STIHL FS 94 R Instruction Manual
STIHL FS 94
WARNING
Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.
{
Instruction Manual
Manual de instrucciones
Instruction Manual
1 - 46
Manual de instrucciones
47 - 97
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 15
Mounting the Loop Handle 16
Mounting the Deflector 18
Mounting the Cutting Attachment 19
Original Instruction ManualPrinted on chlorine-free paper
Fuel 22
Fueling 23
Fitting the Harness 23
Balancing the Trimmer/Brushcutter 24
Starting / Stopping the Engine 25
Transporting the Unit 27
Operating Instructions 28
Cleaning the Air Filter 28
Engine Management 29
Adjusting the Carburetor 29
Spark Arresting Screen in Muffler 29
Spark Plug 30
Rewind Starter 31
Printing inks contain vegetable oils, paper can be recycled.
Storing the Machine 31
Sharpening Metal Cutting Blades 32
Maintaining the Mowing Head 32
Inspection and Maintenance by
User 33
Inspections and Maintenance by
Dealer 33
Maintenance and Care 35
Main Parts 37
Specifications 39
Special Accessories 40
Maintenance and Repairs 40
Disposal 41
STIHL Incorporated Federal
Emission Control Warranty
Statement 41
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 43
Trademarks 45
Allow only persons who fully understand
this manual to operate your trimmer /
brushcutter.
To receive maximum performance and
satisfaction from your STIHL trimmer /
brushcutter, it is important that you read,
understand and follow the safety
precautions and the operating and
maintenance instructions in chapter
"Safety Precautions and Working
Techniques" before using your trimmer /
brushcutter. For further information you
can go to www.stihlusa.com.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
WARNING
Because a trimmer / brushcutter is a
high-speed cutting tool some special
safety precautions must be observed to
reduce the risk of personal injury.
Careless or improper use may cause
serious or even fatal injury.
Make sure your unit is equipped with the
proper deflector, handle and harness for
the type of cutting attachment being
used. Always wear proper eye
protection.
{
© ANDREAS STIHL AG & Co. KG, 2014
0458-593-8621-A. VA3.E14.
0000006450_006_GB
STIHL FS 94 R
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
Pictograms
The meanings of the pictograms
attached to or embossed on the
machine are explained in this manual.
Depending on the model concerned, the
following pictograms may be on your
machine.
Fuel tank for gasoline
and engine oil mixture
Press to operate decompression valve
Manual fuel pump
Press to operate manual
fuel pump
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols and signal words described
below:
DANGER
Indicates an imminent risk of severe or
fatal injury.
Engineering Improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differs from those
described in this manual, please contact
your STIHL dealer or the STIHL
distributor for your area for assistance.
WARNING
Filler hole for gear
lubricant
Air intake summer mode
Indicates a hazardous situation which, if
not avoided, could result in severe or
fatal injury.
NOTICE
Air intake winter mode
Handle heating
2
Indicates a risk of property damage,
including damage to the machine or its
individual components.
STIHL FS 94 R
English
Safety Precautions and
Working Techniques
Because a trimmer /
brushcutter is a highspeed, fast-cutting power
tool sometimes equipped
with sharp cutting blades,
special safety precautions must be observed to
reduce the risk of personal injury.
It is important that you
read, fully understand
and observe the following
safety precautions and
warnings. Read the
instruction manual and
the safety precautions
periodically. Careless or
improper use may cause
serious or fatal injury.
The terminology utilized in this manual
when referring to the power tool reflects
the type of cutting attachments that may
be mounted on it. The term "trimmer" is
used to designate an FS unit that is
equipped with a nylon line head or a
head with flexible plastic blades (i.e., the
PolyCut head.) A "brushcutter"
designates a unit equipped with a rigid
metal blade. Many FS models may be
used as either a trimmer or a brushcutter
– therefore, the power tool is referred in
this manual as a "trimmer / brushcutter".
Some smaller and / or lightweight FS
models may only be used as a trimmer,
i.e., they may not be used with metal
blades.
FS models with an "R" on the nameplate
were originally configured (at the time of
distribution) as a trimmer with a loop
handle.
WARNING
As more fully explained later in these
Safety Precautions, to reduce the risk of
personal injury, make sure your unit is
equipped with the proper handle,
harness and deflector for the type of
cutting attachment you are using. Use
only cutting attachments that are
specifically authorized by STIHL for use
on your FS model.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
WARNING
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
WARNING
The use of this machine may be
hazardous. If the rotating line or blade
comes in contact with your body, it will
cut you. When it comes in contact with
solid foreign objects such as rocks or
bits of metal, it may fling them directly or
by ricochet in the direction of bystanders
or the operator. Striking such objects
could damage the cutting attachment
and may cause blades to crack, chip or
break. Thrown objects, including broken
heads or blades, may result in serious or
fatal injury to the operator or bystanders.
STIHL does not recommend the use of
rigid blades when cutting in stony areas.
Use your trimmer / brushcutter equipped
with the appropriate cutting attachment
only for cutting grass and similar
material.
WARNING
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
WARNING
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
WARNING
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
Most of these safety precautions and
warnings apply to the use of all STIHL
trimmer / brushcutters. Different models
may have different parts and controls.
See the appropriate section of your
instruction manual for a description of
the controls and the function of the parts
of your model.
Safe use of a trimmer / brushcutter
involves
1. the operator
2. the power tool
3. the use of the power tool
STIHL FS 94 R
3
English
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate
this machine when you are fatigued.
WARNING
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
this machine.
WARNING
Prolonged use of a power tool (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud's phenomenon) or
carpal tunnel syndrome.
These conditions reduce the hand's
ability to feel and regulate temperature,
produce numbness and burning
sensations and may cause nerve and
circulation damage and tissue necrosis.
All factors which contribute to
whitefinger disease are not known, but
cold weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
– Most STIHL power tools are
available with an anti-vibration
("AV") system designed to reduce
the transmission of vibrations
created by the machine to the
operator's hands. An AV system is
recommended for those persons
using power tools on a regular or
sustained basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A power tool with loose
components or with damaged or
worn AV elements will tend to have
higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure. Take
frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should closely monitor the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
WARNING
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with a pacemaker should
consult their physician and the
pacemaker manufacturer before
operating this tool.
Proper Clothing
WARNING
To reduce the risk of injury, the operator
should wear proper protective apparel.
WARNING
The deflector provided with your power
tool will not protect the operator from all
foreign objects (gravel, glass, wire, etc.)
thrown back by the rotating cutting
attachment. Thrown objects may also
ricochet and strike the operator.
4
STIHL FS 94 R
English
WARNING
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protective glasses with
adequate top and side
protection complying with
ANSI Z 87.1 (or your
applicable national standard.) To reduce the risk of
injury to your face STIHL
recommends that you
also wear a face shield or
face screen over your
goggles or protective
glasses.
Wear an approved safety
hard hat to reduce the
risk of injury to your head
when there is a danger of
head injuries.
Power tool noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their
hearing checked
regularly.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Always wear heavy duty
work gloves (e.g. made of
leather or other wear
resistant material) when
handling the machine
and metal blades. Heavyduty, nonslip gloves
improve your grip and
help to protect your
hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Wear long
pants made of heavy
material to help protect
your legs. Do not wear
shorts, sandals or go
barefoot.
Avoid loose-fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants,
unconfined long hair or anything that
could become caught on branches,
brush or the moving parts of the unit.
Secure hair so it is above shoulder level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts."
WARNING
Never modify this power tool in any way.
Only attachments supplied by STIHL
and expressly approved by STIHL for
use with the specific STIHL model are
authorized. Although certain
unauthorized attachments are useable
with STIHL power tools, their use may,
in fact, be extremely dangerous. For the
cutting attachments authorized by
STIHL for your unit, see the chapter
"Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness" in the instruction manual or the
STIHL "Cutting Attachments, Parts &
Accessories" catalog.
If this tool is subjected to unusually high
loads for which it was not designed (e.g.
heavy impact or a fall), always check
that it is in good condition before
continuing work. Check in particular that
the fuel system is tight (no leaks) and
that the controls and safety devices are
working properly. Do not continue
operating this machine if it is damaged.
In case of doubt, have it checked by your
STIHL servicing dealer.
THE USE OF THE POWER TOOL
Transporting the Power Tool
WARNING
To reduce the risk of injury from loss of
control and blade or line contact, never
carry or transport your power tool with
the cutting attachment moving.
STIHL FS 94 R
5
English
389BA019 KN
It may be carried only in a horizontal
position. Grip the shaft in a manner that
the machine is balanced horizontally.
Keep the hot muffler away from your
body and the cutting attachment behind
you.
WARNING
To reduce the risk of burn
injury, do not touch hot
parts of the machine and
the gear housing when
they are hot.
WARNING
Always shut off the engine and make
sure the cutting attachment has stopped
before putting a trimmer / brushcutter
down. When transporting it in a vehicle,
properly secure it to prevent turnover,
fuel spillage and damage to the unit.
STIHL recommends that you keep metal
blades covered with the transport guard
(optional accessory.)
Fuel
Your STIHL power tool uses an oil-
gasoline mixture for fuel (see the
chapter on "Fuel" of your instruction
manual.)
WARNING
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and serious burn injury or
property damage. Use
extreme caution when
handling gasoline or fuel
mix. Do not smoke or
bring any fire or flame
near the fuel or the power
tool. Note that combustible fuel vapor may
escape from the fuel
system.
Fueling Instructions
WARNING
To reduce the risk of serious injury from
burns, never attempt to refuel the unit
until it has been completely removed
from the operator.
WARNING
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before
refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Wipe off
any spilled fuel before starting your
machine.
WARNING
Check for fuel leakage
while refueling and during
operation. If fuel leakage
is found, do not start or
run the engine until the
leak is fixed and any
spilled fuel has been
wiped away. Take care
not to get fuel on your
clothing. If this happens,
change your clothing
immediately.
WARNING
In order to reduce the risk of fuel spillage
and fire from an improperly tightened
fuel cap, correctly position and tighten
the fuel cap in the fuel tank opening.
6
STIHL FS 94 R
English
WARNING
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. In order to
reduce the risk of fuel
spillage and fire, tighten
the fuel filler cap by hand
as securely as possible.
See also the "Fueling" chapter in your
Instruction Manual for additional
information.
Before Starting
WARNING
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, throttle set wheel,
momentary stop switch, cutting
attachment, deflector and harness. The
throttle trigger must move freely and
always spring back to the idle position.
Never attempt to modify the controls or
safety devices.
WARNING
Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
power tools equipped with a manual fuel
pump). Do not start the engine if there
are leaks or damage – risk of fire! Have
the machine repaired by a servicing
dealer before using it.
WARNING
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely or
securely assembled.
WARNING
Do not attach any cutting attachment to
a unit without proper installation of all
required parts. Failure to use the proper
parts may cause the blade or head to fly
off and seriously injure the operator or
bystanders.
WARNING
The cutting attachment must be properly
tightened and in safe operating
condition. Inspect for loose parts (nuts,
screws, etc.) and for cracked or
damaged heads or cracked, bent,
warped or damaged blades. Replace
damaged heads or blades before using
the power tool. Always keep blades
sharp.
Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, fuel mix,
grease or resin in order for you to
maintain a firm grip and properly control
your power tool.
WARNING
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
WARNING
To reduce the risk
of personal injury
to the operator
from blade or line
contact and
thrown objects,
make sure your
unit is equipped
with the proper
deflector, handle
and harness for
the type of cutting
attachment being
used (see chart in
the chapter on
"Approved Combinations of Cutting
Attachment,
Deflector, Handle
and Harness".)
As can be seen in that chart, some
cutting attachments may require you to
change your deflector, handle and / or
harness.
Keep the deflector (and the attached
skirt where appropriate) adjusted
properly at all times (see chapters on
"Mounting the Deflector" and "Mounting
the Cutting Attachment" of your
instruction manual.)
STIHL FS 94 R
7
English
A
000BA006 KN
Arrows on the deflector (A) (as seen
from the underside) show the correct
direction of rotation of the cutting
attachment. When viewed from above,
however, the cutting attachment rotates
counterclockwise.
Some of the following symbols may be
embossed on the outside of the deflector
in order to indicate the approved
combination of cutting attachment and
deflector.
The deflector may be
used in combination with
mowing heads.
The deflector may be
used in combination with
grass cutting blades.
The deflector may be
used in combination with
brush knives.
The deflector must not be
used in combination with
mowing heads.
The deflector must not be
used in combination with
grass cutting blades.
The deflector must not be
used in combination with
brush knives.
The deflector must not be
used in combination with
circular saw blades.
The deflector must not be
used in combination with
brush knives or circular
saw blades.
The deflector must not be
used in combination with
grass cutting blades,
brush knives or circular
saw blades.
Adjust carrying harness and hand grip to
suit your size before starting work. The
machine should be properly balanced as
specified in your instruction manual for
proper control and less fatigue in
operation. To be better prepared in case
of an emergency, practice releasing the
unit from the harness as quickly as
possible.
Starting
WARNING
Start the engine at least 10 feet (3 m)
from the fueling spot, outdoors only.
For specific starting instructions, see the
appropriate section of your manual.
Place the power tool on firm ground or
other solid surface in an open area.
Maintain good balance and secure
footing.
WARNING
To reduce the risk of injury from blade or
line contact, be absolutely sure that the
cutting attachment is clear of you and all
other obstructions and objects, including
the ground, because when the engine
starts at starting-throttle or with the
choke knob engaged, engine speed will
be fast enough for the clutch to engage
and move the cutting attachment.
Once the engine has started,
immediately blip the throttle trigger or
choke knob, which should release the
starting throttle and allow the engine to
slow down to idle.
With the engine running only at idle,
attach the power tool to the spring hook
of your harness if you are using one (see
appropriate chapter of the instruction
manual regarding "Fitting the Harness".)
WARNING
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
8
STIHL FS 94 R
English
002BA273 KN
WARNING
To reduce the risk of injury from loss of
control, do not attempt to "drop start"
your power tool.
WARNING
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
result in injury to your hand or fingers
and may damage the starter
mechanism.
Important Adjustments
WARNING
To reduce the risk of personal injury
from loss of control or contact with the
running cutting attachment, do not use
your unit with incorrect idle adjustment.
At correct idle speed, the cutting
attachment should not move. For
directions on how to adjust idle speed,
see the appropriate section of your
instruction manual.
If you cannot set the correct idle speed,
have your STIHL dealer check your
power tool and make proper
adjustments and repairs.
WARNING
This unit is equipped with an ignition
system that is normally in operational
readiness. After the momentary stop
switch is used to stop the engine, it
automatically springs back to the "on"
position. If the engine is warm, it may be
possible to start it by simply pulling the
starter rope, with no further adjustments.
To reduce the risk of injury, be
particularly alert to keep children away
from the unit.
During Operation
Holding and Controlling the Power Tool
Always hold the unit firmly with both
hands on the handles while you are
working. Wrap your fingers and thumbs
around the handles.
WARNING
To reduce the risk of injury from loss of
control, never work on a ladder or on any
other insecure support. Never hold the
cutting attachment above waist height.
WARNING
Never attempt to operate
your power tool with one
hand. Loss of control of
the power tool resulting in
serious or fatal injury may
result. To reduce the risk
of cut injuries, keep
hands and feet away
from the cutting attachment. Never touch a
moving cutting attachment with your hand or
any other part of your
body.
WARNING
Do not overreach. Keep proper footing
and balance at all times. Special care
must be taken in slippery conditions (wet
ground, snow) and in difficult, overgrown
terrain. Watch for hidden obstacles such
as tree stumps, roots and ditches to
avoid stumbling. For better footing, clear
away scrub and cuttings. Be extremely
cautious when working on slopes or
uneven ground.
Working Conditions
Operate and start your power tool only
outdoors in a well ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
STIHL FS 94 R
9
English
15m (50ft)
WARNING
As soon as the engine is
running, this product generates toxic exhaust
fumes containing chemicals, such as unburned
hydrocarbons (including
benzene) and carbon
monoxide, that are
known to cause respiratory problems, cancer,
birth defects, or other
reproductive harm. Some
of the gases (e.g. carbon
monoxide) may be colorless and odorless. To
reduce the risk of serious
or fatal injury / illness
from inhaling toxic fumes,
never run the machine
indoors or in poorly ventilated locations.
WARNING
If the vegetation being cut or the
surrounding ground is coated with a
chemical substance (such as an active
pesticide or herbicide), read and follow
the instructions and warnings that
accompanied the substance at issue.
WARNING
Inhalation of certain dusts, especially
organic dusts such as mold or pollen,
can cause susceptible persons to have
an allergic or asthmatic reaction.
Substantial or repeated inhalation of
dust and other airborne contaminants, in
particular those with a smaller particle
size, may cause respiratory or other
illnesses. Control dust at the source
10
where possible. Use good work
practices, such as operating the unit so
that the wind or operating process
directs any dust raised by the power tool
away from the operator. Follow the
recommendations of EPA / OSHA /
NIOSH and occupational and trade
associations with respect to dust
("particulate matter".) When the
inhalation of dust cannot be
substantially controlled, i.e., kept at or
near the ambient (background) level, the
operator and any bystanders should
wear a respirator approved by NIOSH /
MSHA for the type of dust encountered.
Operating Instructions
WARNING
Do not operate your power tool using the
starting throttle lock or with the choke
knob engaged, as you do not have
control of the engine speed.
In the event of an emergency, switch off
the engine immediately – move the
momentary stop switch to 0 or STOP.
WARNING
The cutting attachment
continues to rotate for a
short period after the
throttle trigger is released
(flywheel effect.)
WARNING
The rotating cutting attachment may
fling foreign objects directly or by
ricochet a great distance.
To reduce the risk of eye and other injury
always wear proper eye protection (see
the chapter on "Proper Clothing") and
ensure that bystanders are at least
15 meters (50 feet) away. To reduce the
risk of damage to property, also maintain
this distance from such objects as
vehicles or windows. Even maintaining a
minimum distance of 15 meters (50 feet)
cannot exclude the potential danger.
Any coworkers who must be in the
restricted area should also wear goggles
or protective glasses. Stop the engine
immediately if you are approached.
WARNING
Inspect the work area: To
reduce the risk of injury,
remove stones, pieces of
metal and other solid
objects which could be
thrown 15 meters
(50 feet) or more by the
cutting attachment or
damage the cutting
attachment and property
(e.g. parked vehicles,
windows).
WARNING
This trimmer / brushcutter is normally to
be used at ground level with the cutting
attachment parallel to the ground. Use of
a trimmer / brushcutter above ground
level or with the cutting attachment
STIHL FS 94 R
English
perpendicular to the ground may
increase the risk of injury, since the
cutting attachment is more fully exposed
and the power tool may be more difficult
to control.
WARNING
During cutting, check the tightness and
the condition of the cutting attachment at
regular short intervals with the engine
and attachment stopped. If the behavior
of the attachment changes during use,
stop the engine immediately, wait until
the cutting attachment stops, and check
the nut securing the attachment for
tightness and the blade or head for
cracks, wear and damage.
WARNING
A loose blade or head may vibrate,
crack, break or come off the trimmer /
brushcutter, which may result in serious
or fatal injury. Make sure that the cutting
attachment is properly tightened. Use
the wrench supplied or one of sufficient
length to obtain the proper torque. If the
blade or head loosens after being
properly tightened, stop work
immediately. The retaining nut may be
worn or damaged and should be
replaced. If the blade or head continues
to loosen, see your STIHL dealer. Never
use a trimmer / brushcutter with a loose
cutting attachment.
WARNING
Replace a cracked, damaged or wornout head or a cracked, bent, warped,
damaged, dull or worn out blade
immediately, even if damage is limited to
superficial cracks. Such attachments
may shatter at high speed and cause
serious or fatal injury.
WARNING
When using rigid blades, avoid cutting
close to fences, sides of buildings, tree
trunks, stones or other such objects that
could cause the power tool to kick out or
could cause damage to the blade.
STIHL recommends use of the nylon line
heads for such jobs. In addition, be alert
to an increased possibility of ricochets in
such situations.
WARNING
If a rotating metal blade strikes a rock or
other hard object, sparks may be
created, which can ignite flammable
materials under certain circumstances.
Flammable materials can include dry
vegetation and brush, particularly when
weather conditions are hot and dry.
When there is a risk of fire or wildfire, do
not use metal blades around flammable
materials or around dry vegetation or
brush. Contact your local fire authorities
or the U.S. Forestry Service if you have
any question about whether vegetation
and weather conditions are suitable for
the use of a metal blade.
WARNING
If the head, blade or deflector becomes
clogged or stuck, always shut off the
engine and make sure the cutting
attachment has stopped before
cleaning. Grass, weeds, etc. should be
cleaned off the blade or from around the
head at regular intervals.
WARNING
To reduce the risk of unintentional
rotation of the cutting attachment and
injury, always shut off the engine and
remove the spark plug boot before
replacing the cutting attachment. To
reduce the risk of injury, always shut off
the engine before adjusting the length of
the nylon line on manually adjustable
mowing heads.
WARNING
The gearbox becomes
hot during operation. To
reduce the risk of burn
injury, do not touch the
gear housing when it is
hot.
WARNING
Never modify your muffler. Any
modification could cause an increase in
heat radiation, sparks or sound level,
thereby increasing the risk of fire, burn
injury or hearing loss. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL servicing dealer only.
WARNING
The muffler and other parts of the engine
(e.g. fins of the cylinder, spark plug)
become hot during operation and remain
hot for a while after stopping the engine.
To reduce risk of burns, do not touch the
muffler and other parts while they are
hot. Keep the area around the muffler
clean. Remove excess lubricant and all
debris such as pine needles, branches
or leaves. Let the engine cool down in
STIHL FS 94 R
11
English
002BA354 KN
the upright position sitting on concrete,
metal, bare ground or solid wood (away
from any combustible substances, such
as dry brush, grass or wood chips.
WARNING
An improperly mounted or damaged
cylinder housing or a
damaged/deformed muffler shell may
interfere with the cooling process of the
muffler. To reduce the risk of fire or burn
injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a
damaged/deformed muffler shell.
Your muffler is furnished with a spark
arresting screen designed to reduce the
risk of fire from the emission of hot
particles. Never operate your unit with a
missing or damaged spark arresting
screen. If your gas/oil mix ratio is correct
(i.e., not too rich), this screen will
normally stay clean as a result of the
heat from the muffler and need no
service or maintenance. If you
experience loss of performance and you
suspect a clogged screen, have your
muffler maintained by a STIHL servicing
dealer. Some state or federal laws or
regulations may require a properly
maintained spark arrestor for certain
uses. See the "Maintenance, Repair and
Storing" section of these Safety
Precautions. Remember that the risk of
a brush or forest fire is greater in hot or
dry conditions.
Using the Cutting Attachments
For an illustration of the various cutting
attachments and instructions on proper
mounting see the chapter on "Mounting
the Cutting Attachment" in your
instruction manual.
WARNING
To reduce the risk of severe or fatal
injury from blade contact and / or loss of
control, never attempt to use a metal
blade on an FS model for which it is not
authorized.
Using the Mowing Heads
Do not use with mowing line longer than
the intended length. With a properly
mounted deflector, the built-in linelimiting blade will automatically adjust
the line to its proper length.
Using the unit with an overly long nylon
cutting line increases the load on the
engine and reduces its operating speed.
This causes the clutch to slip
continuously and results in overheating
and damage to important components
(e.g. clutch, polymer housing
components.) Such damage could,
among other things, cause the cutting
attachment to rotate at idle.
Mowing heads are to be used only on
trimmer / brushcutters equipped with a
line-limiting blade in the deflector in
order to keep the line at the proper
length (see "Main Parts" chapter in your
instruction manual.)
If the lawn edges are planted with trees
or bordered by a fence etc., it is best to
use a nylon line head. It achieves a
"softer" cut with less risk of damaging
tree bark etc. than polymer blades.
However, the polymer-bladed STIHL
PolyCut produces a better cut if there
are no plants along the edge of the lawn.
Sharpening is not necessary, and worn
polymer blades are easily replaced.
WARNING
To reduce the risk of serious injury,
never use wire or metal-reinforced line
or other material in place of the nylon
cutting lines. Pieces of wire could break
off and be thrown at high speed toward
the operator or bystanders.
STIHL SuperCut mowing head
Fresh line is advanced automatically.
Frayed line is replaced by a simple
adjustment (see instruction sheet
supplied with mowing head).
12
STIHL FS 94 R
English
002BA177 KN
002BA135 KN
002BA355 KN
STIHL AutoCut mowing head
Nylon cutting line advances
automatically when tapped against the
ground (TapAction).
STIHL PolyCut mowing head 20-3
Uses either nylon lines or nonrigid,
pivoting polymer blades.
Observe wear indicators.
WARNING
Three rectangular wear limit marks are
applied to the base (periphery) of the
PolyCut. To reduce the risk of serious
injury from breakage of the head or
blades, the PolyCut must not be used
when it has worn as far as one of these
marks. It is important to follow the
maintenance instructions supplied with
the head.
WARNING
If the wear limit marks are ignored, there
is a risk of the cutting attachment
shattering and flying parts injuring the
operator or bystanders. To reduce the
risk of accidents from shattered blades,
avoid contact with stones, metal and
similar solid objects. Check PolyCut
blades for cracks at regular intervals. If a
crack is found on one blade, always
replace all blades.
STIHL FixCut mowing head
Uses pre-cut lengths of nylon line.
Observe wear indicators.
Do not continue using the mowing head
if the raised moldings (1) on the base
are missing or worn – see right
illustration above. The mowing head
may otherwise shatter and flying objects
could result in injury to the operator or
bystanders. Install a new mowing head.
Risk of Kickout (Blade Thrust) with All
Rigid Cutting Blades
WARNING
Kickout (blade thrust) is the sudden and
uncontrolled motion towards the
operator's right or rear that can occur
when the shaded area (especially the
darkly shaded area) of a rotating blade
comes in contact with a solid rigid object
like a tree, rock, bush or wall. The rapid
counterclockwise rotation of the blade
may be stopped or slowed, and the
cutting attachment may be thrown to the
right or to the rear.
This kickout (blade thrust) may cause
loss of control of the power tool and may
result in serious or fatal injury to the
operator or bystanders. To reduce the
risk of injury, extreme caution should be
used when cutting with the shaded area
of any rigid blade.
Using the Grass Cutting Blade
All kinds of grass and weeds can be
easily cut with the grass cutting blade.
The power tool is swept in an arc similar
to a scythe.
WARNING
To reduce the risk of serious or fatal
injury from blade breakage, never
attempt to use this blade to cut woody
materials.
The 4-tooth grass cutting blade is
intended to cut grass and weeds. It has
4 cutting knives with cutting edges on
both sides, i.e. front and rear. When the
cutting edges on one side become dull,
the blade can be turned over to utilize
the cutting edges on the other side.
The 8-tooth grass cutting blade is
recommended for cutting fern or reed.
STIHL FS 94 R
13
English
Both types of grass cutting blade have to
be resharpened when all cutting edges
are dull.
MAINTENANCE, REPAIR AND
STORING
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
WARNING
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non-STIHL parts may cause serious or
fatal injury.
Strictly follow the maintenance and
repair instructions in the appropriate
sections of your instruction manual.
WARNING
Always stop the engine and make sure
that the cutting attachment is stopped
before doing any maintenance or repair
work or cleaning the power tool. Do not
attempt any maintenance or repair work
not described in your instruction manual.
Have such work performed by your
STIHL servicing dealer only.
Wear gloves when handling or
performing maintenance on blades.
WARNING
Use the specified spark plug, and make
sure it and the ignition lead are always
clean and in good condition. Always
press the spark plug boot snugly onto
the spark plug terminal of the proper
size. (Note: If the terminal has a
detachable SAE adapter nut, it must be
securely attached.) A loose connection
between the spark plug and the ignition
wire connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
WARNING
Never test the ignition system with the
spark plug boot removed from the spark
plug or with a removed spark plug, since
uncontained sparking may cause a fire.
WARNING
Do not operate your power tool if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
Your muffler is equipped with a sparkarresting screen to reduce the risk of
fire; never operate your power tool if the
screen is missing, damaged or clogged.
Remember that the risk of a brush or
forest fire is greater in hot or dry
weather.
In California, it is a violation of § 4442 or
§ 4443 of the Public Resources Code to
use or operate gasoline-powered tools
on forest-covered, brush-covered or
grass-covered land unless the engine’s
exhaust system is equipped with a
complying spark arrester that is
maintained in effective working order.
The owner/operator of this product is
responsible for properly maintaining the
spark arrester. Other states or
governmental entities/agencies, such as
the U.S. Forest Service, may have
similar requirements. Contact your local
fire agency or forest service for the laws
or regulations relating to fire protection
requirements.
WARNING
Never repair damaged cutting
attachments by welding, straightening or
modifying the shape. This may cause
parts of the cutting attachment to come
off and result in serious or fatal injuries.
Keep blades sharp. Tighten all nuts,
bolts and screws, except the carburetor
adjustment screws, after each use.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Store the power tool in a dry and high or
locked location out of reach of children.
Before storing for longer than a few
days, always empty the fuel tank. See
chapter "Storing the Machine" in the
instruction manual.
14
STIHL FS 94 R
Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
1
2
3
4
7
8
14
16
18
14
18
17
681BA256 KN
5
6
13
15
15
11
9
10
12
Cutting Attachment Deflector Handle Harness
English
Approved Combinations
The complete combination includes:
– Cutting attachment
– Deflector
– Handle
– Harness
STIHL FS 94 R
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 because of
the risk of accidents.
Cutting Attachments
Mowing heads
1 STIHL SuperCut 20-2
2 STIHL AutoCut 25-2
15
English
002BA571 KN
3 STIHL FixCut 25-2
4 STIHL FixCut 30-2
5 STIHL DuroCut 20-2
6 STIHL PolyCut 20-3
Metal cutting attachments
7 Grass cutting blade 230-4
8 Grass cutting blade 230-8
WARNING
Non-metal grass cutting blades are not
approved.
Deflectors
9 Deflector with blade for mowing
heads
10 Deflector with
11 Skirt and blade for mowing heads
12 Deflector without Skirt and blade for
metal cutting attachments
Handle
Choose the proper deflector in order to
reduce the risk of injury from thrown
objects and contact with the cutting
attachment.
Make sure your unit is equipped with the
proper handle and harness in order to
reduce the risk of injury from loss of
control and contact with the cutting
attachment: use grass cutting metal
blades on this unit only if equipped with
a bike handle or a loop handle with
barrier bar.
Do not use rigid plastic blades, brush
knifes or circular saw blades on this unit.
Mounting the Loop Handle
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.
13 Loop handle
14 Loop handle with
15 Barrier bar
Harnesses
16 Shoulder strap may be used
17 Shoulder strap must be used
18 Full harness may be used
WARNING
Based on the cutting attachment being
used:
16
STIHL FS 94 R
English
2
002BA098 KN
1
1
5
4
002BA099 KN
2
3
6
7
4
5
002BA136 KN
1
6
1
3
8
7
8
7
Mounting Loop Handle with Barrier Bar
N Fit the square nuts (1) in the barrier
bar (2); the holes must line up.
N Place the clamp (3) in the loop
handle (4) and position them both
against the drive tube (5).
N Place the clamp (6) against the
drive tube.
N Place the barrier bar (2) in position
as shown.
N Line up the holes.
N Insert the screws (7) in the holes
and screw them into the barrier
bar (2) as far as stop.
N Go to "Securing the Loop Handle".
Mounting the Loop Handle without
Barrier Bar
N Place the clamp (3) in the loop
handle (4) and position them both
against the drive tube (5).
N Place the clamp (6) against the
drive tube.
N Line up the holes.
N Fit washers (7) on the screws (8)
and insert the screws in the holes.
Fit the square nuts (1) and screw
them down as far as stop.
N Go to "Securing the Loop Handle".
STIHL FS 94 R
17
English
4
002BA570 KN
A
A
002BA572 KN
B
002BA573 KN
C
002BA574 KN
002BA380 KN
2
1
3
3
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)
N Slide the handle to the required
position.
N Line up the loop handle (4).
N Tighten down the screws so that the
handle cannot be rotated on the
drive tube.
Mounting the Deflector
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.
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.
18
N Position deflector (1) or (2) on the
gearbox.
N Insert the screws (3) and tighten
them down firmly.
STIHL FS 94 R
English
4
1
5
4
002BA103 KN
1191BA026 KN
1
002BA383 KN
2
002BA266 KN
Fitting the Skirt and Blade
WARNING
These parts must be fitted to the
deflector (1) when you use a mowing
head.
N Slide the lower guide slot of the skirt
(4) onto the deflector (1) – it must
snap into position.
N Push the blade (5) into the upper
guide slot on the skirt and line it up
with the first hole.
N Insert the screw and tighten it down
firmly.
Mounting the Cutting
Attachment
Placing power tool on the ground
N Shut off the engine.
N Lay 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.
N Slip the thrust plate (1) over the
shaft (2).
Mounting Hardware for Cutting
Attachments
The mounting hardware supplied
depends on the cutting attachment that
comes as original equipment with the
new machine.
If mounting hardware is not packed with
machine
Only mowing heads may be used which
mount directly to the shaft (2).
If mounting hardware is packed with
machine
Mowing heads and metal cutting
attachments may be mounted.
STIHL FS 94 R
NOTICE
The thrust plate on the gearbox is
necessary for mounting cutting tools.
19
English
002BA267 KN
3
4
5
6
6
7
2
002BA597 KN
1
002BA385 KN
N Insert the stop pin (6) in the bore (7)
in the gearbox as far as stop, apply
slight pressure.
N Rotate shaft, nut or cutting
attachment until the stop pin slips
into position and blocks the shaft.
Mount the cutting attachment.
WARNING
Use a deflector that matches the cutting
attachment – see "Mounting the
Deflector".
Fitting Mowing Head with Screw
Mounting
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.
Block 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.
20
Keep the instruction leaflet for the
mowing head in a safe place.
N Screw the mowing head
counterclockwise on to the shaft (1)
as far as stop.
N Block the shaft.
N Tighten down the mowing head
firmly.
NOTICE
Remove the tool used to block the shaft.
Removing the Mowing Head
N Block the shaft.
N Unscrew the mowing head
clockwise.
STIHL FS 94 R
English
1
2
681BA108 KN
681BA051 KN
6
9
7
8
5
4
Mounting Metal Cutting Attachment
WARNING
Wear protective gloves to reduce the
risk of direct contact with the sharp
cutting edges.
Check direction of rotation of cutting
attachment
The cutting edges of the grass cutting
blade (1) may point in either direction –
this cutting attachment must be turned
over regularly to reduce one-sided wear.
Cutting edges of grass cutting blade (2)
must point clockwise.
WARNING
Direction of rotation is indicated by an
arrow on the inside of the deflector.
N Place 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
N Fit the thrust washer (6) – convex
side must face up.
N Fit the rider plate (7).
N Block the shaft (8).
N Screw the mounting nut (9) on to the
shaft counterclockwise and tighten
it down firmly.
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.
N Block the shaft.
N Unscrew the mounting nut
clockwise.
N Remove cutting attachment and its
mounting hardware from the
gearbox – but do not remove the
thrust plate (5).
STIHL FS 94 R
WARNING
If the mounting nut has become too
loose, fit a new one.
21
English
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
Fuel with a lower octane rating may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or even
damage the engine. For this reason
STIHL recommends that you use only
high-quality unleaded gasoline!
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
The ethanol content in gasoline affects
engine running speed – it may be
necessary to readjust the carburetor if
you use fuels with various ethanol
contents.
WARNING
To reduce the risk of personal injury
from loss of control and/or contact with
the running cutting tool, do not use your
unit with incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your power tool shows an incorrect idle
adjustment, have your STIHL dealer
check your power tool and make proper
adjustments and repairs.
The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to
another fuel with a much higher or lower
ethanol content.
This problem can be avoided by always
using fuel with the same ethanol
content.
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke
engine oils that are designed for use
only in air cooled two-cycle engines.
We recommend STIHL HP Ultra 2-Cycle
Engine Oil since it is specially
formulated for use in STIHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
WARNING
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.
The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.
The machine‘s fuel tank should be
cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 30 days of storage.
Store in approved fuel-containers only.
When mixing, pour oil into the container
first, and then add gasoline. Close the
container and shake it vigorously by
hand to ensure proper mixing of the oil
with the fuel.
Gasoline
US gal. US fl.oz.
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Oil (STIHL 50:1 or equivalent high-quality oils)
22
STIHL FS 94 R
English
0208BA019 KN
0208BA020 KN
0208BA021 KN
1
1191BA012 KN
2
Fueling
Preparations
WARNING
When fueling on a slope, always position
the machine so that the filler cap is
facing uphill.
N On level ground, position the
machine so that the filler cap is
facing up.
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
WARNING
In order to reduce the risk of fire and
personal injury from escaping gas vapor
and fumes, remove the fuel filler cap
carefully so as to allow any pressure
build-up in the tank to release slowly.
Opening the screw cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the filler cap.
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank.
Closing the screw cap
N Position cap.
N Turn the cap clockwise as far as it
will go and tighten it as securely as
possible by hand.
Fitting the Harness
The type and style of the harness
depend on the market.
The use of the shoulder strap is
described in the chapter on "Approved
Combinations of Cutting Attachment,
Deflector, Handle and Harness".
Shoulder strap
N Put on the shoulder strap (1).
N Adjust the length of the strap so that
the carabiner (2) is about a hand’s
width below your right hip.
N Balance the machine.
STIHL FS 94 R
23
English
1191BA020 KN
1
3
2
1
2
1
2
002BA387 KN
1191BA021 KN
3
2
002BA390 KN
1
2
1
2
002BA391 KN
Full Harness
N Put on the full harness (1).
N Adjust the length of the strap so that
the carabiner (2) is about a hand’s
width below your right hip.
N Balance the machine.
Balancing the
Trimmer/Brushcutter
The type and style of the harness and
carabiner (spring hook) depend on the
market.
Attaching machine to shoulder strap
N Attach the carabiner (1) to the
carrying ring (2) on the drive tube.
Floating position
Balance the unit
N Loosen the screw (3).
N Move the carrying ring (2) up or
down the drive tube – tighten the
screw moderately – let the unit go
and wait until is its balanced – then
check the floating position.
When the correct floating position has
been reached:
N Tighten down the screw on the
carrying ring firmly.
Detaching machine from shoulder strap
N Mowing heads and grass cutting
blades should just touch the ground.
The correct floating position is obtained
as follows:
N Press down the bar on the
carabiner (1) and pull the carrying
ring (2) out of the carabiner.
24
STIHL FS 94 R
English
0208BA066 KN
2
1
4
3
0208BA067 KN
4
Throwing off the machine
WARNING
The machine must be quickly thrown off
in the event of imminent danger. To
throw off the machine, use the
procedure described under "Detaching
Machine from Shoulder Strap". Practice
removing and putting down the power
tool as you would in an emergency. To
avoid damage, do not throw the power
tool to the ground when practicing.
STIHL FS 94 R
Starting / Stopping the
Engine
Controls
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop
positions. Press 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".
Function of stop switch and ignition
system
The ignition is switched off and the
engine stopped when the stop switch is
pressed. The stop switch returns
automatically to the Run position when it
is released: The ignition is switched on
again after the engine stops – the engine
is then ready to start.
Function of throttle set wheel
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 unaffected. The
original setting is restored when the
throttle trigger is released.
25
English
5
0208BA029 KN
2.
1.
0208BA030 KN
6
1191BA014 KN
1191BA015 KN
Starting the Engine
N Press the manual fuel pump
bulb (5) at least five times – even if
the bulb is filled with fuel.
Cold engine (cold start)
N Turn choke knob (6) and then push
it in at g
Also use this setting if the engine has
been running but is still cold.
– Turn throttle set wheel in direction of
+ as far as stop.
Hot engine (hot start)
N Choke knob (6) remains in F
position.
Cranking
N Place the unit on the ground: It must
rest securely on the engine support
and the deflector.
N If fitted: Remove the transport guard
from the cutting attachment.
To reduce the risk of accidents, check
that the cutting attachment is not
touching the ground of any other
obstacles.
N Make sure you have a firm footing,
either standing, stooping or
kneeling.
N Hold the unit firmly on the ground
with your left hand and press down
– do not touch the throttle trigger,
lockout lever or stop switch.
NOTICE
Do not stand or kneel on the drive tube.
N Hold the starter grip with your right
hand.
N Pull the starter grip slowly until you
feel it engage and then give it a brisk
strong pull.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until engine runs.
As soon as the engine runs
At temperatures below +10 °C (+50 °F)
Warm up the engine for at least
10 seconds in position g.
At temperatures above +10 °C (+50 °F)
Warm up the engine for at least
5 seconds in position g.
26
STIHL FS 94 R
English
1191BA025 KN
681BA268 KN
681BA269 KN
681BA272 KN
N 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 cutting attachment must
not rotate when the engine is idling.
Your machine is now ready for
operation.
Stopping the Engine
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Running engine stalls in cold start
position g or under acceleration.
N Continue cranking in position F until
the engine runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Fuel tank run until completely dry
N After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is filled with fuel.
N Set the choke knob according to
engine temperature.
N Now start the engine.
Transporting the Unit
Using transport guard
Transport guards are available as
special accessories.
The transport guard can be used for
grass cutting blades up to a diameter of
230 mm.
Fitting the transport guard
Other Hints on Starting
Engine stalls in cold start position g.
N Depress throttle trigger lockout and
pull the throttle trigger – the choke
knob moves to the Run F position.
N Continue cranking in position F until
the engine runs.
STIHL FS 94 R
27
English
0208BA034 KN
1
0208BA035 KN
5
4
Operating Instructions Cleaning the Air Filter
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
If there is a noticeable loss of engine
power
N Set knob for warm start (1) to g
N Turn screw (2) in filter cover (3)
counterclockwise until the cover is
loose
N Remove filter cover (3)
N Clean away loose dirt from around
the filter
NOTICE
Replace any damaged parts!
N Insert felt filter (5) form-fittingly into
the filter housing
N Set knob for warm start (1) to g
N Fit filter cover (3) – make sure not to
tilt the screw (2) – insert screw and
tighten
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-ofservice periods – see "Storing the
Machine".
28
N Grip into the recess (4) in the filter
housing and remove the felt filter (5)
N Replace felt filter (5) – as a
temporary measure you can knock it
out on the palm of you hand or blow
it out with compressed air – do not
wash
STIHL FS 94 R
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