Stihl KM 94 R User manual

{
STIHL KM 94 R Instruction Manual
Notice d’emploi

GInstruction Manual
1 - 23
FNotice d’emploi
24 - 50

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2018 0458-467-8221-B. VA0.L17. 0000008158_001_GB
KM 94 R
English
1
{This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
Contents
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It has been built using modern
production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and trouble-free use of
the product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
KombiSystem 2
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Approved KombiTools 7
Mounting the Loop Handle 7
Fuel 8
Fueling 9
Starting / Stopping the Engine 10
Operating Instructions 12
Replacing the Air Filter 13
Engine Management 13
Adjusting the Carburetor 13
Spark Plug 14
Storing the Machine 15
Inspection and Maintenance by
User 15
Inspections and Maintenance by
Dealer 16
Maintenance and Care 17
Main Parts 19
Specifications 20
Maintenance and Repairs 21
Disposal 21
STIHL Limited Emission Control
Warranty Statement 22

KM 94 R
English
2
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.
Therefore, the separate instruction
manuals for the KombiEngine and
KombiTool should be used together for
the power tool.
Always read and 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 the machine are explained in
this manual.
Depending on the model concerned, the
following pictograms may be attached to
your machine.
Symbols in text
WARNING
Warning where there is a risk of an
accident or personal injury or serious
damage to property.
NOTICE
Caution where there is a risk of
damaging the machine or its individual
components.
Engineering improvements
STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.
Therefore, some changes, modifications
and improvements may not be covered
in this manual.
KombiSystem
.
.
.
.
002BA530 KN
+
+
Guide to Using this Manual
Fuel tank; fuel mixture of
gasoline and engine oil
Operate decompression
valve
Manual fuel pump
Operate manual fuel
pump
Tube of grease
Intake air: Summer
operation
Intake air: Winter
operation
Handle heating

KM 94 R
English
3
Observe all applicable local safety
regulations, standards and ordinances.
If you have not used this type of power
tool before: Have your dealer or other
experienced user show you how to
operate your machine or attend a
special course in its operation.
Minors should never be allowed to use a
power tool.
Keep bystanders, especially children,
and animals away from the work area.
When the power tool is not in use, shut it
off so that it does not endanger others.
Secure it against unauthorized use.
The user is responsible for avoiding
injury to third parties or damage to their
property.
Lend or rent your power tool only to
persons who are familiar with this model
and its operation – do not lend of rent
your power tool without the
KombiEngine and KombiTool instruction
manuals.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
To operate the power tool you must be
rested, in good physical condition and
mental health.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.
Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. STIHL
recommends that persons with
pacemakers consult their physician and
the pacemaker manufacturer to reduce
any health risk.
Do not operate the power tool if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
Use your power tool only for the
applications described in the instruction
manual of the KombiTool you are using.
Do not use your power tool for any other
purpose because of the increased risk of
accidents.
Do not operate the KombiEngine without
a properly mounted KombiTool since
this may result in damage to the
machine.
Only use KombiTools and accessories
that are explicitly approved for this
power tool by STIHL or are technically
identical. It is important that you read the
chapter on "Approved KombiTools". If
you have any questions in this respect,
consult a servicing dealer. Use only high
quality tools and accessories in order to
avoid the risk of accidents and damage
to the machine.
STIHL recommends the use of genuine
STIHL tools and accessories. They are
specifically designed to match the
product and meet your performance
requirements.
Never attempt to modify your power tool
in any way since this may increase the
risk of personal injury. STIHL excludes
all liability for personal injury and
damage to property caused while using
unauthorized attachments.
Do not use a pressure washer to clean
your power tool. The solid jet of water
may damage parts of the power tool.
Clothing and Equipment
Wear proper protective clothing and
equipment.
See also notes on "Clothing and
Equipment" in the instruction manual of
the KombiTool you are using.
Safety Precautions and
Working Techniques
Special safety precau-
tions must be observed
when working with a
power tool.
Always read and and
make sure you under-
stand both instruction
manuals (KombiEngine
and KombiTool) before
using your power tool for
the first time and keep
them in a safe place for
future reference. Non-
observance of the safety
precautions may result in
serious or even fatal
injury.
Avoid clothing that could
get caught on branches
or brush or moving parts
of the machine. Do not
wear a scarf, necktie or
jewelry. Tie up and con-
fine long hair (e.g. with a
hair net, cap, hard hat,
etc.).

KM 94 R
English
4
Transporting the Power Tool
Always turn off the engine.
Transporting by vehicle: Properly secure
your power tool to prevent turnover, fuel
spillage and damage.
See also notes on "Transporting the
Machine" in the instruction manual of the
KombiTool you are using.
Fueling
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.
Fuel your power tool only in well-
ventilated areas. If you spill fuel, wipe
the machine immediately – if fuel gets on
your clothing, change immediately.
This reduces the risk of unit vibrations
causing the fuel cap to loosen or come
off and spill quantities of fuel.
To reduce the risk of serious or fatal
burn injuries, check for fuel leakage. If
fuel leakage is found, do not start or run
the engine until leak is fixed.
Before Starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manuals.
–Check the fuel system for leaks,
paying special attention to visible
parts such as the tank cap, hose
connections and the manual fuel
pump (on machines so equipped). If
there are any leaks or damage, do
not start the engine – risk of fire.
Have your machine repaired by a
servicing dealer before using it
again.
–Use only an approved combination
of cutting attachment, deflector,
handle and harness. All parts must
be assembled properly and
securely.
–The stop switch must move freely.
–Smooth action of choke knob,
throttle trigger lockout and throttle
trigger – the throttle trigger must
return automatically to the idle
position. The choke knob must
spring back from the g position to
the run positionF when the throttle
trigger lockout and throttle trigger
are squeezed.
–Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
–Never attempt to modify the controls
or safety devices in any way.
–Keep the handles dry and clean –
free from oil and dirt – for safe
control of the power tool.
–Adjust harness and handle to suit
your height and reach.
To reduce the risk of accidents, do not
operate your power tool if it is damaged
or not properly assembled.
If you use a shoulder strap or full
harness: Practice removing and putting
down the machine as you would in an
emergency. To avoid damage, do not
throw the machine to the ground when
practicing.
See also notes on "Before Starting" in
the instruction manual of the KombiTool
you are using.
Start the engine.
Start the engine at least 3meters from
the fueling spot, outdoors only.
Place the unit on firm ground in an open
area. Make sure you have good balance
and secure footing. Hold the unit
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
002BA254 KN
After fueling, tighten
down the fuel tank cap as
securely as possible.

KM 94 R
English
5
securely. The attachment must be clear
of the ground and all other obstructions
because it may begin to run when the
engine starts.
To reduce the risk of injury, avoid
contact with the attachment.
Do not drop start the power tool – start
the engine as described in the
instruction manual. Note that the
attachment continues to run for a short
period after you let go of the throttle
trigger – flywheel effect.
Check idle speed setting: The
attachment must be stationary when the
engine is idling with the throttle trigger
released.
To reduce the risk of fire, keep hot
exhaust gases and hot muffler away
from easily combustible materials (e.g.
wood chips, bark, dry grass, fuel).
See also notes on "Starting / Stopping
the Engine" in the instruction manual of
the KombiTool you are using.
Holding and Controlling the Power Tool
Always hold the power tool firmly with
both hands on the handles.
Make sure you always have good
balance and secure footing.
Left hand on loop handle, right hand on
control handle, even if you are left-
handed.
On the HT-KM KombiTool, use the
handle hose as the left handle.
During Operation
In the event of impending danger or in
an emergency, switch off the engine
immediately – move the stop switch in
the direction of0.
The correct engine idle speed is
important to ensure that the attachment
stops moving when you let go of the
throttle trigger.
Check and correct the idle speed setting
regularly. If the attachment continues to
move when the engine is idling, have
your dealer check the machine and
make proper adjustments or repairs.
STIHL recommends an authorized
STIHL servicing dealer.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
To reduce the risk of accidents, take a
break in good time to avoid tiredness or
exhaustion.
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert so as not to endanger
others.
Use your power tool only for those
applications described in the KombiTool
instruction manual.
To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.
To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.
Operate your power tool so that it
produces a minimum of noise and
emissions – do not run the engine
unnecessarily, accelerate the engine
only when working.
002BA080 KN
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These fumes
may be colorless and
odorless and contain
unburned hydrocarbons
and benzol. Never oper-
ate the power tool in
enclosed or poorly venti-
lated locations.

KM 94 R
English
6
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.
The dusts, vapor and smoke produced
during operation may be dangerous to
health. Wear a suitable respirator in very
dusty or smoky conditions.
If your power tool is subjected to
unusually high loads for which it was not
designed (e.g. heavy impact or a fall),
always check that it is in good condition
before continuing work – see also
"Before Starting".
Check the fuel system in particular for
leaks and make sure the safety devices
are working properly. Do not continue
operating your power tool if it is
damaged. In case of doubt, consult your
servicing dealer.
Before leaving the power tool
unattended: Shut off the engine.
To reduce the risk of injury, always shut
off the engine before changing the
KombiTool or attachment.
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands (whitefinger
disease).
No general recommendation can be
given for the length of usage because it
depends on several factors.
The period of usage is prolonged by:
–Hand protection (wearing warm
gloves)
–Work breaks
The period of usage is shortened by:
–Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, tingling
sensations).
–Low outside temperatures.
–The force with which the handles
are held (a tight grip restricts
circulation).
Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.
Maintenance and Repairs
Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the instruction manual.
Have all other work performed by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
Only use high-quality replacement parts
in order to avoid the risk of accidents
and damage to the machine. If you have
any questions in this respect, consult a
servicing dealer.
STIHL recommends the use of original
STIHL replacement parts. They are
specifically designed to match your
model and meet your performance
requirements.
To reduce the risk of injury from
unintentional engine startup, always
shut off the engine and disconnect the
spark plug boot before performing any
repairs, maintenance or cleaning work. –
Exception: Carburetor and idle speed
adjustments.
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed since there is otherwise a
risk of fire from uncontained sparking.
To reduce the risk of fire, do not service
or store your machine near open flames.
Check the fuel filler cap for leaks at
regular intervals.
Use only a spark plug of the type
approved by STIHL and make sure it is
in good condition – see "Specifications".
Inspect the ignition lead (insulation in
good condition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to
hearing, do not operate your machine if
the muffler is damaged or missing. –
Do not touch a hot muffler since burn
injury will result.
Vibration behavior is influenced by the
condition of the AV elements – check the
AV elements at regular intervals.
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.

KM 94 R
English
7
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual. The following STIHL KombiTools may
be attached to the KombiEngine:
A barrier bar is supplied with the
machine. Fit the barrier bar on the loop
handle.
NFit the square nuts(1) in the barrier
bar(2); the holes must line up.
Approved KombiTools
KombiTool
1) The included bracket (barrier bar)
on the loop handle must be used -
see also "Fit loop handle”
Intended use:
FS-KM Trimmer with mow-
ing head
FS-KM1) Trimmer with grass
cutting blade
FSB-KM Trimmer with mow-
ing head
HL-KM145° Hedge trimmer,
adjustable
HL-KM0° Hedge trimmer
FH-KM145° Scrub cutter
BG-KM Blower
HT-KM Pole pruner
BF-KM Soil cultivator
FBD-KM Cutting bed edges
FCB-KM Cutting lawn edges
FCS-KM Cutting lawn edges
KB-KM Bristle brush
KW-KM Sweeper drum
assembly
Mounting the Loop Handle
2
1
1
002BA647 KN

KM 94 R
English
8
NPlace the clamp(3) in the loop
handle(4) and position them both
against the drive tube(5).
NPosition the clamp(6) against the
drive tube.
NPlace the barrier bar(2) in position
as shown.
NLine up the holes.
NInsert the screws(7) in the holes
and screw them into the barrier
bar(2) as far as stop.
NGo to "Adjusting and Securing the
Loop Handle".
Adjusting and Securing the Loop Handle
The loop handle can be adjusted to suit
the height and reach of the operator and
the application by changing
distance(A).
Recommendation: distance(A):
about22cm (8.7in)
NSlide the handle to the required
position.
NLine up the loop handle(4).
NTighten down the screws until the
loop handle can no longer be
rotated on the drive tube. If no
barrier bar is fitted – lock the nuts if
necessary.
Leave the barrier bar permanently
mounted to the loop handle.
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of high-
quality premium gasoline and high-
quality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 (R+M)/2.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
2
5
4
3
6
7
002BA648 KN
4
002BA649 KN
A
Fuel

KM 94 R
English
9
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke air-
cooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
To ensure the maximum performance of
your STIHL engine, use a high quality 2-
cycle engine oil. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil or ask
your dealer for an equivalent fully
synthetic 2-cycle engine oil.
To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped with a catalytic converter.
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The fuel tank and the canister in which
fuel mix is stored should be cleaned
from time to time.
Fuel mix ratio
Only mix sufficient fuel for a few days
work, not to exceed 30days of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Fuel filler cap
WARNING
When fueling on a slope, always position
the machine with the filler cap facing
uphill.
NPlace the machine on level ground
so that the filler cap is facing up.
NBefore fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
liters liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Fueling
0208BA019 KN

KM 94 R
English
10
Open the tank cap.
NTurn the cap counterclockwise until
it can be removed from the tank
opening.
NRemove the cap.
Filling up with fuel
Take care not to spill fuel while fueling
and do not overfill the tank.
STIHL recommends you use the STIHL
filler nozzle for fuel (special accessory).
NFill up with fuel.
Close the tank cap.
NPlace the cap in the opening.
NTurn the cap clockwise as far as
stop and tighten it down as firmly as
possible by hand.
Operating elements
1Throttle lever lock
2Throttle lever
3Stop switch – with settings for Run
and Stop. To switch off the ignition
system, the stop switch (…) must
be pressed – see "Function of the
stop switch and the ignition"
4Thumb wheel – to limit the throttle
path – see "Function of the thumb
wheel"
Function of the stop switch and the
ignition
If the stop switch is actuated, the ignition
is switched off and the engine is
switched off. When released, the stop
switch automatically returns to the Run
position: After the engine has stopped,
the ignition is automatically switched on
again in the Run position – the engine is
ready for starting and can be started.
Function of the thumb wheel
The thumb wheel (4) is used to set the
throttle path infinitely between idling and
full throttle and therefore also the engine
speed range:
–Turn thumbwheel (4) in – direction:
the throttle path is shorter and the
set maximum engine speed is lower
–Turn thumbwheel (4) in + direction:
the throttle path is longer and the set
maximum engine speed is higher
–Press the throttle trigger forcefully to
apply full throttle even if limitation
set– the set limitation is maintained–
when the throttle trigger is released,
it is back in the preset range.
0208BA020 KN
0208BA021 KN
Starting / Stopping the
Engine
192BA001 KN
2
1
43
0208BA067 KN
4

KM 94 R
English
11
Starting the engine
NPress the fuel pump bulb(5) at least
5times - even when bulb is filled
with fuel
NTurn thumb wheel as far as possible
in the direction+
Cold engine (cold start)
NTurn the knob for start throttle(6)
and then press to g
Also use this setting if the engine has
been running but is still cold.
Hot engine (hot start)
NThe knob for startthrottle (6)
remains in position F
Actuating
NPlace the machine on the ground so
that it rests securely on the engine
support:
N(if present): Remove the transport
guard on the cutting attachment
The working tool must not touch the
ground or any other objects – see also
"Starting/stopping the engine" in the
KombiTool Instruction Manual – risk of
accident!
Nsafe standing - possibilities:
standing, bent or kneeling
NPress the machine firmly against
the ground with the left hand – do
not touch the throttle trigger, throttle
trigger lockout or stop switch while
doing so
NOTICE
Do not stand or kneel on the shaft!
NGrab the starter grip with your right
hand
NPull 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
completely – risk of breakage!
NDo not let the starter grip snap back
– guide it slowly back into the
housing so that the starter rope can
rewind properly
Nactuate until the engine starts!
Once the engine is running
At temperatures below +10°C (+50°F)
Allow the machine to warm up in
positiong for at least 10seconds.
At temperatures over +10°C (+50°F)
Allow the machine to warm up in
positiong for approx. 5seconds.
5
0000-GXX-5224-A0
2.
1.
6
0000-GXX-5475-A0
192BA002 KN
192BA003 KN

KM 94 R
English
12
NPress the throttle trigger lockout and
accelerate – the warm start knob
jumps to the run positionF
After a cold start, let the engine warm up
with a few load cycles.
WARNING
If the carburetor has been set correctly,
the working tool should not rotate when
the engine is idling!
The machine is now ready for use.
Shutting down the engine
NPress stop switch – the engine
stops – release stop switch – the
stop switch returns to its original
position
Additional hints on starting
The engine stops in the cold start
positiong.
NPress the throttle trigger lockout and
accelerate – the warm start knob
jumps to the run positionF
Ncontinue cranking in positionF until
the engine runs
The engine that is running in the cold
start positiong then stops while
accelerating.
Ncontinue cranking in position for
cold startg until the engine runs
The engine does not start
NCheck if all operating elements are
set correctly
NCheck whether there is fuel in the
tank and refuel if necessary
NCheck whether the spark plug boot
is connected securely
NRepeat the starting procedure
If the tank has been drained completely
NAfter refueling, press the manual
fuel pump bulb at least fivetimes –
even if it is full of fuel.
NSet knob for warm start depending
on engine temperature
NRestart 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 the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects engine-
mounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-of-
service periods – see "Storing the
Machine".
1191BA025 KN
Operating Instructions

KM 94 R
English
13
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
NTurn the choke knob tog.
NTake out the screws (1).
NRemove the filter cover(2).
NClean away loose dirt from around
the filter.
NRemove the filter element(3).
NReplace dirty or damaged filters.
NReplace any damaged parts.
NFit the new air filter in the filter
housing(4).
NFit the filter cover.
NFit the screws and tighten them
down firmly.
Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
The carburetor of the machine has been
adjusted for optimum performance and
fuel efficiency in all operating states at
the factory.
Setting the idle speed
Engine stops when idling
NSlowly turn idle speed screw(LA)
clockwise until the engine runs
smoothly – the working tool must not
move along
Working tool turns when idling
NTurn the idle speed adjusting
screw(LA) slowly counterclockwise
until the working tool stops turning
WARNING
If the working tool continues to keep
rotating in idle even after adjustment,
have the power tool checked by a
servicing dealer.
Replacing the Air Filter
1
1
2
34
6162BA007 AM
Engine Management Adjusting the Carburetor
0208BA036 KN

KM 94 R
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NIf the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
NFit a new spark plug after about 100
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the spark plug
NTurn screw(1) in cap(2) until cap
can be removed
NLay down cap
NPull off the spark plug boot (3)
NUnscrew spark plug,
Checking the Spark Plug
NClean dirty spark plug.
NCheck electrode gap(A) and
readjust if necessary – see
"Specifications".
NRectify the problems which have
caused fouling of the spark plug.
Possible causes are:
–Too much oil in fuel mix.
–Dirty air filter.
–Unfavorable running conditions.
WARNING
Arcing may occur if the adapter nut (1) is
loose or missing. Working in an easily
combustible or explosive atmosphere
may cause a fire or an explosion. This
can result result in serious injuries or
damage to property.
NUse resistor type spark plugs with a
properly tightened adapter nut.
Installing the spark plug
NFit the spark plug and tighten it
down firmly
NPress spark plug boot firmly onto
spark plug
NFit cap(1), insert and tighten
screw(2)
Spark Plug
1
0208BA037 KN
2
3
0208BA038 KN
000BA039 KN
A
1
000BA045 KN
1
2
0208BA039 KN

KM 94 R
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For periods of 3months or longer
NDrain and clean the fuel tank in a
well ventilated area.
NDispose of fuel properly in
accordance with local
environmental requirements.
NRun the engine until the carburetor
is dry – this helps prevent the
carburetor diaphragms sticking
together.
NThoroughly clean the machine – pay
special attention to the air filter.
NRemove, clean and check the
attachment. Coat metal parts with
corrosion inhibiting oil.
NStore the machine in a dry and
secure location Keep out of the
reach of children and other
unauthorized persons.
Throttle Cable
Checking adjustment of throttle cable
Error: Engine speed increases when
only the throttle trigger is depressed.
NStart the engine.
NDepress the throttle trigger(1) – do
not press down the throttle trigger
lockout(2).
If the engine speed increases or if the
cutting attachment rotates, the throttle
cable has to be adjusted.
NShut off the engine.
NHave throttle cable adjusted by your
dealer. STIHL recommends an
authorized STIHL servicing dealer.
Spark Arresting Screen in Muffler
If the engine is down on power, check
the spark arresting screen in the muffler.
NWait for the muffler to cool down.
NTake out the screw(1).
NLift the spark arresting screen(2)
and pull it out.
NClean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one.
NRefit the spark arresting screen.
NInsert the screw and tighten it down
firmly.
Storing the Machine Inspection and Maintenance
by User
2
1191BA023 KN
1
1191BA017 KN
1
2

KM 94 R
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16
Maintenance Work
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
Fuel Pickup Body in Tank
NCheck the pickup body in the fuel
tank every year and have it replaced
if necessary.
The pickup body should be positioned in
the area of the tank shown in the
illustration.
Spacer
The spacer(arrow) is integrally molded
to the shroud.
NCheck spacer(1) for damage.
NIf spacer(1) is damaged, have
shroud replaced immediately.
Antivibration Element
A vibration-absorbing rubber element is
installed between the powerhead and
the drive tube. Have it checked if there
are signs of wear or a noticeable
increase in vibration levels.
Inspections and Maintenance
by Dealer
0208BA044 KN
1191BA018 KN
0208BA045 KN

KM 94 R
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17
Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.),
shorten the specified intervals accordingly.
before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required
Complete machine
Visual inspection (condition, leaks) XX
Clean X
Replace any damaged parts X
Control handle Check operation XX
Air filter
Visual inspection XX
Clean filter housing X
Replace felt filter1) XX
Fuel tank Clean XXX
Manual fuel pump (if fitted) Check X
Have repaired by servicing dealer2) X
Pickup body in fuel tank Have checked by servicing dealer2) X
Have replaced by servicing dealer2) XXX
Carburetor
Check idle adjustment – the working/cut-
ting attachment must not run XX
Adjust idle speed X
Spark plug Adjust electrode gap X
Replace after every 100 operating hours
Cooling inlets Visual inspection X
Clean X
Cylinder fins Have cleaned by servicing dealer2) X
Spark arresting screen in muffler Check XX
Clean or replace XX
Spacer molded to shroud
Check3) X
Have shroud replaced by servicing
dealer2) XX

KM 94 R
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Exhaust port
Have decoked by servicing dealer2) after
first 139 hours of operation, then every
150 hours of operation
X
All accessible screws and nuts (not adjust-
ing screws) Retighten X
Anti-vibration elements Visual inspection4) XXX
Have replaced by servicing dealer2) X
Safety labels Replace X
1) Only if there is a noticeable loss of engine power
2) STIHL recommends an authorized STIHL servicing dealer.
3) see chapter "Inspections and Maintenance by Dealer", section "Spacer"
4) see chapter "Inspections and Maintenance by Dealer", section "Antivibration Elements"
The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.),
shorten the specified intervals accordingly.
before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required