STIHL FS 131, 131 R
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 45
F Notice d’emploi
46 - 96
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 12
Approved Power Tool Attachments 14
Mounting the Bike Handle 14
Mounting the Loop Handle 16
Original Instruction ManualPrinted on chlorine-free paper
Adjusting the Throttle Cable 17
Fitting the Carrying Ring 18
Mounting the deflector 18
Mounting the Cutting Attachment 19
Fuel 22
Fueling 23
Fitting the Harness 24
Balancing the Machine 25
Starting / Stopping the Engine 26
Transporting the Unit 28
Operating Instructions 31
Replacing the Air Filter 31
Engine Management 31
Printing inks contain vegetable oils, paper can be recycled.
Adjusting the Carburetor 32
Spark Arresting Screen in Muffler 32
Spark Plug 33
Engine Running Behavior 34
Lubricating the Gearbox 34
Storing the Machine 34
Sharpening Metal Cutting Blades 35
Maintaining the Mowing Head 35
Maintenance and Care 37
Main Parts 39
Specifications 42
Maintenance and Repairs 43
Disposal 43
STIHL Limited Emission Control
Warranty Statement 44
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It has been built using modern
production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and trouble-free use of
the product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
© ANDREAS STIHL AG & Co. KG, 2022
0458-432-8221-A. VA5.E22.
0000007500_010_GB
FS 131, FS 131 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 the machine are explained in
this manual.
Depending on the model concerned, the
following pictograms may be attached to
your machine.
Fuel tank; fuel mixture of
gasoline and engine oil
Operate decompression
valve
Manual fuel pump
Operate manual fuel
pump
Tube of grease
Intake air: Summer
operation
Intake air: Winter
operation
Handle heating
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.
Safety Precautions and
Working Techniques
Because the machine is a
high-speed fast-cutting
power tool, special safety
precautions must be
observed to reduce the
risk of personal injury.
It is important that you
read and understand the
User Manual before commissioning and keep it in
a safe place for future reference. Non-compliance
with the User Manual
may cause serious or
even fatal injury.
Observe all applicable local safety
regulations, e.g. by trade organizations,
social insurance institutions, labor safety
authorities etc.
If you have never used a power tool
before: Have your dealer or other
experienced user show you how to
operate your machine – or attend a
special course to learn how to operate it.
Minors should never be allowed to use
the machine – except for apprentices
over the age of 16 when working under
supervision.
Children, animals and bystanders must
remain at a distance.
When not using the machine, it must be
laid down in such a way that it does not
endanger anyone. Ensure that the
machine cannot be used without
authorization.
2
FS 131, FS 131 R
English
The user is responsible for accidents or
risks involving third parties or their
property.
Do not lend or rent your power tool
without the User Manual. Be sure that
anyone using it understands the
information contained in this manual.
The use of machines that emit noise
may be limited to certain hours of the
day as specified by national and/or
regional or local regulations.
Anyone operating the machine must be
well rested, in good physical health and
in good mental condition.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
machine.
If you have a pacemaker: The ignition
system of your machine produces an
electromagnetic field of 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.
Anyone who has consumed alcohol or
drugs or medicines affecting their ability
to react must not operate a power tool.
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.
The machine must not be used for any
other purposes – 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 your
dealer. Use only high quality parts and
accessories. in order to avoid the risk of
accidents and damage to the machine.
STIHL recommends the use of original
STIHL tools and accessories. They are
specifically designed to match the
product and meet your performance
requirements.
Never attempt to modify your power tool
in any way since this may increase the
risk of personal injury. STIHL excludes
all liability for personal injury and
damage to property caused while using
unauthorized attachments.
Do not use a high-pressure washer to
clean the power tool. The solid jet of
water may damage parts of the unit.
The guard provided with your machine
may not protect the operator from all
foreign objects (gravel, glass, wire etc.)
ejected by the revolving cutting
attachment. Ejected objects may also
ricochet and strike the operator.
Clothing and equipment
Wear proper protective clothing and
equipment.
Clothing must be sturdy
but allow complete freedom of movement. Wear
close-fitting clothes such
as a boiler suit, not a
loose jacket.
Do not wear clothing
which could become
trapped in wood, brush or
moving parts of the
machine. Do not wear a
scarf, necktie or jewelry.
Tie up and confine long
hair above your
shoulders.
Wear safety boots with
steel toe caps and nonslip soles.
Sturdy shoes with non-slip shoes are
permissible only when using mowing
heads.
WARNING
To reduce the risk of eye
injuries, wear close-fitting safety glasses in
accordance with European Standard EN 166.
Make sure the safety
glasses are a snug fit.
Wear face protection and make sure it is
a good fit. Face protection alone is not
sufficient to protect the eyes.
Wear "personal" sound protection, e.g.
ear defenders.
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.
Wear sturdy protective
gloves made of a resistant material (e. g.
leather).
FS 131, FS 131 R
3
English
002BA079 KN
STIHL can supply a comprehensive
range of personal protective equipment.
Transporting the machine
Always stop the engine.
Carry the machine hanging on the
harness or by the shaft so that it is
balanced.
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".
Avoid touching hot parts
of the machine and gearbox – risk of burns!
By vehicle: When transporting in a
vehicle, properly secure your machine to
prevent turnover, damage and fuel
spillage.
Refueling
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.
Only refuel the machine in a well
ventilated place. If fuel has been spilled,
immediately clean the machine – do not
allow your clothes to be splashed with
fuel. If that happens, change your
clothes at once.
After refueling, close the
fuel cap as tightly as
possible.
This helps reduce the risk of unit
vibrations causing an incorrectly
tightened fuel cap to loosen or come off
and spill quantities of fuel.
Check for leaks. Do not start the engine
if there is a fuel leak – serious or fatal
burns could result!
Before starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the User
Manual.
– Check the fuel system for leaks,
especially the visible parts, e. g.,
fuel cap, hose connections, manual
fuel pump (only in machines with a
manual fuel pump). In case of
leakage and damage, do not start
the engine – risk of fire! Have the
machine serviced by a dealer
before using it
– Use only an approved combination
of cutting attachment, deflector,
handle and harness. All parts must
be assembled properly and
securely
– The stop switch must be easy to
push
– Check the choke lever, throttle
trigger and throttle trigger lockout
for smooth action - throttle trigger
must return automatically to idle
position. The choke lever must
spring back from the g and <
positions 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
sparking that could ignite
combustible fumes and cause a fire!
– Cutting attachment or
interchangeable attachment:
correctly fitted, secure and in
perfect condition
4
FS 131, FS 131 R
English
002BA055 KN
002BA080 KN
– Safety devices (e. g., deflector for
cutting attachments, rider plate) for
damage and/or wear. Always
replace damaged parts. Do not use
the machine with a damaged
deflector or worn rider plate (if the
writing and arrows are no longer
discernible)
– Never attempt to modify the controls
or safety devices
– Keep the handles dry and clean –
free from oil and dirt – this is
important for safe control of the
machine
– Adjust the harness and handle(s) to
suit your height and reach. Observe
the chapter "Fitting the Harness" –
"Balancing the machine"
To reduce the risk of personal injury, do
not operate your power tool if it is
damaged or not properly assembled!
To prepare for emergencies when using
a harness: Practice setting down the
machine quickly. To avoid damage, do
not throw the unit to the ground when
practicing.
Starting the engine
This is a one-person machine – ensure
that there is no-one within 15 meters of
the machine, not even when starting the
power tool! Risk of injury due to ejected
objects!
Avoid contact with the
cutting attachment – risk
of injury!
Do not drop-start the
power tool – start the
engine as described in
the User Manual. The
cutting attachment runs
on for a short while after
releasing the throttle trigger – coasting effect!
Check engine idling: The cutting
attachment must remain at a standstill
when the engine idles – throttle trigger
released.
Keep easily combustible materials
(e. g., wood chips, bark, dry grass, fuel)
away from hot exhaust gases and hot
muffler surfaces – risk of fire!
Holding and guiding the machine
For versions with bike handle
Right hand on control handle, left hand
on grip on handlebar.
For versions with loop handle
For versions with loop handle and loop
handle with barrier bar, left hand on the
loop handle, right hand on the control
handle – even if you are left-handed.
While working
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.
FS 131, FS 131 R
Always hold the unit firmly with both
hands on the handles.
Make sure you always have good
balance and secure footing.
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 by pressing the stop switch.
5
English
15m (50ft)
There is a risk of accident from ejected
objects within a wide area around the
working area, so you must ensure that
there is no-one within a 15 m radius of
the machine. This distance must also be
maintained in relation to objects
(vehicles, window panes) – risk of
property damage! Even at a distance
over 15 m, danger cannot be ruled out.
Check that the engine is properly idling
so that the cutting tool will not continue
rotating after you release the throttle
trigger.
Check and correct the idle speed setting
at regular intervals. If the cutting
attachment still rotates at idle speed,
have your dealer make proper
adjustments or repairs. STIHL
recommends you have this work done
by a STIHL servicing dealer.
Take special care in slippery conditions
– damp, snow, ice, on slopes or uneven
ground.
Watch out for obstacles: tree stumps,
roots – risk of tripping or stumbling!
Only work while standing on the ground,
never on a ladder or mobile elevated
work platform.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Take breaks when you start getting tired
or feeling fatigue – risk of accidents!
6
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Proceed with caution, do not put
others in danger.
As soon as the engine is
running, the power
machine generates toxic
exhaust gas.As soon as
the engine is running, the
power machine generates toxic exhaust gas.
These gases may be
odorless and invisible
and may contain
unburned hydrocarbons
and benzene. Never run
the engine indoors or in
poorly ventilated locations, even if your model
is equipped with a catalytic converter.
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.
Stop work immediately if you start
suffering from nausea, headaches,
impaired vision (e.g. your field of vision
gets smaller), impaired hearing,
dizziness, or impaired concentration –
these symptoms may possibly be the
result of too-high exhaust gas
concentration – Risk of accidents!
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. Combustible fuel vapor may
escape from the fuel system.
Dust, fumes and smoke produced while
working may be hazardous to health.
Wear respiratory protection in case of
heavy dust or smoke emission.
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 in particular that the fuel system
has no leaks and the safety equipment is
fully operative. Never use a power tool
that is no longer safe to operate. In case
of doubt, contact a dealer.
Do not operate your power tool in the
starting throttle position – engine speed
cannot be controlled in this position.
To reduce the risk
of injury from
ejected objects,
never operate the
unit without the
correct deflector
for the type of cutting attachment
being used.
Check the work site –
rocks, metal objects etc.
may be caught up and
ejected – possibly over a
distance of 15 m – risk of
injury! – They can also
damage the cutting
attachment and other
property (e. g. parking
vehicles, windows).
FS 131, FS 131 R
English
Be particularly careful when working on
difficult, densely grown terrain.
When mowing in high shrubbery, under
shrubbery and hedges: Hold the cutting
tool at a working height of at least 15 cm
– avoid risks to animals.
Always shut off the engine before
leaving the unit unattended.
Examine the cutting attachment
periodically at short intervals and as
soon as you note any noticeable
changes:
– Stop the engine, hold the machine
securely, allow the cutting
attachment to come to a stop
– Check condition and secure fitting;
watch out for cracks
– Ensure that the cutting blades are
sharp
– Replace damaged or blunt cutting
attachments immediately, even in
the event of minor hairline cracks
Clean grass and plant residue off the
cutting attachment mounting at regular
intervals – remove any accumulated
material from the cutting attachment and
deflector.
To reduce the risk of injury, shut off the
engine before replacing the cutting
attachment.
The gearbox gets hot
during operation. Never
touch the gearbox – risk
of burns!
If a rotating cutting attachment touches a
rock or another hard object, sparks can
occur which may possibly ignite
combustible materials. Also dried-out
plants and brushwood are combustible,
above all in hot and dry weather. If there
is a risk of fire, do not use cutting
attachments in the vicinity of
combustible materials, dried-out plants
or brushwood. It is mandatory that you
ask the responsible forestry office about
any current fire hazards.
Using mowing heads
Extend the cutting attachment deflector
with the attached parts specified in the
User Manual.
Only use a deflector with a properly fitted
blade, which limits the mowing line to the
permissible length.
For manually adjustable mowing heads,
always switch off the engine before
adjusting the mowing line – risk of injury!
Misuse with mowing lines that are too
long reduces the working speed of the
engine. The constant slipping of the
clutch causes overheating and damage
to important components (e. g. clutch,
plastic housing parts) – e. g. due to the
cutting attachment rotating during idling
– risk of injury!
When using metal cutting attachments
STIHL recommends the use of original
STIHL metal cutting attachments. These
have been optimized for the machine
and the user’s requirements.
Metal cutting attachments rotate very
fast, generating forces acting on the
attachments and on the cuttings.
Metal cutting attachments must be
sharpened in regular intervals in
accordance with the instructions.
Unevenly sharpened metal cutting
attachments generate an imbalance
which may cause extreme loads on the
machine – risk of breakage!
Dull or improperly sharpened cutting
edges can put a higher load on the
cutting attachment and increase the risk
of injuryfrom cracked or broken parts.
After each contact of the metal cutting
attachment with hard objects (e.g.
stones, rocks, metal parts), check it for
damage (e.g. tears and deformation). To
reduce the risk of injury, remove burrs
and other visible accumulated material
because they may become detached
and be ejected at high speed during
operation.
Do not continue using or attempt to
repair damaged or cracked cutting
attachments by means of welding,
straightening or modifying the shape
(unbalanced).
Particles or pieces may come off and hit
the operator or a bystander at a high
speed – risk of most severe injuries!
To reduce the above-named risks
involved in operating a metal cutting
attachment, ensure that the diameter of
your metal cutting attachment is not too
big. Also, the attachment must not be
too heavy. It must be made of highquality materials and have a suitable
geometry (shape, thickness).
A metal cutting attachment not made by
STIHL must not have a different weight,
thickness, shape or a larger diameter
FS 131, FS 131 R
7
English
than the largest STIHL metal cutting
attachment approved for this metal
cutting attachment – risk of injury!
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, 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.
8
FS 131, FS 131 R
English
000BA015 KN
Deflector may be used
with mowing heads.
Deflector must not be
used with mowing heads.
Deflector may be used
with grass cutting blades.
Deflector must not be
used with grass cutting
blades.
Deflector may be used
with brush knives.
Deflector must not be
used with brush knives.
Deflector must not be
used with shredder
blades.
Deflector must not be
used with circular saw
blades.
Shoulder Strap/Harness
The shoulder strap/harness is included
with the machine or available as a
special accessory.
N Use the shoulder strap/harness.
N With the engine running, attach the
machine to the shoulder
strap/harness.
Grass cutting blades and brush knives
must always be used in combination
with a shoulder strap.
Circular saw blades must always be
used in combination with a full harness
with a quick-release system.
Mowing Head with Nylon Line
0000-GXX-0498-A0
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
FS 131, FS 131 R
For mowing unobstructed edges of
meadows (without posts, fences, trees
or similar obstacles).
9
English
002BA049 KN
002BA135 KN
000BA020 KN
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
When using metal cutting 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.
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.
10
Brush Knife
For cutting matted grass, wild growth
and scrub and thinning young stands
with a stem diameter of no more than
2 cm – do not cut thicker stems – risk of
accidents.
FS 131, FS 131 R
English
002BA355 KN
002BA509 KN
002BA068 KN
Use the brushcutter like a scythe (sweep
it to the right and left) at ground level
when cutting grass and thinning young
stands.
To cut wild growth and scrub, lower the
brush knife down onto the growth to
achieve a shredding effect – always
keep the cutting attachment below hip
level during this process.
Exercise extreme caution when using
this method of cutting. The higher the
cutting attachment is off the ground, the
greater the risk of injury from cuttings
being thrown sideways.
Warning! Improper use of a brush knife
may cause it to crack, chip or shatter –
risk of injury from thrown parts.
To reduce the risk of injury it is essential
to take the following precautions:
– Avoid contact with stones, rocks,
pieces of metal and other solid
foreign objects.
– Never cut wood or shrubs with a
stem diameter of more than 2 cm –
use a circular saw blade for such
work.
– Inspect the brush knife at regular
short intervals for signs of damage.
Do not continue working with a
damaged brush knife.
– Resharpen the brush knife regularly
and whenever it has dulled
noticeably, and have it balanced if
necessary (STIHL recommends a
STIHL servicing dealer).
Circular Saw Blade
Suitable for cutting shrubs and trees with
a maximum stem diameter of 4 cm.
Before starting the cut, accelerate the
engine up to full throttle. Perform cut
with uniform pressure.
Use circular saw blades only with a
matching limit stop of the correct
diameter.
WARNING
To reduce the risk of blade damage,
avoid contact with stones and the
ground. Resharpen the blade properly in
good time – dull teeth may result in the
blade cracking and shattering and
causing serious injury.
When felling, maintain a distance of at
least two tree lengths from the next
felling site.
Risk of kickout
The risk of kickout is highest in the black
area of the blade: Do not use this area of
the circular saw blade for cutting.
There is also a risk of kickout when
using the lighter shaded areas of the
blade: These areas of the blade should
only be used by experienced operators
with specialized training.
STIHL recommends that you use the
non-shaded area of the circular saw
blade. Always start the cut with this area
of the blade.
FS 131, FS 131 R
11
English
10
11
6
1
2
3
8
9
12
14
15
16
17
18
19
28
28
26
27
28
26
25
27
29
31
31
30
30
31
32
13
5
4
7
24
23
22
21
20
0000099817_001
Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
Cutting attachment Deflector, limit stop Handle Carrying strap
12
FS 131, FS 131 R
English
Permissible combinations
Choose the correct combination from
the table depending on the cutting tool!
WARNING
For safety reasons only the cutting
attachments, deflector, handle and
harness versions within one line of the
table may be combined with one
another. No other combinations are
permitted because of the risk of
accidents!
Cutting attachments
Mowing heads
1 STIHL SuperCut 20-2
2 STIHL AutoCut C 25-2
3 STIHL AutoCut C 26-2
4 STIHL AutoCut 25-2/AutoCut 27-2
5 STIHL AutoCut 30-2
6 STIHL AutoCut 36-2
7 STIHL TrimCut 31-2
8 STIHL TrimCut 32-2
9 STIHL DuroCut 20-2
10 STIHL PolyCut 20-3
11 STIHL PolyCut 28-2
Metal cutting tools
12 Grass cutting blade 230-2
(230 mm dia.)
13 Grass cutting blade 260-2
(260 mm dia.)
14 Grass cutting blade 230-4
(230 mm dia.)
15 Grass cutting blade 230-8
(230 mm dia.)
16 Grass cutting blade 250-40 Spezial
(250 mm dia.)
17 Brush knife, 250-3
(250 mm dia.)
18 Circular saw blade 200 scratcher
tooth
(Ø 200 mm)
19 Circular saw blade 200-22 chisel
tooth (4112), circular saw blade
200-22 HP chisel tooth (4001)
WARNING
Grass cutting blades, brush knives and
circular saw blades of other, non-metal
materials must not be used.
Deflectors, limit stop
20 Deflector for mowing heads
21 Deflector with
22 Skirt and blade for mowing heads
23 Deflector without skirt and blade for
metal cutting attachments,
items 9 to 15
24 Limit stop for circular saw blades
Handles
25 Loop handle
26 Loop handle with
27 Barrier bar
28 Bike handle
Shoulder straps
29 Shoulder strap can be used
30 Shoulder strap must be used
31 Full harness can be used
32 Full harness must be used
FS 131, FS 131 R
13
English
1
7
A
250BA046 KN
Approved Power Tool
Attachments
The following STIHL attachments may
be used with the basic power tool:
Attachment
BF Cultivator
HL 145°
HT
RG
SP
1)
2)
3)
1)
1)
3)
1) 2)
Not approved for bike-handled
machines
Use handle hose supplied with the
machine
Use barrier bar on loop-handled
machines
Application
Long reach hedge
trimmer
Pole pruner
Weeder
Special harvester
Mounting the Bike Handle
Mounting Bike Handle with Swiveling
Handle Support
The machine is supplied with the
swiveling handle support already
mounted on the shaft. To mount the
handlebar it is necessary to remove the
clamp moldings.
Removing the Clamp Moldings
N Pull out the wing screw – the
washer (6) remains on the wing
screw.
N Separate the clamp moldings – the
springs (4 and 5) remain in the
lower clamp.
Securing the Handlebar
N Place the handlebar (7) in the lower
clamp (1) so that distance A is no
more than 15 cm (6 in).
N Place the upper clamp in position
and hold both clamp moldings
together.
N Push the wing screw through the
two clamps as far as stop – hold all
parts together and secure them.
14
N Hold the lower clamp (1) and upper
clamp (2) firmly together.
N Release the wing screw (3) – the
clamps are loose once the wing
screw has been released. They are
pushed apart by the two
springs (4 and 5).
FS 131, FS 131 R
Mounting the Control Handle
13
9
11
12
7
13
0000-GXX-0511-A0
10
15
English
14
8
N Place the secured assembly on the
handle support (8) with the wing
screw at the side nearest the
engine.
N Push the wing screw into the handle
support as far as stop and then
screw it down – but do not finally
tighten yet.
N Line up the handlebar at a right
angle to the drive tube – check
distance A again.
N Tighten down the wing screw firmly.
0000-GXX-0510-A0
N Take out the screw (9) – the nut (10)
remains in the control handle (11).
N Push the control handle onto the
handlebar (7) until the holes (13)
line up – the throttle trigger (12)
must point towards the gearbox.
N Insert the screw (9) and tighten it
down firmly.
Fitting the Throttle Cable
NOTICE
Do not kink the throttle cable or lay it in
tight radii – make sure the throttle trigger
moves freely.
14
15
15
0000-GXX-0512-A1
N Position the clamp (15) and handle
support (14) against the drive tube.
N Close the throttle cable
retainer (15). The retainer (15)
snaps into place.
Adjusting the Throttle Cable
N Check adjustment of throttle cable –
see chapter on "Adjusting the
Throttle Cable".
FS 131, FS 131 R
15
English
2
002BA098 KN
1
1
5
4
002BA099 KN
2
3
6
7
Swiveling the Handlebar
Transport position
90°
3
7
N Loosen the wing screw (3) and
unscrew it until the handlebar (7)
can be rotated.
N Rotate the handlebar 90°
counterclockwise and then swing
the handles down.
N Tighten down the wing screw (3)
firmly.
Working position
N Reverse the sequence described
above to swing the handles up and
turn the handlebar clockwise.
Mounting the Loop Handle
Mounting Loop Handle with Barrier Bar
0000-GXX-0513-A1
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 Position 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".
16
FS 131, FS 131 R
English
7
8
5
4
1
6
1
3
8
7
002BA614 KN
9
4
A
002BA615 KN
002BA655 KN
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 Position the clamp (6) against the
drive tube.
N Line up the holes.
N Fit 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.
N Go to "Securing the Loop Handle".
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 20 cm (8 in)
N Slide the handle to the required
position.
N Line up the loop handle (4).
N Tighten down the screws until the
loop handle can no longer be
rotated on the drive tube. If no
barrier bar is fitted – lock the nuts if
necessary.
The sleeve (9) (not fitted on all models)
must be between the loop handle and
the control handle.
Adjusting the Throttle Cable
It may be necessary to correct the
adjustment of the throttle cable after
assembling the machine or after a
prolonged period of operation.
Adjust the throttle cable only when the
unit is completely and properly
assembled.
N Set the throttle trigger to the full
throttle position.
N Carefully rotate the screw in the
throttle trigger in the direction of the
arrow until you feel initial resistance.
Then rotate it another half turn in the
same direction.
FS 131, FS 131 R
17
English
1
002BA529 KN
002BA636 KN
2
1
3
3
002BA637 KN
1.
2.
002BA646 KN
Fitting the Carrying Ring
Polymer Version
For position of carrying ring see "Main
Parts".
N Push the carrying ring (1) over the
drive tube.
N Insert the M5 nut in the hex recess
N Fit the M5x14 screw.
N Line up the carrying ring.
N Tighten down the screw firmly.
in the carrying ring.
Mounting the deflector
Mounting the Deflector
1 Deflector for mowing attachments
2 Deflector for mowing heads
Deflectors (1 and 2) are both mounted to
the gearbox in the same way.
N Place the deflector on the gearbox
flange.
N Insert the screws (3) and tighten
them down firmly.
Fitting the Skirt and Blade
WARNING
Risk of injury from thrown objects and
contact with the cutting attachment.
These parts must be fitted to the
deflector (1) when you use a mowing
head.
Fitting the Skirt
N Slide the lower guide slot of the skirt
onto the deflector – it must snap into
position.
Removing the Skirt
18
N Insert the stop pin into the hole in
the skirt and use it to push the skirt
to the left.
N Pull the skirt off the deflector.
FS 131, FS 131 R
English
002BA638 KN
7
002BA639 KN
6
002BA104 KN
2
002BA266 KN
Mounting the Blade
N Slide the line limiting blade into the
guide on the skirt.
N Insert the screw and tighten it down
firmly.
Mounting the Limit Stop
WARNING
Risk of injury from thrown objects and
contact with the cutting attachment.
Always fit the limit stop (6) when you use
a circular saw blade.
N Position the limit stop (6) on the
gearbox flange.
N Insert the screws (7) and tighten
them 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.
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 with mounting
hardware
Mowing heads and metal cutting
attachments may be mounted.
3
2
1
0000-GXX0500-A0
Depending on the cutting attachment, it
may be necessary to use the nut (3) and
rider plate (2). The thrust plate (1) must
be used with all cutting attachments.
These parts are included in a kit
supplied with the machine and are also
available as special accessories.
Machine supplied without mounting
hardware
Only mowing heads may be used which
mount directly to the shaft (2).
FS 131, FS 131 R
19
English
6
7
2
002BA330 KN
6
0000-GXX-1323-A0
4
1
2
3
5
6
1
0000-GXX-1324-A0
2
3
4
Blocking the Shaft
The output shaft (2) must be blocked
with the stop pin (6) or screwdriver (6) to
mount or remove cutting attachments.
These parts come standard with the
machine or are available as special
accessories.
N Insert the stop pin (6) or
screwdriver (6) in the hole (7) in the
gearbox as far as stop – and apply
slight pressure.
N Rotate shaft, nut or cutting
attachment until the stop pin slips
into position and blocks the shaft.
Removing the Mounting Hardware
N Block the shaft (5) with the stop pin
(1).
N Use the combination wrench (2) to
loosen and remove the nut (3)
clockwise (left-hand thread).
N Take the rider plate (4) off the
shaft (5). Do not remove the thrust
plate (6).
Mounting the Cutting Attachment
WARNING
Risk of injury from thrown objects and
contact with the cutting attachment. 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.
N Fit the thrust plate (1).
N Screw the mowing head (3)
counterclockwise on to the shaft (4)
as far as stop.
N Block the shaft (4) with the stop pin
(2).
N Tighten down the mowing head (3)
firmly.
NOTICE
Remove the tool used to block the shaft.
20
FS 131, FS 131 R
English
1
681BA303 KN
2
3
4
5
6
7
8
8
9
10
11
13
14
0000-GXX-0502-A0
12
Remove the mowing head.
N Block the shaft (4) with the stop pin
(2).
N Unscrew and remove the mowing
head (3) clockwise.
Mounting Metal Cutting Attachments
Keep the leaflet and packaging of the
metal cutting attachment in a safe place.
WARNING
Wear protective gloves to reduce the
risk of direct contact with the sharp
cutting edges.
Mount only one metal cutting
attachment.
Check direction of rotation of cutting
attachment
Cutting attachments 2, 4, 5 and 6 may
be mounted either way round – they
must be turned over regularly to help
avoid one-sided wear.
The cutting edges of cutting
attachments 1, 3, 7 and 8 must point
clockwise.
Direction of rotation is indicated by an
arrow on the inside of the deflector.
N Fit the thrust plate (9).
N Place the cutting attachment (8) on
the thrust plate (9).
Collar (see arrow) must engage the
cutting attachment's mounting hole.
Securing the cutting attachment
N Fit the rider plate (10).
N Block the shaft (11) with the stop pin
(12).
N Use the combination wrench (14) to
screw the mounting nut (13) on to
the output shaft counterclockwise
and tighten it down firmly.
FS 131, FS 131 R
WARNING
There is a risk of injury if the cutting
attachment works loose. If the mounting
nut has become too loose, fit a new one.
21
English
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 (11) with the stop pin
(12).
N Unscrew the mounting nut (13)
clockwise.
N Remove cutting attachment and its
mounting hardware from the
gearbox – but do not remove the
thrust plate (9).
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
Fuel with an octane rating below 89 may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline.
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects
engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.
WARNING
To reduce the risk of personal injury
from loss of control and / or contact with
the running cutting tool, do not use your
unit with incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your power tool´s idle speed is
incorrectly adjusted, have your
authorized STIHL servicing dealer
check your machine and make the
proper adjustments and repairs.
The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to
another fuel with a much higher or lower
ethanol content.
This problem can be avoided by always
using fuel with the same ethanol
content.
To ensure the maximum performance of
your STIHL engine, use a high quality 2cycle engine oil, such as STIHL 2-cycle
engine oils. STIHL 2-cycle engine oils
are specially designed for STIHL
engines. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil, or
use an equivalent high quality 2-cycle
engine oil.
To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil or equivalent.
Do not use NMMA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
22
FS 131, FS 131 R
English
0000-GXX-0476-A0
002BA447 KN
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.
The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.
The machine’s fuel tank should be
cleaned as necessary.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. STIHL MotoMix has a high
octane rating and ensures that you
always use the right gasoline/oil mix
ratio.
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil suited for high
performance engines.
For further details, see
www.STIHLusa.com/ethanol
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
20 0.40 (400)
US gal. US fl. oz.
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
tank cap faces up.
Opening the Tank Cap
Fuel mix ages
If not using STIHL MotoMix, only mix
sufficient fuel for a few days of work, not
to exceed 30 days of storage. Store in
approved fuel-containers only. When
mixing, pour oil into the container first,
and then add gasoline. Close the
container and shake it vigorously by
hand to ensure proper mix of oil and
gasoline.
FS 131, FS 131 R
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the tank cap.
23
English
002BA448 KN
1
0000-GXX-0503-A0
2
3
0000-GXX-0504-A0
2
1
Filling Up with Fuel
Take care not to spill fuel while fueling
and do not overfill the tank.
STIHL recommends you use the STIHL
filler nozzle for fuel (special accessory).
N Fill up with fuel.
Closing the Tank Cap
N Place the cap in the opening.
N Turn the cap clockwise as far as
stop and tighten it down as firmly as
possible by hand.
Fitting the Harness
The type and style of the
harness/shoulder strap 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
Full Harness
N Put on the harness (1) and close the
locking plate (3).
N Adjust the length of the strap – with
the machine attached, the
carabiner (2) must be about a
hand's width below your right hip.
N Balance the machine – see
"Balancing the Machine".
24
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 – see
"Balancing the Machine".
FS 131, FS 131 R
Balancing the Machine
1
002BA660 KN
2
1
1
2
2
002BA662 KN
1
2
A
002BA034 KN
B
002BA035 KN
002BA661 KN
2
1
1
1
2
2
Attaching Machine to Harness
English
Circular saw blades (B)
N should "hover" about 20 cm (8 in)
above the ground.
When the correct balanced position has
been reached:
N Tighten down the screw (1) on the
carrying ring firmly.
The type and style of the shoulder strap
and carabiner depend on the market.
N Attach the carabiner (1) to the
carrying ring (2) on the drive tube.
Balancing the Machine
The unit is balanced differently
depending on the cutting attachment
used.
Proceed as follows until the conditions
specified under "Floating positions"
have been met:
FS 131, FS 131 R
N Loosen the screw (1).
N Slide the carrying ring (2) along the
drive tube.
N Tighten the screw (1) moderately.
N Allow the unit to hang freely.
N Check the position obtained:
Balanced positions
Mowing tools (A) such as mowing
heads, grass cutting blades and brush
knives
N should just touch the ground.
Disconnecting Machine from Harness
N Press down the bar on the
carabiner (1) and pull the carrying
ring (2) out of the carabiner.
25
English
2
1
3
0000-GXX-0477-A0
0000-GXX-0478-A0
Starting / Stopping the
Engine
Controls
Version with Bike Handle
3
2
1
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop
positions. Depress the stop switch
(…) to switch off the ignition – see
"Function of stop switch and ignition
system".
Version with Loop Handle
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop
positions. Depress the stop switch
(…) to switch off the ignition – see
"Function of stop switch and ignition
system".
Function of stop switch and ignition
system
The ignition is switched off and the
engine stopped when the stop switch is
pressed. The stop switch returns
automatically to the Run position when it
is released: The ignition is switched on
0000-GXX-0494-A0
again after the engine stops – the engine
is then ready to start.
Starting the Engine
N Press the manual fuel pump
bulb (9) at least five times – even if
the bulb is already filled with fuel.
N Press in the choke knob (8) and turn
it to the position that suits the engine
temperature:
g if the engine is cold
< for warm start – also use this posi-
tion if the engine has been running
but is still cold.
The choke knob must engage in
position.
26
FS 131, FS 131 R
English
0000-GXX-0479-A0
0000-GXX-0480-A0
0000-GXX-0481-A0
002BA664 KN
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 or
lockout lever – your thumb should
be under the fan housing.
N Hold the starter grip with your right
hand.
N Pull the starter grip slowly until you
feel it engage and then give it a brisk
strong pull.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
As soon as the engine runs
N Press down the throttle trigger
lockout and open the throttle – the
choke knob moves to the run
position F. After a cold start, warm
up the engine by opening the
throttle several times.
WARNING
There is a risk of injury if the cutting
attachment runs when the engine is
idling. Adjust the carburetor so that the
cutting attachment does not run when
the engine is idling – see “Adjusting the
Carburetor”.
Your machine is now ready for
operation.
NOTICE
Do not stand or kneel on the drive tube.
FS 131, FS 131 R
27
English
681BA268 KN
681BA269 KN
Stopping the Engine
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Other Hints on Starting
Engine stalls in cold start position g or
under acceleration.
N Move the choke knob to < and
continue cranking until the engine
runs.
Engine does not start in warm start
position <
N Move the choke knob to g and
continue cranking until the engine
runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Engine is flooded
N Move the choke knob to F and
continue cranking until the engine
runs.
Fuel tank run until completely dry
N After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
N Set the choke lever to suit the
engine temperature.
N Now start the engine.
Transporting the Unit
Using Transport Guard
The type of transport guard depends on
the metal cutting attachment supplied
with the machine. Transport guards are
available as special accessories.
230 mm Grass Cutting Blades
28
FS 131, FS 131 R
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