Stihl KM 94 R User manual

STIHL KM 94 R
Instruction Manual2 - 18

Contents
1 KombiSystem..............................................2
2 Guide to Using this Manual.........................2
3 Safety Precautions and Working Techni‐
ques............................................................ 3
4 Approved KombiTools.................................6
5 Mounting the Loop Handle..........................7
6 Fuel............................................................. 7
7 Fueling........................................................ 8
8 Starting / Stopping the Engine.................... 9
9 Operating Instructions...............................11
10 Replacing the Air Filter..............................12
11 Adjusting the Carburetor........................... 12
12 Spark Plug................................................ 12
13 Storing the Machine.................................. 13
14 Inspection and Maintenance by User........14
15 Inspections and Maintenance by Dealer...14
16 Maintenance and Care..............................15
17 Main Parts.................................................16
18 Specifications............................................17
19 Maintenance and Repairs......................... 18
20 Disposal.................................................... 18
21 EC Declaration of Conformity................... 18
Dear Customer,
Thank you for choosing a quality engineered
STIHL product.
It has been built using modern production techni‐
ques and comprehensive quality assurance.
Every effort has been made to ensure your satis‐
faction 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
1 KombiSystem
In the STIHL KombiSystem a number of different
KombiEngines and KombiTools can be com‐
bined to produce a power tool. In this instruction
manual the functional unit formed by the Kom‐
biEngine 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.
2 Guide to Using this Manual
2.1 Pictograms
The meanings of the pictograms attached to the
machine are explained in this manual.
Depending on the model concerned, the follow‐
ing pictograms may be attached to your
machine.
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
2.2 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.
2.3 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.
English
2 0458-467-8321-C
© ANDREAS STIHL AG & Co. KG 2021
0458-467-8321-C. VA0.J21.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000008157_009_GB

Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual.
3 Safety Precautions and
Working Techniques
Special safety precautions must be
observed when working with a power
tool.
Always read and and make sure you
understand both instruction manuals
(KombiMotor 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.
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 it is operated or attend a
special course in its operation.
Minors should never be allowed to use a power
tool.
Keep bystanders, especially children, and ani‐
mals 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 your power tool without the KombiMotor
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 aggrava‐
ted by strenuous work, check with your doctor
before operating a power tool.
Persons with pacemakers only: The ignition sys‐
tem of your power tool produces an electromag‐
netic field of a very low intensity. This field may
interfere with some pacemakers. STIHL recom‐
mends 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 Kombi‐
Tool 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 prop‐
erly 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 acci‐
dents 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.
3.1 Clothing and Equipment
Wear proper protective clothing and equipment.
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 long hair so
that it is above shoulder level.
See also notes on "Clothing and Equipment" in
the instruction manual of the KombiTool you are
using.
3 Safety Precautions and Working Techniques English
0458-467-8321-C 3

3.2 Transporting the Power Tool
002BA254 KN
Always shut 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.
3.3 Fueling
Gasoline is an extremely flammable
fuel. Keep clear of naked flames. Do
not spill any fuel – do not smoke.
Always shut off the engine before refueling.
Do not fuel a hot engine – fuel may spill and
cause a fire.
Open the fuel cap carefully to allow any pressure
build-up in the tank to release slowly and avoid
fuel spillage.
Fuel your power tool only in well-ventilated
areas. If you spill fuel, wipe the machine immedi‐
ately – if fuel gets on your clothing, change
immediately.
After fueling, tighten down the fuel
tank cap as securely as possible.
This reduces the risk of unit vibrations causing
the fuel cap to loosen or come off and spill quan‐
tities of fuel.
To reduce the risk of serious or fatal burn inju‐
ries, check for fuel leakage. If fuel leak is found,
do not start the engine.
3.4 Before Starting
Check that your power tool is properly assem‐
bled and in good condition – refer to appropriate
chapters in the instruction manuals.
–Check the fuel system for leaks, paying spe‐
cial 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, operate your
power tool only if it is in a safe condition.
If you use a shoulder strap or full harness: Prac‐
tice 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.
3.5 Starting the Engine
Start the engine at least 3 meters from the fuel‐
ing 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 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
English 3 Safety Precautions and Working Techniques
4 0458-467-8321-C

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 combus‐
tible materials (e.g. wood chips, bark, dry grass,
fuel).
See also notes on "Starting / Stopping the
Engine" in the instruction manual of the Kombi‐
Tool you are using.
3.6 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.
002BA080 KN
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.
3.7 During Operation
In the event of impending danger or in an emer‐
gency, 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 regu‐
larly. If the attachment continues to run 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.
Your power tool produces toxic
exhaust fumes as soon as the engine
is running. These fumes may be col‐
orless and odorless and contain
unburned hydrocarbons and ben‐
zene. Never operate the power tool in
enclosed or poorly ventilated loca‐
tions.
To reduce the risk of serious or fatal injury from
breathing toxic fumes, ensure proper ventilation
when working in trenches, hollows or other con‐
fined locations.
To reduce the risk of accidents, stop work imme‐
diately in the event of nausea, headache, visual
disturbances (e.g. reduced field of vision), prob‐
lems with hearing, dizziness, deterioration in abil‐
ity to concentrate. Apart from other possibilities,
these symptoms may be caused by an exces‐
sively 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.
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 condi‐
tions.
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 prop‐
erly. Do not continue operating your power tool if
it is damaged. In case of doubt, consult your
servicing dealer.
3 Safety Precautions and Working Techniques English
0458-467-8321-C 5

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 attach‐
ment.
3.8 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 cir‐
culation (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.
3.9 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 per‐
formed by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized 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 adjust‐
ments.
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 inter‐
vals.
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 con‐
dition, 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.
4 Approved KombiTools
The following STIHL KombiTools may be moun‐
ted on the KombiMotor:
KombiTool Application
FS‑KM Brushcutter with mowing
head
FS‑KM 1) Brushcutter with grass
cutting blade
FSB‑KM Brushcutter with mowing
head
RG-KM 1) Weeder
HL‑KM 145° Long reach hedge trim‐
mer, adjustable
HL‑KM 0° Long reach hedge trim‐
mer
FH‑KM 145° Power scythe
BG‑KM Blower
HT‑KM Pole pruner
BF‑KM Cultivator
FCB‑KM Edger
FCS‑KM 2) Edger
SP‑KM Special Harvester
KB‑KM Bristle brush
KW-KM PowerSweep
1) the barrier bar supplied with the machine must be used – see also "Mounting the Loop Handle"
2) If the FCS-KM is used with the KM 94 R, a flexible shaft must be installed in place of the rigid shaft.
English 4 Approved KombiTools
6 0458-467-8321-C

5 Mounting the Loop Handle
A barrier bar is supplied with the machine. Fit the
barrier bar on the loop handle.
2
1
1
002BA647 KN
► Fit the square nuts (1) in the barrier bar (2);
the holes must line up.
2
5
4
3
6
7
002BA648 KN
► Place the clamp (3) in the loop handle (4) and
position them both against the drive tube (5).
► Position the clamp (6) against the drive tube.
► Place the barrier bar (2) in position as shown.
► Line up the holes.
► Insert the screws (7) in the holes and screw
them into the barrier bar (2) as far as stop.
► Go to "Adjusting and Securing the Loop Han‐
dle".
5.1 Adjusting and Securing the
Loop Handle
4
002BA649 KN
A
The loop handle can be adjusted to suit the
height and reach of the operator and the applica‐
tion by changing distance (A).
Recommendation: distance (A): about 22 cm
(8.7 in)
► Slide the handle to the required position.
► Line up the loop handle (4).
► Tighten 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 neces‐
sary.
Leave the barrier bar permanently mounted to
the loop handle.
6 Fuel
The engine requires a mixture of gasoline and
engine oil.
5 Mounting the Loop Handle English
0458-467-8321-C 7

WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
6.1 STIHL MotoMix
STIHL recommends using STIHL MotoMix. This
pre-blended fuel is free of benzene and lead, is
distinguished by a high octane rating, and
always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for optimum engine life.
MotoMix is not available in all markets.
6.2 Mixing fuel
NOTICE
Unsuitable fuels or a mixing ratio that deviates
from the specification can lead to severe engine
damage. The engine, seals, fuel lines and fuel
tank may be damaged if low-quality gasoline or
engine oil is used.
6.2.1 Gasoline
Use only high-quality gasoline with an octane rat‐
ing of at least 90 ROC – leaded or unleaded.
Gasoline with an alcohol component exceeding
10% can cause impaired engine performance in
engines with manually adjustable carburetors
and thus should not be used in these engines.
Engines with M-Tronic deliver full engine per‐
formance using gasoline with an alcohol compo‐
nent of up to 27% (E27).
6.2.2 Engine oil
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil classified as JASO FB, JASO FC,
JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-
EGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
over the machine’s service life.
6.2.3 Mixing ratio
with STIHL two-stroke engine oil 1:50; 1:50 =
1 part oil + 50 parts gasoline
6.2.4 Examples
Quantity of gaso‐
line
STIHL two-stroke
engine oil 1:50
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)
► Pour oil into an approved safety fuel canister
first, then add gasoline and mix thoroughly
6.3 Storing fuel mixture
Store in approved safety fuel canisters only in a
dry, cool and secure place protected against light
and sunlight.
Fuel mixture deteriorates with age – mix only as
much as needed for a few weeks. Do not store
fuel mixture for longer than 30 days. The fuel
mixture can become unusable more quickly if
exposed to light, sunlight or low or high tempera‐
tures.
STIHL MotoMix however can be stored for up to
5 years without any problems.
► Shake the canister containing the fuel mixture
thoroughly before refueling
WARNING
Pressure may have built up in the canister –
open it carefully.
► The fuel tank and the canister in which fuel
mixture is stored should be cleaned thoroughly
from time to time
Residual fuel and the liquid used for cleaning
must be disposed of in accordance with regula‐
tions and without harming the environment!
7 Fueling
7.1 Fuel filler cap
0208BA019 KN
English 7 Fueling
8 0458-467-8321-C

WARNING
When fueling on a slope, always position the
machine with the filler cap facing uphill.
► Place the machine on level ground so that the
filler cap is facing up.
► Before fueling, clean the filler cap and the area
around it to ensure that no dirt falls into the
tank.
7.2 Open the tank cap.
0208BA020 KN
► Turn the cap counterclockwise until it can be
removed from the tank opening.
► Remove the cap.
7.3 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 noz‐
zle for fuel (special accessory).
► Fill up with fuel.
7.4 Close the tank cap.
0208BA021 KN
► Place the cap in the opening.
► Turn the cap clockwise as far as stop and
tighten it down as firmly as possible by hand.
8 Starting / Stopping the
Engine
8.1 Controls
192BA001 KN
2
1
43
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".
4 Throttle set wheel – limits travel of throttle
trigger – see "Function of throttle set wheel".
8.1.1 Function of Stop Switch and Ignition
System
The ignition is switched off and the engine stop‐
ped 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.
8 Starting / Stopping the Engine English
0458-467-8321-C 9

8.1.2 Function of Throttle Set Wheel
0208BA067 KN
4
The throttle set wheel (4) enables the travel of
the throttle trigger to be preset anywhere
between idle and full throttle.
–Turn throttle set wheel (4) in direction of – to
reduce throttle trigger travel and maximum
engine speed.
–Turn throttle set wheel (4) in direction of + to
increase throttle trigger travel and maximum
engine speed.
–It is possible to override the preset stop and
open the throttle wide by pulling the throttle
trigger firmly – the preset stop remains unaf‐
fected. The original setting is restored when
the throttle trigger is released.
8.2 Starting the Engine
5
0000-GXX-5224-A0
► Press the manual fuel pump bulb (5) at least
five times – even if the bulb is already filled
with fuel.
► Turn throttle set wheel in direction of + as far
as stop.
Cold engine (cold start)
2.
1.
6
0000-GXX-5475-A0
►Turn choke knob (6) and then push it in at g
Also use this setting if the engine has been run‐
ning but is still cold.
Hot engine (hot start)
►Choke knob (6) remains in F position.
8.2.1 Cranking
192BA002 KN
► Place the power tool on the ground so that it
rests on the machine support:
► If fitted: Remove the transport guard from the
cutting attachment.
To reduce the risk of accidents, 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.
► Make sure you have a firm footing, either
standing, stooping or kneeling.
► Hold the unit firmly on the ground with your left
hand and press down – do not touch the throt‐
tle trigger, lockout lever or stop switch.
English 8 Starting / Stopping the Engine
10 0458-467-8321-C

NOTICE
Do not stand or kneel on the shaft.
192BA003 KN
► Hold the starter grip with your right hand.
► Pull the starter grip slowly and steadily.
NOTICE
Do not pull out the starter rope all the way – it
might otherwise break.
► Do not let the starter grip snap back. Guide it
slowly back into the housing so that the starter
rope can rewind properly.
► Continue cranking until the engine runs.
8.2.2 As soon as the engine runs
At temperatures below +10°C
Warm up the engine for at least 10 seconds in
position g.
At temperatures above +10°C
Warm up the engine for at least 5 seconds in
position g.
1191BA025 KN
► Depress throttle trigger lockout and pull the
throttle trigger – the choke knob moves to the
Run F position.
Warm up a cold engineat varying speeds.
WARNING
Make sure the carburetor is correctly adjusted.
The working tool must not rotate when the
engine is idling.
Your machine is now ready for operation.
8.3 Stopping the Engine
► Depress the momentary contact stop switch –
the engine stops – release the stop switch – it
springs back to the run position.
8.4 Other Hints on Starting
Engine stalls in cold start position g.
► Depress throttle trigger lockout and pull the
throttle trigger – the choke knob moves to the
run position F.
►Continue cranking in position F until the engine
runs.
Running engine stalls in cold start position g or
under acceleration.
►Continue cranking in position F until the engine
runs.
If the engine does not start
► Check that all settings are correct.
► Check that there is fuel in the tank and refuel if
necessary.
► Check that the spark plug boot is properly con‐
nected.
► Repeat the starting procedure.
Fuel tank run until completely dry
► After refueling, depress the manual fuel pump
bulb at least five times – even if the bulb is
already filled with fuel.
► Set the choke knob according to engine tem‐
perature.
► Now start the engine.
9 Operating Instructions
9.1 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 dur‐
ing 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.
9 Operating Instructions English
0458-467-8321-C 11

9.2 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.
9.3 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".
10 Replacing the Air Filter
Do not remove the filter cover or replace the air
filter as long as there is no noticeable loss of
power.
10.1 If there is a noticeable loss of
engine power
1
1
2
34
6162BA007 AM
►Turn the choke knob to g.
► Take out the screws (1).
► Remove the filter cover (2).
► Clean away loose dirt from around the filter.
► Remove the filter element (3).
► Replace dirty or damaged filters.
► Replace any damaged parts.
► Fit the new air filter in the filter housing (4).
► Fit the filter cover.
► Fit the screws and tighten them down firmly.
11 Adjusting the Carburetor
0208BA036 KN
The carburetor of the machine has been adjus‐
ted for optimum performance and fuel efficiency
in all operating states at the factory.
11.1 Setting the idle speed
Engine stops when idling
► Slowly turn idle speed screw (LA) clockwise
until the engine runs smoothly – the working
tool must not move along
Working tool turns when idling
► Turn 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.
12 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit 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 "Specifica‐
tions".
English 10 Replacing the Air Filter
12 0458-467-8321-C

12.1 Removing the spark plug
1
0208BA037 KN
2
► Turn screw (1) in cap (2) until cap can be
removed
► Lay down cap
3
0208BA038 KN
► Pull off the spark plug boot (3)
► Unscrew spark plug,
12.2 Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
–Too much oil in fuel mix.
–Dirty air filter.
–Unfavorable running conditions.
1
000BA045 KN
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 inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
12.3 Installing the Spark Plug
► Fit the spark plug and tighten it down firmly.
► Press the boot firmly onto the spark plug.
1
2
0208BA039 KN
► Fit the cap (1), insert the screw (2) and tighten
it down firmly.
13 Storing the Machine
For periods of 30 days or longer
► Drain and clean the fuel tank in a well ventila‐
ted area.
► Dispose of fuel properly in accordance with
local environmental requirements.
► If a manual fuel pump is fitted: Press the man‐
ual fuel pump at least 5 times.
► Start the engine and run it at idling speed until
it stops.
► Thoroughly clean the machine – pay special
attention to the air filter.
► Remove, clean and check the attachment.
Coat metal parts with corrosion inhibiting oil.
13 Storing the Machine English
0458-467-8321-C 13

► Store the machine in a dry and secure location
Keep out of the reach of children and other
unauthorized persons.
14 Inspection and Mainte‐
nance by User
14.1 Throttle Cable
14.1.1 Checking adjustment of throttle cable
Error: Engine speed increases when only the
throttle trigger is depressed.
2
1191BA023 KN
1
► Start the engine.
► Depress 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.
► Shut off the engine.
► Have throttle cable adjusted by your dealer.
STIHL recommends an authorized STIHL
servicing dealer.
14.2 Spark arresting screen in muf‐
fler
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.
If the engine is down on power, check the spark
arresting screen in the muffler.
► Wait for the muffler to cool down
1191BA017 KN
1
2
► Undo screw (1)
► Lift the spark arresting screen (2) and pull it
out.
► Clean the spark arresting screen. If the screen
is damaged or heavily carbonized, fit a new
one
► Refit the spark arresting screen
► Insert and tighten the screw
15 Inspections and Mainte‐
nance by Dealer
15.1 Maintenance work
STIHL recommends that all maintenance and
repairs be carried out by STIHL dealers.
15.2 Fuel pickup body in tank
0208BA044 KN
► Check the pickup bodies in the fuel tank annu‐
ally and have them replaced when necessary
The pickup bodies should be located in the tank
in the areas shown in the figure.
15.3 Spacer, shim
WARNUNG
To reduce the risk of damage to persons or
objects from contact with hot parts, never oper‐
ate the machine without a spacer, or with the
spacer damaged.
English 14 Inspection and Maintenance by User
14 0458-467-8321-C

1191BA018 KN
The spacer (arrow) is integrally molded to the
cover.
► Check the spacer (1) for damage.
► If the spacer (1) is damaged, have the cover
replaced immediately.
15.4 Antivibration element
0208BA045 KN
A vibration-absorbing rubber element is installed
between the powerhead and the shaft. Have it
checked in the event of noticeable wear or con‐
stantly increased vibration.
16 Maintenance and Care
The following intervals apply for normal operating
conditions. The specified intervals must be short‐
ened accordingly when working for longer than nor‐
mal or under difficult cutting conditions (extensive
dust, etc.).
Before starting work
At the end of work and/or daily
Whenever tank is refilled
Weekly
Monthly
Annually
If faulty
If damaged
As required
Complete machine Visual inspection (safe
condition, leaks)
X X
Clean X
Replace any damaged
parts
X
Control handle Function test X X
Air filter Visual inspection X X
Clean the filter housing X
Replace the felt filter1) X X
Fuel tank Clean XXX
Manual fuel pump (if
present)
Check X
Have repaired by a spe‐
cialist dealer2)
X
Fuel pickup body in fuel
tank
Have checked by
dealer2)
X
Have replaced by serv‐
icing dealer2)
X X X
Carburetor Check idle adjustment,
the work tool must not
turn
X X
Adjust idle speed X
Spark plug Set electrode gap X
16 Maintenance and Care English
0458-467-8321-C 15

The following intervals apply for normal operating
conditions. The specified intervals must be short‐
ened accordingly when working for longer than nor‐
mal or under difficult cutting conditions (extensive
dust, etc.).
Before starting work
At the end of work and/or daily
Whenever tank is refilled
Weekly
Monthly
Annually
If faulty
If damaged
As required
Replace after every 100
hours of operation
Intake port for cooling air Visual inspection X
Clean X
Cylinder fins Have cleaned by
dealer2)
X
Spark arresting screen in
muffler
Check if installed X
Check or replace2) X
Spacer molded to the
cover Check3) X
Have hood replaced by
dealer2)
X X
All accessible screws,
nuts and bolts (not
adjusting screws)
Tighten X
Anti-vibration elements Visual inspection4) X X X
Have replaced by serv‐
icing dealer2)
X
Safety information label replace X
1)Only if there is a noticeable loss of engine power2)STIHL recommends STIHL dealers3)see chapter
"Inspections and Maintenance by Dealer", section "Spacer"4)see chapter "Inspection and Mainte‐
nance by Dealer", section "Antivibration Elements"
17 Main Parts
20
16
15
13
14 12 11
10
0000-GXX-5496-A0
8
9
2
5
4
36
7
#
17
18
19
#
1
1 Manual fuel pump
2 Choke knob
3 Carburetor adjusting screw
4 Tank cap
5 Fuel tank
6 Starter grip
7 Muffler with spark arresting screen
8 Throttle trigger
9 Set wheel
10 Stop switch
11 Throttle trigger lockout
12 Carrying ring
13 Loop handle
14 Barrier bar
15 Coupling sleeve
English 17 Main Parts
16 0458-467-8321-C

16 Wing screw
17 Spark plug boot with cap
18 Air filter cover
19 Machine support
20 Spacer on shroud
# Serial number
18 Specifications
18.1 Engine
Single cylinder two-stroke engine
Displacement: 24.1 cc
Bore: 35 mm
Stroke: 25 mm
Engine power to ISO 8893: 0.9 kW (1.2 bhp) at
8,500 rpm
Idle speed: 2,800 rpm
Cut-off speed (rated): 9,800 rpm
18.2 Ignition System
Electronic magneto ignition
Spark plug (resistor type): NGK CMR 6 H
Electrode gap: 0.5 mm
18.3 Fuel system
All position rotary valve carburetor with integral
fuel pump
Fuel tank capacity: 540 cc (0.54 l)
18.4 Weight
dry, without KombiTool
KM 94 RC-E: 4.0 kg
18.5 Features
C Convenience features
R Loop handle
E ErgoStart
18.6 Noise and Vibration Data
18.6.1 with KombiTool
For version see "Approved KombiTools".
For further details on compliance with Vibration
Directive 2002/44/EC visit www.stihl.com/vib.
Noise and vibration data measurements include
idling and rated maximum speed in the following
ratios.
FCB‑KM, FCS‑KM, FH‑KM, FS‑KM,
FSB-KM, RG-KM and HT‑KM
1 to 1
HL‑KM 1 to 4
BF‑KM, BG‑KM, KB‑KM, KW‑KM
and SP‑KM
1 to 6
The exact noise and vibration specifications
depend on the KombiTool being used and are
described in the KombiTool’s instruction manual.
Sound pressure level Lpeq to ISO 10517,
ISO 11201, ISO 11789, ISO 22868
91 dB(A) ... 95 dB(A)
Sound power level Lw to ISO 22868
104 dB(A) ... 109 dB(A)
Sound power level Lweq to ISO 10517,
ISO 11201, ISO 11789
104 dB(A) ... 106 dB(A)
Vibration measurement ahv,eq to ISO 22867
Handle, left
2.9 m/s2 ... 8.2 m/s2
Handle, right
3.6 m/s2 ... 6.9 m/s2
The K‑factor in accordance with Directive
2006/42/EC is 2.0 dB(A) for the sound pressure
level and sound power level; the K‑factor in
accordance with Directive 2006/42/EC is
2.0 m/s2 for the vibration level.
18.7 REACH
REACH is an EC regulation and stands for the
Registration, Evaluation, Authorisation and
Restriction of Chemical substances.
For information on compliance with the REACH
regulation (EC) No. 1907/2006 see
www.stihl.com/reach.
18.8 Exhaust Emissions
The CO2value measured in the EU type approval
procedure is specified at www.stihl.com/co2.
The measured CO2value was determined on a
representative engine in accordance with a
standardized test procedure under laboratory
conditions and does not represent either an
explicit or implied guarantee of the performance
of a specific engine.
The applicable exhaust emission requirements
are fulfilled by the intended usage and mainte‐
nance described in this instruction manual. The
type approval expires if the engine is modified in
any way.
18 Specifications English
0458-467-8321-C 17

19 Maintenance and Repairs
Users of this machine may only carry out the
maintenance and service work described in this
user manual. All other repairs must be carried
out by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
When repairing the machine, only use replace‐
ment parts which have been approved by STIHL
for this power tool or are technically identical.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine.
STIHL recommends the use of original STIHL
replacement parts.
Original STIHL parts can be identified by the
STIHL part number, the { logo and the
STIHL parts symbol K (the symbol may appear
alone on small parts).
20 Disposal
Observe all country-specific waste disposal rules
and regulations.
000BA073 KN
STIHL products must not be thrown in the gar‐
bage can. Take the product, accessories and
packaging to an approved disposal site for envi‐
ronment-friendly recycling.
Contact your STIHL servicing dealer for the lat‐
est information on waste disposal.
21 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare under our sole responsibility that
Designation: KombiEngine
Make: STIHL
Series: KM 94 RC-E
Serial identification number: 4149
Displacement 24.1cm3
conforms to the relevant provisions of Directives
2011/65/EU, 2006/42/EC and 2014/30/EU and
has been developed and manufactured in com‐
pliance with the following standards in the ver‐
sions valid on the date of production:
EN ISO 12100, EN 55012, EN 61000‑6‑1 (in
conjunction with the following KombiTools:
BF‑KM, BG‑KM, FCB‑KM, FCS‑KM, FH‑KM,
FS‑KM, FSB‑KM, RG-KM, HL‑KM, HT‑KM,
KB‑KM, KW‑KM and SP-KM).
The KombiEngine described here may be oper‐
ated only in conjunction with the KombiTools
approved by STIHL for use with this KombiEn‐
gine.
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
Produktzulassung
The year of manufacture and serial number are
applied to the product.
Done at Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory
Affairs
English 19 Maintenance and Repairs
18 0458-467-8321-C

21 EC Declaration of Conformity English
0458-467-8321-C 19

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0458-467-8321-C