Stihl FS 94 R User manual

{
STIHL FS 94 Instruction Manual
Notice d’emploi

GInstruction Manual
1 - 38
FNotice d’emploi
39 - 80

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2015 0458-593-8221-A. VA0.L15. 0000006516_010_GB
FS 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 troublefree use of
the product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 11
Mounting the Loop Handle 12
Fitting the Carrying Ring 14
Mounting the Deflector 14
Mounting the Cutting Attachment 15
Fuel 18
Fueling 19
Fitting the Harness 20
Balancing the Machine 20
Starting / Stopping the Engine 21
Transporting the Unit 24
Operating Instructions 25
Cleaning the Air Filter 25
Engine Management 26
Adjusting the Carburetor 26
Spark Plug 26
Storing the Machine 27
Sharpening Metal Cutting Blades 28
Maintaining the Mowing Head 28
Inspection and Maintenance by
User 29
Inspections and Maintenance by
Dealer 30
Maintenance and Care 31
Main Parts 33
Specifications 35
Maintenance and Repairs 36
Disposal 36
STIHL Limited Emission Control
Warranty Statement 36

FS 94 R
English
2
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.
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.
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
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
Safety Precautions and
Working Techniques
Some special safety pre-
cautions have to be
observed when working
with this power tool
because of the very high
speed of the cutting
attachment.
It is important that you
read the instruction man-
ual before first use and
keep it in a safe place for
future reference. Non-
observance of the
instruction manual may
result in serious or even
fatal injury.

FS 94 R
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3
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.
Depending on the cutting attachment
fitted, use your power tool only for
cutting grass, wild growth, shrubs,
scrub, bushes, small diameter trees and
similar materials.
Do not use your power tool for any other
purpose because of the increased risk of
accidents.
Only use cutting attachments and
accessories that are explicitly approved
for this power tool model by STIHL or
are technically identical. 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 machine 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.
The deflector on this power tool cannot
protect the operator from all objects
thrown by the cutting attachment
(stones, glass, wire, etc.). Such objects
may ricochet and then hit the operator.
Do not use a pressure washer to clean
the unit. The solid jet of water may
damage parts of the unit.
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 and confine long hair
(e.g. with a hair net, cap, hard hat, etc.).
Sturdy shoes with non-slip soles may be
worn as an alternative only when using
mowing heads.
WARNING
Wear a face shield and make sure it is a
good fit. A face shield alone does not
provide adequate eye protection.
Wear hearing protection, e.g. earplugs
or ear muffs.
Wear a safety hard hat for thinning
operations, when working in high scrub
and where there is a danger of head
injuries from falling objects.
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
Clothing must be sturdy
but allow complete free-
dom of movement. Wear
snug-fitting clothing, an
overall and jacket combi-
nation, do not wear a
work coat.
Wear steel-toed safety
boots with non-slip soles.
To reduce the risk of eye
injuries, wear snug-fitting
safety glasses in accord-
ance with European
Standard EN 166. Make
sure the safety glasses
are a good fit.
Wear robust work gloves
made of durable material
(e.g. leather).

FS 94 R
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4
Transporting the Power Tool
Always stop the engine.
Carry the unit hanging from the shoulder
strap or properly balanced by the drive
tube.
To reduce the risk of cut injuries, fit
transport guard on the cutting
attachment, even when carrying the tool
for short distances – see also
"Transporting the Unit".
Transporting by vehicle: Properly secure
your power tool to prevent turnover, fuel
spillage and damage.
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
manual.
–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 / slide control 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.
–Check cutting tool or attachment for
correct and secure assembly and
good condition.
To reduce the risk of seri-
ous burn injuries, avoid
touching hot parts of the
machine, including the
gearbox housing.
0208BA003 KN
0208BA004 KN
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
After fueling, tighten
down the fuel tank cap as
securely as possible.

FS 94 R
English
5
–Check protective devices (e.g.
deflector for cutting attachment,
rider plate) for damage or wear.
Always replace damaged parts. Do
not operate your machine with a
damaged deflector or worn rider
plate (lettering and arrows no longer
legible).
–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 the harness and handle(s) to
suit your height and reach. See
chapters on "Fitting the Harness"
and "Balancing the Machine".
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 power tool as you would in an
emergency. To avoid damage, do not
throw the machine to the ground when
practicing.
Starting 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
securely. The cutting attachment must
be clear of the ground and all other
obstructions because it may begin to run
when the engine starts.
Your power tool is a one-person unit. To
reduce the risk of injury from thrown
objects, do not allow other persons
within a radius of 15 meters of your own
position – even when starting.
Check idle speed setting: The cutting
attachment must not rotate 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).
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.
Models with bike handle
Right handle on control handle, left hand
on left handle.
Models with loop handle
Left hand on loop handle, right hand on
control handle, even if you are left-
handed.
During Operation
Make sure you always have good
balance and secure footing.
In the event of impending danger or in
an emergency, switch off the engine
immediately – move the stop switch /
slide control in the direction of 0.
To reduce the risk of
injury, avoid contact with
the cutting attachment.
Do not drop start the
power tool – start the
engine as described in
the instruction manual.
Note that the cutting
attachment continues to
run for a short period
after you let go of the
throttle trigger – flywheel
effect.
0208BA005 KN
0208BA006 KN

FS 94 R
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6
The cutting attachment may catch and
fling objects a great distance and cause
injury - therefore, do not allow any other
persons within a radius of 15 meters of
your own position. To reduce the risk of
damage to property, also maintain this
distance from other objects (vehicles,
windows). Even maintaining a distance
of 15 meters or more cannot exclude the
potential danger.
The correct engine idle speed is
important to ensure that the cutting
attachment stops rotating when you let
go of the throttle trigger.
Check and correct the idle speed setting
regularly. If the cutting attachment
continues to rotate when the engine is
idling, have the machine checked by
your servicing dealer. STIHL
recommends an authorized STIHL
servicing dealer.
Take special care in slippery conditions
(ice, wet ground, snow), on slopes or
uneven ground.
Watch out for obstacles: Roots and tree
stumps which could cause you to trip or
stumble.
Always stand on the ground while
working, never on a ladder, work
platform or any other insecure support.
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.
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.
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. If the work area is very dusty or
smoky, wear a respirator.
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.
Special care must be taken when
working in difficult, over-grown terrain.
15m (50ft)
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 run
the engine indoors or in
poorly ventilated loca-
tions, even if your model
is equipped with a cata-
lytic converter.
To reduce the risk
of injury from
thrown objects,
never operate the
unit without the
proper deflector for
the type of cutting
attachment being
used.
Inspect the work area:
Stones, pieces of metal
or other solid objects may
be thrown more than 15
meters and cause per-
sonal injury or damage
the cutting attachment
and property (e.g. parked
vehicles, windows).

FS 94 R
English
7
When cutting high scrub, under bushes
and hedges: Keep cutting attachment at
a minimum height of 15 cm to avoid
harming small animals.
Always shut off the engine before
leaving the unit unattended.
Check the cutting attachment at regular
short intervals during operation or
immediately if there is a noticeable
change in cutting behavior:
–Turn off the engine. Hold the unit
firmly and wait for the cutting
attachment to come to a standstill.
–Check condition and tightness, look
for cracks.
–Check sharpness.
–Replace damaged or dull cutting
attachments immediately, even if
they have only superficial cracks.
Clean grass and plant residue off the
cutting attachment mounting at regular
intervals – remove any build up of
material from the cutting attachment and
deflector.
To reduce the risk of injury, shut off the
engine before changing the cutting
attachment.
Do not continue using or attempt to
repair damaged or cracked cutting
attachments by welding, straightening or
modifying the shape (out of balance).
This may cause parts of the cutting
attachment to come off and hit the
operator or bystanders at high speed
and result in serious or fatal injuries.
When using mowing heads
Equip the deflector with the additional
components specified in the instruction
manual.
Use only the deflector with properly
mounted line limiting blade to ensure the
mowing lines are automatically trimmed
to the approved length.
To reduce the risk of injury, always turn
off the engine before adjusting the nylon
line of manually adjustable mowing
heads
Using the unit with over-long nylon
cutting lines reduces the motor's
operating speed. The clutch then slips
continuously and this causes
overheating and damage to important
components (e.g. clutch, polymer
housing components) – and this can
increase the risk of injury from the
cutting attachment rotating while the
engine is idling.
Using metal cutting attachments
STIHL recommends the use of original
STIHL metal cutting attachments. They
are specifically designed to match your
model and meet your performance
requirements.
Metal cutting attachments rotate at very
high speed. The forces that occur act on
the machine, the attachment and the
material being cut.
Sharpen metal cutting attachments
regularly as specified.
Unevenly sharpened metal cutting
attachments cause out-of-balance
which can impose extremely high loads
on the machine and increase the risk of
breakage.
Dull or improperly sharpened cutting
edges can put a higher load on the
cutting attachment and increase the risk
of injury from cracked or broken parts.
Inspect metal cutting attachments for
cracks or warping after every contact
with hard objects (e.g. stones, rocks,
pieces of metal). To reduce the risk of
injury, remove burrs and other visible
build-ups of material (use a file) because
they may become detached and be
thrown at high speed during operation.
If a rotating metal cutting attachment
makes contact with a rock or other solid
object there is a risk of sparking which
may cause easily combustible material
to catch fire under certain
circumstances. Dry plants and scrub are
also easily combustible, especially in hot
and dry weather conditions. If there is a
risk of fire, do not use metal cutting
attachments near combustible
materials, dry plants or scrub. Always
contact your local forest authority for
information on a possible fire risk.
To reduce the above-mentioned risks
when using a metal cutting attachment,
never use a metal cutting attachment
with a diameter larger than specified. It
must not be too heavy. It must be
manufactured from materials of
adequate quality and its geometry must
be correct (shape, thickness).
The gearbox becomes
hot during operation. To
reduce the risk of burn
injury, do not touch the
gearbox housing.

FS 94 R
English
8
To reduce the risk of injury, a metal
cutting attachment not manufactured by
STIHL must not be heavier, thicker,
have a different shape or a diameter
larger than the largest metal cutting
attachment approved by STIHL for this
power tool model.
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.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
Symbols on Deflectors
An arrow on the deflector shows the
correct direction of rotation of the cutting
attachments.
Some of the following symbols are
applied to the outside of the deflector to
indicate the approved combination of
cutting attachment and deflector.

FS 94 R
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9
Shoulder strap
NUse a shoulder strap.
NWith the engine running, attach the
machine to the shoulder strap.
Grass cutting blades must always be
used in combination with a shoulder
strap.
Mowing Head with Nylon Line
Nylon line achieves a soft cut for edging
and trimming around trees, fence posts,
etc. – less risk of damaging tree bark.
The mowing head comes with an
instruction leaflet. Refill the mowing
head with nylon line as described in the
instruction leaflet.
WARNING
To reduce the risk of serious injury,
never use wire or metal-reinforced line in
place of the nylon line.
STIHL Polycut Mowing Head with
Polymer Blades
For mowing unobstructed edges of
meadows (without posts, fences, trees
or similar obstacles).
Deflector may be used
with mowing heads.
Deflector may be used
with grass cutting blades.
Deflector must not be
used with mowing heads.
Do not use deflector with
brush knives, shredder
blades or circular saw
blades.
Do not use deflector with
brush knives, shredder
blades, grass cutting
blades or circular saw
blades.
Deflector may be
used with mow-
ing heads. Not
approved for use
with brush
knives, shredder
blades or circular
saw blades.
Deflector may be
used with mow-
ing heads – do
not use metal cut-
ting attachments.
000BA015 KN

FS 94 R
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10
Check the wear limit marks!
If one of the wear limit marks on the
PolyCut mowing head is worn through
(arrow): Do not continue using the
mowing head. Install a new one. There
is otherwise a risk of injury from thrown
parts of the head.
It is important to follow the maintenance
instructions for the PolyCut mowing
head.
The PolyCut can also be equipped with
mowing line in place of the polymer
blades.
The mowing head comes with
instruction leaflets. Equip the mowing
head with polymers blades or nylon line
as described in the instruction leaflets.
WARNING
Never use wire in place of the nylon
mowing line – risk of injury.
Risk of Kickout (Blade Thrust) with Metal
Cutting Attachments
WARNING
The risk of kickout is greatest when the
black area of the rotating cutting
attachment comes into contact with a
solid object.
Grass Cutting Blade
Use for grass and weeds only – sweep
the brushcutter in an arc like a scythe.
WARNING
Improper use may damage the grass
cutting blade – risk of injury from thrown
parts.
Resharpen the grass cutting blade
according to instructions when it has
dulled noticeably.
002BA049 KN
When using metal cut-
ting attachments there is
a risk of kickout when the
rotating blade comes into
contact with a solid object
such as a tree trunk,
branch, tree stump, rock
or similar. The machine is
thrown to the right or to
the rear – opposite to the
attachment's direction of
rotation.
002BA135 KN
000BA020 KN

FS 94 R
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11
Approved Combinations
Select correct combination from the
table according to the cutting
attachment you intend to use.
WARNING
For safety reasons only the cutting
attachments, deflectors, handles and
harnesses shown in each row of the
table may be used together. No other
combinations are permitted – risk of
accidents.
Cutting attachments
Mowing heads
1STIHL SuperCut 20-2
2STIHL AutoCut 25-2
3STIHL AutoCut 36-2
Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
Cutting Attachment Deflector Handle Shoulder Strap/Harness
14
15 16 17 19
15 16
19
18
0000-GXX-0407-A0
13
11
12
10
12
5
6 7
9
34
8

FS 94 R
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12
4STIHL DuroCut 20-2
5STIHL PolyCut 20-3
Metal cutting attachments
6Grass cutting blade 230-2
(230 mm dia.)
7Grass cutting blade 260-2
(260 mm dia.)
8Grass cutting blade 230-4
(230 mm dia.)
9Grass cutting blade 230-8
(230 mm dia.)
WARNING
Non-metal grass cutting blades are not
approved.
Deflectors
10 Deflector for mowing heads
11 Deflector with
12 skirt and blade, for mowing heads
13 Deflector without skirt and blade, for
metal cutting attachments
Handle
14 Loop handle
15 Loop handle with
16 barrier bar
Harness
17 Shoulder strap may be used
18 Shoulder strap must be used
19 Full harness may be used
Using the Barrier Bar
A barrier bar may have to be mounted to
suit the tool you intend to use – see
"Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness".
The barrier bar comes standard with the
machine or is available as a special
accessory.
Mounting Loop Handle with Barrier Bar
NFit the square nuts (1) in the barrier
bar (2); the holes must line up.
Mounting the Loop Handle
002BA571 KN
2
002BA098 KN
1
1

FS 94 R
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13
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 "Securing the Loop Handle".
Mounting the Loop Handle without
Barrier Bar
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.
NLine up the holes.
NFit washers (8) on the screws (7)
and insert the screws in the holes.
Fit the square nuts (1) and screw
them down as far as stop.
NGo to "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 30 cm (12 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.
5
4
002BA099 KN
2
3
67
7
8
5
4
1
6
1
3
8
7
002BA614 KN
4
002BA570 KN
A

FS 94 R
English
14
Polymer Version
For position of carrying ring see "Main
Parts".
NPush the carrying ring (1) over the
drive tube.
NInsert the M5 nut in the hex recess
in the carrying ring.
NFit the M5x14 screw.
NLine up the carrying ring.
NTighten down the screw firmly.
Metal Version
The carrying ring comes standard with
the machine or is available as a special
accessory.
For position of carrying ring see "Main
Parts".
NPlace the clamp (1) against the
drive tube with the tapped hole on
the left (viewed from engine).
NSqueeze the two ends of the clamp
together and hold in that position.
NInsert the M6x14 screw (2).
NLine up the carrying ring.
NTighten down the screw firmly.
Use the Right Deflector
WARNING
Deflector (A) with skirt and blade is only
approved for mowing heads.
WARNING
Deflector (B) without skirt and blade is
only approved for grass cutting blades.
Fitting the Carrying Ring
1
002BA529 KN
002BA142 KN
1
2
1
Mounting the Deflector
A
002BA572 KN
B
002BA573 KN

FS 94 R
English
15
WARNING
Deflector (C) with blade is only approved
for mowing heads.
Mounting the Deflector
All deflectors are mounted to the
gearbox in the same way.
NPosition deflector (1) or (2) on the
gearbox.
NInsert the screws (3) and tighten
them down firmly.
Fitting the Skirt and Blade
WARNING
These parts must be fitted to the
deflector (1) when you use a mowing
head.
NSlide the lower guide slot of the skirt
(4) onto the deflector (1) – it must
snap into position.
NPush the blade (5) into the upper
guide slot on the skirt and line it up
with the first hole.
NInsert the screw and tighten it down
firmly.
Placing power tool on the ground
NShut off the engine.
NLay your power tool on its back so
that the cutting attachment
mounting face is pointing up.
Fitting the Thrust Plate
The machine comes standard with the
thrust plate.
NSlip the thrust plate (1) over the
shaft (2).
NOTICE
The thrust plate on the gearbox is
necessary for mounting cutting tools.
C
002BA574 KN
002BA380 KN
2
1
3
3
4
1
5
4
002BA103 KN
Mounting the Cutting
Attachment
1191BA026 KN
1
002BA383 KN

FS 94 R
English
16
Mounting Hardware for Cutting
Attachments
The mounting hardware supplied
depends on the cutting attachment that
comes as original equipment with the
new machine.
Machine supplied without mounting
hardware
Only mowing heads may be used which
mount directly to the shaft (2).
Machine supplied with mounting
hardware
Mowing heads and metal cutting
attachments may be mounted.
Depending on the cutting attachment, it
may be necessary to use the nut (3),
rider plate (4) and thrust washer (5).
These parts are included in a kit
supplied with the machine and are also
available as special accessories.
Blocking the Shaft
The output shaft (2) must be blocked
with the stop pin (6) to mount or remove
cutting attachments. The stop pin is
included with the machine and is
available as a special accessory.
NInsert the stop pin (6) in the bore (7)
in the gearbox as far as stop, apply
slight pressure.
NRotate shaft, nut or cutting
attachment until the stop pin slips
into position and blocks the shaft.
Mounting the Cutting Attachment
WARNING
Use a deflector that matches the cutting
attachment – see "Mounting the
Deflector".
Fitting Mowing Head with Screw
Mounting
Keep the instruction leaflet for the
mowing head in a safe place.
2
002BA266 KN
002BA267 KN
3
4
5
6
6
7
2
002BA597 KN

FS 94 R
English
17
NScrew the mowing head
counterclockwise on to the shaft (1)
as far as stop.
NBlock the shaft.
NTighten down the mowing head
firmly.
NOTICE
Remove the tool used to block the shaft.
Removing the Mowing Head
NBlock the shaft.
NUnscrew the mowing head
clockwise.
Mounting Metal Cutting Attachment
Keep the leaflet and packaging of the
metal cutting tool in a safe place.
WARNING
Wear protective gloves to reduce the
risk of direct contact with the sharp
cutting edges.
Mount only metal cutting attachments.
Check direction of rotation of cutting
attachment
The cutting edges of the grass cutting
blades (1) and (2) may point in either
direction – these cutting attachments
must be turned over regularly to reduce
one-sided wear.
Cutting edges of grass cutting blade (3)
must point clockwise.
WARNING
Direction of rotation is indicated by an
arrow on the inside of the deflector.
NPlace the cutting attachment (4) on
the thrust plate (5).
WARNING
Collar (see arrow) must engage the
cutting attachment's mounting hole.
Securing the cutting attachment
NFit the thrust washer (6) – convex
side must face up.
NFit the rider plate (7).
NBlock the shaft (8).
NScrew the mounting nut (9) on to the
shaft counterclockwise and tighten
it down firmly.
WARNING
If the mounting nut has become too
loose, fit a new one.
1
002BA385 KN
1
3
2
681BA050 KN
681BA051 KN
6
9
7
8
5
4

FS 94 R
English
18
NOTICE
Remove the tool used to block the shaft.
Removing the Metal Cutting Attachment
WARNING
Wear protective gloves to reduce the
risk of direct contact with the sharp
cutting edges.
NBlock the shaft.
NUnscrew the mounting nut
clockwise.
NRemove cutting attachment and its
mounting hardware from the
gearbox – but do not remove the
thrust plate (5).
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.
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.
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.
Fuel