with
grass cutting blade
1) 2)
HL-KM 0/90°
Hedge trimmer,
adjustable
1) 2)
HL-KM 135°
Hedge trimmer,
adjustable
HL-KM 0°
FH-KM
HT-KM
BF-KM
FCB-KM
FCS-KM
KB-KM
KW-KM
1)
Barrier bar must be mounted on
2)
1)
2)
1)
2)
2)
2)
2)
Hedge trimmer
Power scythe
Pole pruner
Pick tine cultivator
Power edger
Bristle brush
PowerSweep
loop handle
2)
Unsuitable or not approved for
KombiEngines with bike handle
Mounting the Bike Handle
5
7
6
4
2
1
Fitting the handlebar
: Place the clamp (1) and handle
support (2) on the drive tube (3).
: Position the handlebar (4) in the
handle support – the rubber grip (5)
must be on the left (viewed from
engine).
: Place clamp (6) on handle support.
: Insert screws (7) in the holes and
screw down as far as stop in clamp.
3
English / USA
A
233BA025 KN
: Secure handlebar (4) on the drive
tube (3) at distance (A) of approx.
15 cm (6 in) from the powerhead.
: Align the handlebar.
: Tighten down the screws firmly.
4
3
233BA018 KN
11KM 55
English / USA
Mounting the Loop Handle
11
10
8
12
9
4
12
Fitting the control handle
: Release the screw (8) and remove it
with the washer. The nut (9) remains
in the control handle (10).
: Push the control handle onto the
handlebar (4) – the throttle trigger
(11) must point towards the
gearhead.
: Line up the holes (12).
: Fit screw and washer in control
handle and tighten down firmly.
13
14
13
Fitting the throttle cable
Do not kink the throttle cable - make
sure the throttle trigger moves freely.
: Push the throttle cable (13) into the
retainer (14).
233BA038 KN
14
233BA027 KN
2
Loop handle with barrier bar
: Insert square nuts (1) in the
barrier bar (2).
: Line up the holes.
1
1
002BA098 KN
* see “Guide to Using this Manual”
12
KM 55
English / USA
8
4
2
8
7
7
4
A
9
3
3
10
5
5
4
6
7
: Place the clamp (3) in the loop
handle (4) and position them both
against the drive tube (5).
: Fit the clamp (6) and place the
barrier bar (2) in position.
Note correct position.
: Line up the holes.
: Insert screws (7) in holes and screw
them into the barrier bar as far as
stop.
: Go to “Securing the loop handle”.
6
1
002BA099 KN
Loop handle without barrier bar
: Place the clamp (3) in the loop
handle (4) and position them both
against the drive tube (5).
: Fit the clamp (6) and line up the
holes.
: Fit washers (7) on screws (8).
: Insert screws (8) in holes and screw
on the square nuts (1) as far as
stop.
: Go to “Securing the loop handle”.
1
002BA136 KN
Securing the loop handle
: Secure the loop handle (4)
approx. 8”/20cm (A) forward of
the control handle (9).
: Line up the loop handle.
: Tighten down the screws firmly –
lock the nuts if necessary.
10= Sleeve*
* see “Guide to Using this Manual”
002BA147 KN
13KM 55
English / USA
Fitting the Carrying Eye
1
1
2
1)
: For position of carrying eye
"Parts and Controls"
: Place the clamp (1) with the
tapped hole on the left-hand side
of the drive tube.
: Squeeze the two ends of the clamp
together and hold in that position.
: Insert M 6 x 14 screw (2).
: Line up the carrying eye.
: Tighten down the screw firmly.
see
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and quality two-stroke
air cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 (R+M/2). If
the octane rating of the mid-grade
gasoline in your area is lower, use
premium unleaded fuel.
Fuel with a lower octane rating may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
002BA142 KN
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or even
damage the engine. For this reason
STIHL recommends that you use only
nationally recognized high-quality
unleaded gasoline!
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke
engine oils that are designed for use
only in air cooled two-cycle engines.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STlHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chainsaws, mopeds, etc.).
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the canister from
your vehicle and place the canister on
the ground before filling. Do not fill fuel
canisters that are sitting in or on a
vehicle.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The machine‘s fuel tank and the canister
in which fuel mix is stored should be
cleaned as necessary.
1) Included as standard or available as
special accessory
14
KM 55
English / USA
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved fuel-canisters only.
When mixing, pour oil into the canister
first, and then add gasoline. Close the
canister and shake it vigorously by hand
to ensure proper mixing of the oil with
the fuel.
Gasoline
US gal. US fl.oz
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Oil (STIHL 50:1 or
equivalent high-quality oils)
Fueling
Before fueling, clean the filler cap and
the area around it to ensure that no dirt
falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
In order to reduce the risk of burns
or other personal injury from
escaping gas vapor and fumes,
remove the fuel filler cap carefully
so as to allow any pressure build-up
in the tank to release slowly.
After fueling, tighten fuel cap as
securely as possible by hand.
Starting / Stopping the Engine
56
4
7
232BA046 KN
STOP
2
Version with Bike Handle
Controls
Throttle trigger interlock (1), throttle
trigger (2) and slide control (3) with the
positions:
3
1
233BA037 KN
START (4)
The normal run position # (5)
and
STOP–O (6) – to stop engine, move
slide control in direction of c(7).
15KM 55
English / USA
Starting
: Hold down the trigger interlock and
squeeze the throttle trigger.
: Keep both levers in that position.
: Move the slide control to START
position and hold it there.
: Now release the throttle trigger,
slide control and trigger interlock in
that order. This is the
starting-throttle position.
: Go to "All Versions"
2
1
3
4
5
6
7
Version with Loop Handle
Controls
Stop switch (1) with positions:
Normal run position I (2), and
O – Stop (3).
Throttle trigger interlock (4).
Throttle trigger (5) with tongue (6) and
catch (7).
6
233BA034 KN
Starting
: Move stop switch to position I
: Hold down throttle trigger interlock.
: Squeeze the throttle trigger until the
catch on the tongue (6) can be
engaged on the housing.
: Release the throttle trigger, tongue
and throttle trigger interlock in that
order. This is the starting throttle
position.
: Go to "All Versions".
461BA000 KN
16
KM 55
English / USA
9
233BA020 KN
8
All Versions
: Set the choke lever (8):
For cold start to g
For warm start to e
– also use this setting if the engine
has been running but is still cold
: Press the fuel pump bulb (9) at least
five times, even if the bulb is still
filled with fuel.
232BA011 KN
: Place the unit on the ground:
Check that the tool is not touching
the ground or any other obstacles –
see also chapter "Starting/Stopping
the Engine" in the CombiTool’s
instruction manual.
: Make sure you have a firm footing.
: Press the unit firmly against the
ground with your left hand on the fan
housing. Your thumb should be
under the fan housing.
Do not stand or kneel on the drive
tube!
233BA014 KN
Standard versions:
: 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 starter rope to full
length – it might break.
Versions with ErgoStart:
: Pull the starter grip slowly with your
right hand until you feel the first stop
- and then pull it out slowly and
steadily.
Do not pull out the starter rope to its
full length - it might otherwise break.
232BA014 KN
17KM 55
English / USA
: Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
8
: Crank the engine until it fires. After
no more than five pulls, move the
choke lever (8) to e
: Continue cranking.
As soon as the engine runs
Versions with bike handle:
: Blip the throttle trigger – the engine
settles down to idle speed.
Versions with loop handle:
: Squeeze throttle until the tongue
disengages – the engine settles
down to idle speed.
Make sure the carburetor is
correctly adjusted – the tool must
not move when the engine is idling.
Your machine is now ready for
operation.
To shut down the engine:
: Move slide control in direction of
arrow ( h ) to STOP - $ or stop
switch to STOP / O
232TI015 KN
If the engine does not start
Choke lever
If you did not move the choke lever to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
: Move the choke lever to e
: Move the slide control, throttle
trigger lock and throttle trigger to the
starting throttle position.
: Start the engine – 10 to 20 strong
pulls may be necessary.
If the engine still does not start
10
232BA048 KN
: Move slide control or stop switch to
STOP / O.
Remove the spark plug boot (10).
18
KM 55
English / USA
Operating Instructions Cleaning the Air Filter
: Unscrew and dry off the spark plug.
: Open the 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.
: Set the stop switch or slide control
to I / #
: Set choke lever to e, even if the
engine is cold.
: Now start the engine.
Fuel tank run until dry
: After refueling, press the fuel pump
bulb at least five times – even if bulb
is filled with fuel.
: Adjust choke lever to suit engine
temperature.
: Now start the engine.
During break-in period
A factory new machine should not be run
at high revs (full throttle off load) for the
first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During operation
After a long period of full-throttle
operation, allow engine to run for a while
at idle speed so that the heat in the
engine can be dissipated by flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
After finishing work
Wait for engine to cool down. Drain the
fuel tank. Store the machine in a dry
place. Check tightness of nuts and
screws (not adjusting screws) at regular
intervals and retighten as necessary.
2
1
232BA017 KN
Dirty air filters reduce engine power
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power
: Set choke lever to g
: Press in the tab (1) and swing the
filter cover (2) open.
: Clean away loose dirt from around
the filter.
19KM 55
English / USA
4
Motor Management Adjusting the Carburetor
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.
L
H
1
4/
3
3
: Remove the felt filter element (3).
: Do not wash the felt element. Fit a
new one. As a temporary measure,
clean it by knocking it out on the
palm of your hand or blowing it out
with compressed air.
Replace damaged parts of filter.
: Place the felt element (3) in the filter
housing (4).
: Close the filter cover so that it snaps
into position.
232BA018 KN
LA
233BA028 KN
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.
20
KM 55
English / USA
Standard Setting
: Shut off the engine.
: Mount the CombiTool.
: Check the air filter and clean or
replace as necessary.
: Turn high speed screw (H)
counterclockwise (max.
far as stop.
: Carefully screw the low speed
screw (L) down onto its seat. Then
open it one full turn counterclockwise.
: Start and warm up the engine.
: Adjust idle speed with the idle speed
screw (LA) so that the tool does not
move.
3
/4 t ur n) as
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude, at sea level or
after changing the cutting tool.
: Carry out standard setting.
: Warm up engine for about 3 minutes
at full throttle.
Rule of thumb
Turn high speed screw (H) about 1/4
turn for every 3300 ft (1000m)
change in altitude.
At high altitude
: Turn high speed screw (H) clock-
wise (leaner) no further than stop.
At sea level
: Turn high speed screw (H) counter-
clockwise (richer) no further than
stop.
Maximum engine speed is normally
reached with the standard setting in
each case.
Adjusting Idle Speed
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
: Warm up the engine for about 3
minutes.
Engine stops while idling
: Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – the tool must not move.
CombiTool moves when engine is
idling
: Turn idle speed screw (LA) counter-
clockwise until the tool stops moving
and then turn the screw about
another
direction.
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise (about
until the engine runs and
accelerates smoothly.
1
/2 to 1 turn in the same
1
/4 turn)
* see "Guide to Using this Manual"
21KM 55
English / USA
Catalytic Converter* Checking the Spark Plug
Erratic idling behavior
Idle setting too rich:
: Turn low speed screw (L) clockwise
(about 1/4 turn) until the engine runs
and accelerates smoothly.
Units with a catalytic converter* may
only be operated with unleaded
gasoline and STIHL two cycle engine
oil or equivalent quality two cycle engine
oils in a mix ratio of 50:1 (see chapter
“Fuel”).
The catalylic converter in the muffler
reduces noxious emissions in the
exhaust gas.
Correct adjustment of the carburetor (if
adjustable) and observance of the
specified mix ratio of gasoline and two
cycle engine oil are essential to
minimize harmful exhaust emissions
and ensure a long catalyst service life.
000BA002 KN
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
22
* see “Guide to Using this Manual”
KM 55
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