Stihl KM 91 R KM 91 R

STIHL KM 91 R

WARNING

Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.

ADVERTENCIA

Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.

Instruction Manual
Manual de instrucciones

Instruction Manual
1 - 32

Manual de instrucciones
33 - 68

Contents

English

KombiSystem 2
Guide to Using this Manual 2
Safety Precautions and Working

Techniques 3
Approved KombiTools 11
Mounting the Loop Handle 11
Adjusting the Throttle Cable 12
Fuel 12

Original Instruction ManualPrinted on chlorine-free paper

Fueling 14
Starting / Stopping the Engine 15
Operating Instructions 17
Replacing the Air Filter 18
Engine Management 18
Adjusting the Carburetor 18
Spark Arresting Screen in Muffler 19
Spark Plug 19
Storing the Machine 21
Maintenance and Care 22
Main Parts 24
Specifications 25
Maintenance and Repairs 26
Disposal 26

Printing inks contain vegetable oils, paper can be recycled.

Limited Warranty 27
STIHL Incorporated Federal

Emission Control Warranty
Statement 27

STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 29

Trademarks 31

Allow only persons who fully understand
the manuals of the KombiEngine and the
KombiTool to operate this power tool
combination.

To receive maximum performance and
satisfaction from your STIHL power tool,
it is important that you read, understand
and follow the safety precautions and
the operating and maintenance
instructions in chapter "Safety
Precautions and Working Techniques"
before using your power tool. For further
information you can go to
www.stihlusa.com.

Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in the
two manuals.

WARNING

Because this KombiEngine is the engine
for a high-speed power 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.

© ANDREAS STIHL AG & Co. KG, 2022

0458-468-8621-A. VA9.C22.

0000007504_012_GB

KM 91 R

This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.

1

English

KombiSystem Guide to Using this Manual

In the STIHL KombiSystem a number of
different KombiEngines / KombiMotors
and KombiTools can be combined to
produce a power tool. In this instruction
manual the functional unit formed by the
KombiEngine / KombiMotor and
KombiTool is referred to as the power
tool.

The instruction manuals for the
KombiEngine / KombiMotor and
KombiTool should be used together for
the power tool.

Always read and make sure you
understand both instruction manuals
before using your power tool for the first
time and keep them in a safe place for
future reference.

Pictograms

The meanings of the pictograms
attached to or embossed on the
machine are explained in this manual.

Depending on the model concerned, the
following pictograms may be on your
machine.

Fuel tank for gasoline
and engine oil mixture

Press to operate decom­pression valve

Manual fuel pump

Press to operate manual
fuel pump

Filler hole for gear
lubricant

Air intake summer mode

Air intake winter mode

Handle heating

Symbols in Text

Many operating and safety instructions
are supported by illustrations.

The individual steps or procedures
described in the manual may be shown
in different ways:

N A bullet indicates a step or

procedure.

A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. For example:

N Remove the screw (1)
N Pull the spark arresting screen (2)

upwards out of the muffler

In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are indicated with the
symbols and signal words described
below:

DANGER

Indicates a hazardous situation that, if
not avoided, will result in death or
serious injury.

WARNING

Indicates a hazardous situation that, if
not avoided, could result in death or
serious injury.

NOTICE

Indicates a risk of property damage,
including damage to the machine or its
individual components.

2

KM 91 R

English

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. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differs from those
described in this manual, please contact
your STIHL dealer or the STIHL
distributor for your area for assistance.

Safety Precautions and
Working Techniques

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.

Use your power tool only for the
applications described in the instruction
manual of the KombiTool you are using.

WARNING

Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.

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.

Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.

Safe use of a KombiEngine involves

1. the operator

2. the power tool

3. the use of the power tool

KM 91 R

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English

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 machine to the
operator's hands. An AV system is
recommended for those persons
using power tools on a regular or
sustained basis.

– Wear gloves – not while using

KombiTool BG-KM – and keep your
hands warm.

– Keep the AV system well

maintained. A power tool with loose
components or with damaged or
worn AV elements 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.

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.

Avoid loose-fitting jack­ets, scarfs, neckties,
jewelry, flared or cuffed
pants, unconfined long
hair or anything that
could become caught on
branches, brush or the
moving parts of the unit.
Secure hair so it is above
shoulder level.

For further instructions on proper
clothing see the safety precautions in
the instruction manual of the KombiTool
you are using.

4

KM 91 R

English

THE POWER TOOL

For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts."

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.

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 oil-

gasoline mixture for fuel (see the "Fuel"
chapter in this 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

To reduce the risk of fire and serious
personal injury, always place the power
tool on the ground before attempting to
fuel the machine.

WARNING

Pick a Safe Location

To reduce the risk of fire and explosion,
fuel your power tool in a well-ventillated
area, outdoors away from flames, pilot
lights, heaters, electric motors, and
other sources of ignition. Vapors can be
ignited by a spark or flame many feet
away. 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 power tool. Take care not to get fuel
on your clothing. If this happens, change
your clothing immediately.

Allow the Power Tool to Cool Before
Removing the Fuel Cap

WARNING

Gasoline vapor pressure may build up
inside the fuel tank. The amount of
pressure depends on a number of
factors such as the fuel used, altitude
and temperature. To reduce the risk of
burns and other personal injury from
escaping gas, vapor and fumes, always
shut off the engine and allow it to cool
before removing the fuel cap.

The engine is air cooled. When it is shut
off, cooling air is no longer drawn across
the cylinder and engine temperatures
will rise for several minutes before
starting to cool. In hot environments,
cooling will take longer. To reduce the
risk of burns and other personal injury
from escaping gas, vapor and fumes,
allow the power tool to cool. If you need
to refuel before completing a job, turn off
the machine and allow the engine to cool
before opening the fuel tank.

KM 91 R

5

English

Fuel Spraying or “Geysering”

WARNING

Removing the cap on a pressurized fuel
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the fuel tank in all directions. The
escaping gasoline, vapors or fumes can
cause serious personal injury, including
fire and burn injury, or property damage.

Sometimes also referred to as "fuel
geysering," fuel spraying is an expulsion
of fuel, vapors and fumes which can
occur in hot conditions, or when the
engine is hot, and the tank is opened
without allowing the power tool to cool
adequately. It is more likely to occur
when the fuel tank is half full or more.

Pressure is caused by fuel and heat and
can occur even if the engine has not
been running. When gasoline in the fuel
tank is heated (by ambient
temperatures, heat from the engine, or
other sources), vapor pressure will
increase inside the fuel tank.

Some blends of gasoline, particularly
those designed for use in winter, are
more volatile and may cause tanks to
pressurize more quickly or create
greater pressure. At higher altitudes,
fuel tank pressurization is more likely.

How to Avoid Fuel Spraying
Removing the fuel cap on a pressurized

tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the fuel tank in all directions. To reduce
the risk of burns, serious injuries or
property damage from fuel spraying:

– Follow the fueling instructions in this

chapter.

– Always assume your fuel tank is

pressurized.

– Allow the power tool to cool before

removing the fuel cap.

– In hot environments, cooling will

take longer.

– The engine is air cooled. When it is

shut off, cooling air is no longer
drawn across the cylinder and the
engine temperature will rise for
several minutes before starting to
cool.

After the power tool has cooled
appropriately, follow the safety
instructions in this chapter for removing
the cap.

Never remove the fuel filler cap by
turning it directly to the open position.
First check for residual pressure in the
tank by slowly turning the cap
approximately 1/2 turn counter­clockwise. The cap should be held in
place by the threads while allowing
residual vapor/pressure to be relieved.
Once the fumes or vapor have been
relieved, turn the cap further until it can
be removed from the tank opening.

Use only good quality fuel that is
appropriate for the season (summer v.
winter blends). Some blends of

gasoline, particularly winter blends, are
more volatile and can contribute to fuel
spraying.

Removing the Threaded Fuel Filler Cap

WARNING

After allowing the power tool to cool,
remove the fuel filler cap slowly and
carefully to allow any remaining
pressure build-up in the tank to release:

– While maintaining steady,

downward pressure, slowly turn the
cap approximately 1/2 turn counter­clockwise.

– If any significant venting occurs,

immediately re-seal the tank by
turning the cap clockwise to the
closed position. Allow the power
tool to cool further before
attempting to open the tank.

– Turn the cap to the open position

only after the contents of the tank
are no longer under pressure.

– Never remove the cap by turning it

directly to the open position. First
allow the power tool to cool
adequately and then release any
residual pressure by slowly turning it
approximately 1/2 turn counter­clockwise.

– Never attempt to remove the cap

while the engine is still hot or
running.

6

KM 91 R

English

Installing the Threaded Fuel Filler Cap

WARNING

Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quanti­ties of fuel. To reduce the
risk of fuel spillage and
fire, tighten the fuel filler
cap by hand with as

much force as possible.
Damaged or Broken Cap
If your fuel cap does not tighten properly,

it may be damaged or broken. Stop
using the power tool and take it to your
authorized STIHL dealer for repair.

Vapor Lock

WARNING

Vapor lock occurs when fuel in the fuel
line or carburetor vaporizes, causing
bubbles to block the free flow of liquid
fuel into the carburetor. Vapor lock
cannot be relieved or affected by
opening the fuel tank. Removing the fuel
filler cap without first allowing the power
tool to cool adequately can result in fuel
spraying. Always follow the instructions
in this section when removing the fuel
cap.

To relieve vapor lock:
– Press the manual fuel pump bulb at

least 20 to 30 times – even if the
bulb is already filled with fuel – to
clear the vapor and send liquid fuel
into the carburetor. Then start the
power tool. For specific starting
instructions, see the appropriate
section of your instruction manual.

– If the manual fuel pump bulb will not

be filled, place the Choke Knob to
the starting throttle position < and
pull the starter cord until the engine
runs.

– If your power tool will not restart, or

if vapor lock occurs again, the
power tool is being used in
conditions too extreme for the fuel
being used. Discontinue use and let
the engine cool completely before
attempting to start the power tool.

Before Operation

WARNING

Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, stop switch, cutting
attachment, deflector and harness. The
throttle trigger must move freely and
always spring back to the idle position.
Never attempt to modify the controls or
safety devices.

WARNING

Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
power tools equipped with a manual fuel
pump). Do not start the engine if there

are leaks or damage – risk of fire. Have
the power tool repaired by a STIHL
servicing dealer before using it.

WARNING

Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely and
securely assembled.

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.

Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, fuel mix,
grease or resin in order for you to
maintain a firm grip and properly control
your power tool.

For specific starting instructions, see the
appropriate section of your
KombiEngine and KombiTool manuals.

Starting
Start the engine at least 10 feet (3 m)

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.

KM 91 R

7

English

002BA057 KN

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.

Once the engine has started,
immediately blip the throttle trigger,
which should release the starting throttle
and allow the engine to slow down to
idle.

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.

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.

Your right hand should grip the rear
handle. This also applies to left-handers.

WARNING

To reduce the risk of injury from loss of
control, never work on a ladder or on any
other insecure support.

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 (including
benzene) and carbon
monoxide, that are
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.

WARNING

Inhalation of certain dusts, especially
organic dusts such as mold or pollen,
can cause susceptible persons to have
an allergic or asthmatic reaction.

Substantial or repeated inhalation of
dust and other airborne contaminants, in
particular those with a smaller particle
size, may cause respiratory or other
illnesses. Control dust at the source
where possible. Use good work
practices, such as operating the unit so

8

KM 91 R

English

that the wind or operating process
directs any dust raised by the power tool
away from the operator. Follow the
recommendations of
EPA/OSHA/NIOSH and occupational
and trade associations with respect to
dust ("particulate matter"). When the
inhalation of dust cannot be
substantially controlled, i.e., kept at or
near the ambient (background) level, the
operator and any bystanders should
wear a respirator approved by
NIOSH/MSHA for the type of dust
encountered.

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 – press the stop
switch.

WARNING

Never modify your muffler. Any
modification could cause an increase in
heat radiation, sparks or sound level,
thereby increasing the risk of fire, burn
injury or hearing loss. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL servicing dealer only.

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. 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 away from any
combustible substances.

WARNING

An improperly mounted or damaged
cylinder housing or a
damaged/deformed muffler shell may
interfere with the cooling process of the
muffler. 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 muffler is furnished with a spark
arresting screen designed to reduce the
risk of fire from the emission of hot
particles. Never operate your unit with a
missing or damaged spark arresting
screen. If your gas/oil mix ratio is correct
(i.e., not too rich), this screen will
normally stay clean as a result of the
heat from the muffler 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. Some state or federal laws or
regulations may require a properly
maintained spark arrestor for certain
uses. See the "Maintenance, Repair and
Storing" section of these Safety
Precautions. Remember that the risk of
a brush or forest fire is greater in hot or
dry conditions.

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 when using a
catalytic converter,
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.

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, STIHL may deny coverage.

KM 91 R

9

English

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.

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.
Your muffler is equipped with a spark­arresting screen to reduce the risk of
fire; never operate your power tool if the
screen is missing, damaged or clogged.
Remember that the risk of a brush or
forest fire is greater in hot or dry
weather.

In California, it is a violation of § 4442 or

§ 4443 of the Public Resources Code to
use or operate gasoline-powered tools
on forest-covered, brush-covered or
grass-covered land unless the engine’s
exhaust system is equipped with a
complying spark arrester that is
maintained in effective working order.
The owner/operator of this product is
responsible for properly maintaining the
spark arrester. Other states or
governmental entities/agencies, such as
the U.S. Forest Service, may have
similar requirements. Contact your local
fire agency or forest service for the laws
or regulations relating to fire protection
requirements.

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.

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KM 91 R

English

2

002BA098 KN

1

1

5

4

002BA099 KN

2

3

6

7

Approved KombiTools

The following STIHL KombiTools may
be mounted on the KombiMotor:

KombiTool
FS-KM Brushcutter with

FS-KM

FSB-KM Brushcutter with

RG-KM
HL-KM 145° Long reach hedge

HL-KM 0° Long reach hedge

FH-KM 145° Power scythe
BG-KM Blower
HT-KM Pole pruner
BF-KM Cultivator with pick

FBD-KM Redefining bed

FCB-KM Lawn edging
FCS-KM Lawn edging
KB-KM Bristle brush
KW-KM PowerSweep

1)

1)

1)

the barrier bar on the loop handle
supplied with the machine must be
used – see also "Mounting the Loop
Handle"

Application

mowing head
Brushcutter with

grass cutting blade

mowing head
Weeder

trimmer, adjustable

trimmer

tines

edges

Mounting the Loop Handle

A barrier bar is supplied with the
machine. Attach the barrier bar to the
loop handle.

N Insert square nuts (1) in the barrier

bar (2) – the holes must line up

N Insert the clamp (3) in the loop

handle (4) and position them
together on the shaft (5)

N Position clamp (6)
N Position barrier bar (2) – note

position!

N Line up the holes
N Insert bolts (7) in the holes – and

screw them into the barrier bar as
far as possible

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A

9

8

4

002BA353 KN

002BA655 KN

N Fit the loop handle (4) at a distance

of (A) approx. 20 cm (8 in) forward
of the control handle (8)

N Orient the loop handle
N Tighten the bolts – lock the nuts if

necessary

The sleeve (9) is present depending on
the country and must be located
between the loop handle and control
handle.

Always leave the barrier bar attached.

Adjusting the Throttle Cable

It may be necessary to correct the
adjustment of the throttle cable after
assembling the machine or after a
prolonged period of operation.

Adjust the throttle cable only when the
unit is completely and properly
assembled.

N Set the throttle trigger to the full

throttle position.

N Carefully rotate the screw in the

throttle trigger in the direction of the
arrow until you feel initial resistance.
Then rotate it another half turn in the
same direction.

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 two-stroke air
cooled engine oil.

Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.

Fuel with an octane rating below 89 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
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 damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline.

Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.

For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects

engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.

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KM 91 R

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WARNING

To reduce the risk of personal injury
from loss of control and / or contact with
the running cutting tool, do not use your
unit with incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.

If your power tool´s idle speed is
incorrectly adjusted, have your
authorized STIHL servicing dealer
check your machine and make the
proper adjustments and repairs.

The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to
another fuel with a much higher or lower
ethanol content.

This problem can be avoided by always
using fuel with the same ethanol
content.

To ensure the maximum performance of
your STIHL engine, use a high quality 2­cycle engine oil, such as STIHL 2-cycle
engine oils. STIHL 2-cycle engine oils
are specially designed for STIHL
engines. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil, or
use an equivalent high quality 2-cycle
engine oil.

To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil or equivalent.

Do not use NMMA 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,
chain saws, 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 container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.

The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.

The machine’s fuel tank should be
cleaned as necessary.

STIHL MotoMix

STIHL recommends the use of STIHL
MotoMix. STIHL MotoMix has a high
octane rating and ensures that you
always use the right gasoline/oil mix
ratio.

STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil suited for high
performance engines.

For further details, see
www.STIHLusa.com/ethanol

Fuel mix ages

If not using STIHL MotoMix, only mix
sufficient fuel for a few days of work, not
to exceed 30 days of storage. Store in
approved fuel-containers only. When
mixing, pour oil into the container first,
and then add gasoline. Close the
container and shake it vigorously by
hand to ensure proper mix of oil and
gasoline.

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)
20 0.40 (400)

US gal. US fl. oz.

12.6
2 1/2 6.4

512.8
Dispose of empty mixing-oil containers

only at authorized disposal locations.

KM 91 R

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0000-GXX-0476-A0

002BA447 KN

Fueling

WARNING

Removing the cap on a pressurized fuel
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the tank in all directions. The escaping
gasoline, vapors or fumes, sometimes
referred to as fuel spraying or
"geysering," can cause serious personal
injury, including fire and burn injury, or
property damage.

Fuel spraying can occur when the
engine is hot and the tank is opened
while under pressure. It can occur in hot
environments even if the engine has not
been running. Spraying is more likely to
occur when the fuel tank is half full or
more.

Avoid Injuries from Fuel Spraying.
Always follow the fueling instructions in

this manual:
– Treat every fuel tank as if it is

pressurized, particularly if it is half
full or more.

– Always allow the power tool to cool

adequately before attempting to
open the fuel tank or refueling; this
will take longer in hot conditions.

– Never remove the cap by turning it

directly to the open position. Turn it
first approximately 1/2 of a turn
counter-clockwise to relieve any
residual pressure.

– Never open the fuel tank while the

engine is still hot or running.

– Never open the fuel tank or re-fuel

the power tool near any sparks,
flames or other ignition sources.

– Pick the right fuel: use only good

quality (89 octane or higher), fresh
fuel blended for the season.

– Vapor lock: do not remove the fuel

cap in an effort to relieve vapor lock.
Removing the cap has no effect on
vapor lock.

– Be aware that fuel spraying is more

likely at higher altitudes.

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.

WARNING

In order to reduce the risk of fire and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap slowly and carefully so as to allow
any pressure build-up in the tank to
release slowly.

Opening

WARNING

After allowing the power tool to cool,
remove the fuel filler cap slowly and
carefully to allow any remaining
pressure build-up in the tank to release:

N While maintaining steady,

downward pressure, slowly turn the
cap approximately a 1/2 turn
counter-clockwise.

N If any significant venting occurs,

immediately re-seal the tank by
turning the cap clockwise to the
closed position. Allow the power
tool to cool further before attempting
to open the tank.

N Turn the cap to the open position

only after the contents of the tank
are no longer under pressure.

N Remove the fuel filler cap.

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002BA448 KN

2

1

3

0000-GXX-0477-A0

WARNING

Never remove the cap by turning it
directly to the open position. First allow
the power tool to cool adequately and
then release any residual pressure by
slowly turning the cap approximately
1/2 turn counter-clockwise. Never
attempt to remove the cap while the
engine is still hot or running.

Refueling

Take care not to spill fuel while fueling
and do not overfill the tank – leave
approximately 1/2" (13 mm) air space.

Closing

WARNING

An improperly tightened fuel filler cap
can loosen or come off and spill
quantities of fuel. To reduce the risk of
fuel spillage and fire from an improperly
installed fuel cap, tighten the fuel filler
cap by hand with as much force as
possible:

N If your fuel cap still does not tighten

properly, it may be damaged or
broken. Stop using the power tool
and take it to your authorized STIHL
dealer for repair or replacement.

Starting / Stopping the
Engine

Controls

1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop

positions. Depress the stop switch
(…) to switch off the ignition – see
"Function of stop switch and ignition
system".

Function of stop switch and ignition
system

The ignition is switched off and the
engine stopped when the stop switch is
pressed. The stop switch returns
automatically to the Run position when it
is released: The ignition is switched on
again after the engine stops – the engine
is then ready to start.

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0000-GXX-0478-A0

0000-GXX-1319-A0

0000-GXX-1318-A0

0000-GXX-1558-A0

Starting the Engine

N Press the manual fuel pump

bulb (9) at least five times – even if
the bulb is already filled with fuel.

N Press in the choke knob (8) and turn

it to the position that suits the engine
temperature:

g if the engine is cold
< for warm start – also use this posi-

tion if the engine has been running
but is still cold.

The choke knob must engage in
position.

Cranking

N Place the power tool on the ground

so that it rests on the machine
support: Check that the working tool
is not touching the ground or any
other obstacles – see also "Starting
/ Stopping the Engine" in the
KombiTool instruction manual.

N Make sure you have a safe and

secure footing.

N Hold the unit with your left hand and

press it down firmly – your thumb
should be under the fan housing.

NOTICE

Do not stand or kneel on the drive tube.

0000-GXX-1674-A0

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.

N Do not let the starter grip snap back.

Guide it slowly back into the housing
so that the starter rope can rewind
properly.

N Continue cranking until the engine

runs.

As soon as the engine runs

16

N Press down the throttle trigger

lockout and open the throttle – the
choke knob moves to the run
position F. After a cold start, warm
up the engine by opening the
throttle several times.

KM 91 R

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WARNING

There is a risk of injury if the KombiTool
runs when the engine is idling. Adjust
the carburetor so that the KombiTool
does not run when the engine is idling –
see “Adjusting the Carburetor”.

Your machine is now ready for
operation.

Stopping the Engine

N Depress the momentary contact

stop switch – the engine stops –
release the stop switch – it springs
back to the run position.

Other Hints on Starting

Engine stalls in cold start position g or
under acceleration.

N Move the choke knob to < and

continue cranking until the engine
runs.

Engine does not start in warm start
position <

N Move the choke knob to g and

continue cranking until the engine
runs.

If the engine does not start

N Check that all settings are correct.
N Check that there is fuel in the tank

and refuel if necessary.

N Check that the spark plug boot is

properly connected.

N Repeat the starting procedure.

Engine is flooded
N Move the choke knob to F and

continue cranking until the engine
runs.

Fuel tank run until completely dry
N After refueling, press the manual

fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.

N Set the choke lever to suit the

engine temperature.

N Now start the engine.

Operating Instructions

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 the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects engine­mounted components (ignition,
carburetor) from thermal overload.

After Finishing Work

Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-of­service periods – see "Storing the
Machine".

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1

1

0000-GXX-0482-A0

2

3

4

0000-GXX-0495-A0

Replacing the Air Filter

Filters have an average life of more than
a year. Do not remove the filter cover or
replace the air filter as long as there is no
noticeable loss of power.

If there is a noticeable loss of engine
power

N Turn the choke knob to g.
N Loosen the screws (1).
N Remove the filter cover (2).
N Clean away loose dirt from around

the filter.

N Remove the filter element (3).
N Replace dirty or damaged filter

element (3).

N Replace any damaged parts.

Installing the Filter Element

N Install the filter element (3) in the

filter housing and fit the cover.

N Insert the screws (1) and tighten

them down firmly.

Engine Management Adjusting the Carburetor

Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).

The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.

Adjusting Idle Speed

Engine stops while idling
N Warm up the engine for about

3 minutes.

N Turn the idle speed screw (LA)

slowly clockwise until the engine
runs smoothly – the attachment
must not run.

Attachment runs when engine is idling
N Turn the idle speed screw (LA)

slowly counterclockwise until the
cutting attachment stops running
and then turn the screw about
another 1/2 to 3/4 turn in the same
direction.

WARNING

If the attachment continues to run when
the engine is idling, have your machine
checked and repaired by your servicing
dealer.

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0000-GXX-0486-A0

4

5

Spark Arresting Screen in
Muffler

WARNING

To reduce the risk of fire caused by hot
particles escaping from the machine,
never operate the machine without a
spark arresting screen, or with the spark
arresting screen damaged. Do not
modify the muffler or spark arresting
screen.

NOTICE

According to the law or regulations in
some countries or federal states, certain
operations may only be carried out if a
properly serviced spark arresting screen
is provided.

N If the engine is down on power,

check the spark arresting screen in
the muffler.

N Wait for the muffler to cool down.

N Refit the spark arresting screen (5)
N Insert and tighten screw (4)

Spark Plug

If there is a loss of engine power, the
machine is difficult to start or runs poorly
at idle, first check the spark plug.

Install a new spark plug after
approximately 100 operating hours or
earlier if the electrodes are
eroded/corroded.

The 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 degrade performance.

Removing the Spark Plug

1

2

N Loosen screw (4).
N Lift the spark arresting screen (5)

and pull it out.

N Clean the spark arresting

screen (5). If the screen is damaged
or heavily carbonized, install a new
one.

KM 91 R

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0000-GXX 0537-A0

N Remove the cover (1).
N Pull off the spark plug boot (2).
N Unscrew the spark plug (3).

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000BA039 KN

A

2

1

0000-GXX-1831-A0

3

Checking the Spark Plug

N Clean dirty spark plug.
N Check electrode gap (A) and

readjust if necessary – see chapter
"Specifications."

N Use only resistor type spark plugs of

the approved range.

Rectify problems which have caused
fouling of spark plug:

– too much oil in fuel mix,
– dirty air filter,
– unfavorable running conditions, e.g.

operating at part load.

N Press the boot (2) firmly onto the

spark plug.

N Fit the cover (1) and screw it down

firmly.

WARNING

To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press the spark plug
boot (1) snugly onto the spark plug
terminal (2).

Do not use a spark plug with a
detachable SAE adapter terminal (3).
Arcing may occur that could ignite
combustible fumes and cause a fire.
This can result in serious injuries or
damage to property.

N Only use resistor type spark plugs

with solid, non-threaded terminals

Installing the Spark Plug

20

N Screw the spark plug (3) into the

cylinder.

N Tighten down the spark plug (3) with

the combination wrench.

KM 91 R