Stihl FS 70 User Manual
STIHL FS 70
{
Instruction Manual
Manual de instrucciones
Warning!
Read and follow all safety precautions in
Instruction Manual – improper use can cause
serious or fatal injury.
Advertencia!
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
1 - 40
Manual de
instrucciones
41 - 86
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 15
Mounting the Loop Handle 16
Mounting the Deflector 17
Mounting the Cutting Attachment 18
Original Instruction ManualPrinted on chlorine-free paper
Fuel 20
Fueling 21
Fitting the Harness 22
Starting / Stopping the Engine 23
Operating Instructions 25
Cleaning the Air Filter 25
Engine Management 26
Adjusting the Carburetor 26
Spark Plug 27
Engine Running Behavior 28
Rewind Starter 29
Storing the Machine 29
Sharpening Metal Cutting Blades 29
Printing inks contain vegetable oils, paper can be recycled.
Inspections and Maintenance by
Dealer 30
Maintenance and Care 31
Main Parts 32
Specifications 34
Special Accessories 35
Maintenance and Repairs 35
STIHL Incorporated Federal
Emission Control Warranty
Statement 35
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 37
Trademarks 39
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 and understand and follow the
maintenance and safety precautions 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 highspeed 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, 2009
0458-570-8621-A. M16-75.L09.CP.
0000001656_006_GB
FS 70 RC
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English
Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in this
manual.
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
without direct reference to an
illustration.
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.
Warning!
Indicates a hazardous situation which, if
not avoided, could result in severe or
fatal injury.
Caution!
Indicates a risk of property damage,
including damage to the machine or its
individual components.
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 differ from those
described in this manual, please contact
your STIHL dealer for assistance.
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 fact that different types of cutting
attachments 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.
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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.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Safe use of a trimmer/brushcutter
involves
1. the operator
2. the power tool
3. the use of the power tool.
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
FS 70 RC
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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.
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.
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.
Warning!
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 gloves
when handling the
machine and metal
blades. Heavy-duty, non-
slip 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 jack-
ets, 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.
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Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended. Do
not wear sandals or go
barefoot.
Wear an approved safety
hard hat to reduce the
risk of injury to your head
when there is a danger of
head injuries.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts and Controls."
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 "Power Tools and 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.
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!
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 oilgasoline 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 seri-
ous 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.
389BA019 KN
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Fueling Instructions
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.
Cap with Grip
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.
To do this with this STIHL
cap, raise the grip on the
top of the cap until it is
upright at a 90° angle.
Insert the cap in the fuel
tank opening with the triangular marks on the grip
of the cap and on the fuel
tank opening lining up.
Using the grip, turn the
cap firmly clockwise as
far as it will go (approx. a
quarter turn.)
Fold the grip flush with
the top of the cap. If the
grip does not lie completely flush with the cap
and the detent on the grip
does not fit in the corresponding recess in the
filler opening, the cap is
not properly seated and
tightened and you must
repeat the above steps.
Before Starting
Warning!
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, 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. Never use a
power tool that is damaged or not properly maintained.
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.
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FS 70 RC
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 Attachments" of your
instruction manual.)
A
B
Arrows on the deflector (A) and limit
stop (B) (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.
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.
000BA006 KN
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, engine
speed will be fast enough for the clutch
to engage and move the cutting
attachment.
000BA007 KN
Once the engine has started,
immediately blip the throttle trigger,
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 (see appropriate
chapter of this manual.)
Warning!
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
Warning!
To reduce the risk of injury from loss of
control, do not attempt to "drop start"
your power tool.
English
FS 70 RC
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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 setting lever 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, keeping the
handles cradled between your thumb
and forefinger. Keep your hands in this
position to have your power tool under
control at all times. Make sure your
trimmer handles and grips are in good
condition and free of moisture, pitch, oil,
fuel mix or grease
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
002BA257 KN
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
002BA273 KN
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.
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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
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, as you do not
have control of the engine speed.
In the event of an emergency, switch off
the engine immediately – move the slide
control / 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.
15m (50ft)
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
50 feet (15 m) away. To reduce the risk
of damage to property, also maintain this
distance from such objects as vehicles
or windows. Any coworkers who must be
in the restricted area should also wear
goggles or protective glasses. Stop the
engine immediately if you are
approached.
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Warning!
Before you start work,
examine the area for
stones, glass, fence wire,
metal, trash or other solid
objects. The cutting
attachment could throw
objects of this kind.
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 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 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!
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.
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Warning!
To reduce the risk of fire and burn injury,
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 sitting
on concrete, metal, bare ground or solid
wood away from any combustible
substances.
Warning!
Never modify your muffler. The muffler
could be damaged and cause an
increase in heat radiation or sparks,
thereby increasing the risk of fire and
burn injury. You may also permanently
damage the engine. Have your muffler
serviced and repaired by your STIHL
servicing dealer only.
Catalytic Converter
Warning!
Some STIHL power tools
are equipped with a catalytic converter, which is
designed to reduce the
exhaust emissions of the
engine by a chemical
process in the muffler. Due to this process, the muffler does not cool down as
rapidly as conventional mufflers when
the engine returns to idle or is shut off.
To reduce the risk of fire and burn injuries, the following specific safety
precautions must be observed.
Warning!
Since a muffler with a catalytic converter
cools down less rapidly than conventional mufflers, always set your power
tool down in the upright position and
never locate it where the muffler is near
dry brush, grass, wood chips or other
combustible materials while it is still hot.
Warning!
An improperly mounted or damaged cylinder housing or a damaged / deformed
muffler shell may interfere with the cooling process of the catalytic converter.
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 catalytic converter is furnished with
screens designed to reduce the risk of
fire from the emission of hot particles.
Due to the heat from the catalytic
reaction, these screens will normally
stay clean 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.
USING THE CUTTING ATTACHMENT
For an illustration of the various cutting
attachments and instructions on proper
mounting see the chapter on "Mounting
the Cutting Attachments" 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.
002BA354 KN
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 "Parts and Controls" chapter
in your instruction manual.)
FS 70 RC
11
English
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.)
STIHL TrimCut mowing head
Frayed line is replaced by a simple
adjustment (see instruction sheet
supplied with mowing head.)
STIHL AUTOCUT mowing head
Nylon cutting cord advances
automatically when tapped against the
ground (TapAction.)
STIHL PolyCut mowing head
Uses either nylon lines or nonrigid,
pivoting polymer blades.
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.
002BA177 KN
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.
002BA135 KN
12
FS 70 RC
English
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.
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
002BA355 KN
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. If your muffler was equipped with a
spark-arresting screen to reduce the
risk of fire, never operate your power
tool if the screen is missing or damaged.
Remember that the risk of forest fires is
greater in hot or dry weather.
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.
FS 70 RC
13
English
Keep blades sharp. Tighten all nuts,
bolts and screws, except the carburetor
adjustment screws, after each use.
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
FS 70 RC
Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
Cutting Attachment Deflector Handle Harness
English
1
2
11
9
3
4
14
16
12
13
5
6
10
7
8
12
13
15
16
0414BA005 KN
FS 70 RC
15
English
Approved Combinations
The complete combination includes:
– Cutting Attachment
– Deflector
– Handle
– Harness
Select correct combination from the
table according to the cutting
attachment you intend to use. Read the
table horizontally from left to right.
Cutting Attachments
Mowing heads
1 STIHL SuperCut 20-2 mowing head
2 STIHL Autocut C 25-2 mowing head
3 STIHL Autocut 25-2 mowing head
4 STIHL TrimCut 31-2 mowing head
5 STIHL PolyCut 20-3 mowing head
6 STIHL FixCut 25-2 mowing head
Metal cutting attachments
7 Grass cutting blade 230-4
8 Grass cutting blade 230-8
Non-metal grass cutting blades
are not approved.
Deflectors
Handles
11 Loop handle
12 Loop handle with
13 Barrier bar
Harnesses
14 Shoulder strap may be used
15 Shoulder strap must be used
16 Full harness may be used
Warning!
Based on the cutting attachment being
used:
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
547BA004 KN547BA005 KN
A factory-new machines comes with the
loop handle aready mounted.
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.
9 Deflector with blade for mowing
heads only
10 Deflector for grass cutting blades
only
16
FS 70 RC
English
Mounting the barrier bar
0.2 in
(5,3 mm)
1
2
3
N Fit the washer (1) on the M5x23
screw (2).
N Hold the barrier bar (3) against the
loop handle and insert the screw
with washer.
N Tighten down the screw (2) firmly.
Leave the barrier bar permanently
mounted to the loop handle.
Adjusting and securing the loop
handle
A
The loop handle can be adjusted to suit
the height and reach of the operator and
the application by changing
distance (A).
Recommended distance (A): about
14 in (35 cm)
N Loosen the screw on the handle.
547BA031 KN
N Slide the handle to the required
position.
N Tighten down the screw so that the
handle cannot be rotated on the
drive tube.
Mounting the Deflector
Use the right deflector
1
547BA007 KN
002BA262 KN
Deflector (1) is approved for
mowing heads only and must
therefore be mounted before
fitting a mowing head
2
002BA263 KN
Deflector (2) is approved for grass
cutting blades only and must
therefore be mounted before
fitting a grass cutting blade.
FS 70 RC
Mounting the Deflector
Deflectors (1) and (2) are both mounted
to the gearbox in the same way.
17
English
N Position the deflector against the
gearbox so that the lug (3) engages
the recess (4) in the deflector.
N Insert the screw (5) and tighten it
down firmly.
Mounting the Cutting
Attachment
The new machine comes from the
factory wirth the cutting attachment
already mounted.
Note the following points when mounting
other approved cutting attachments –
0414BA007 KN
see "Approved Combinations of Cutting
Attachment, Deflector, Handle,
Harness":
Preparations
N Lay your brushcutter on its back so
that the cutting attachment
mounting face is facing up.
Block the shaft.
The stop pin or screwdriver (2) are either
supplied with the machine or available
as special accessories.
N Insert the stop pin (2) or
screwdriver (2) in the hole (3) in the
gearbox as far as stop – and apply
slight pressure.
N Rotate nut or cutting attachment on
the shaft until the stop pin slips into
position and blocks the shaft.
Mounting the cutting attachment
Use a deflector that matches the
cutting attachment – see
"Mounting the Deflector".
N Go to "Mounting the Mowing Head"
or "Mounting the Metal Cutting
Attachment".
Mounting the mowing head
002BA342 KN
Keep the instruction sheet for the
mowing head in a safe place.
STIHL SuperCut 20-2,
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
18
1
3
2
The output shaft (1) must be blocked
with the stop pin (2) or screwdriver (2) to
mount or remove cutting attachments.
2
002BA346 KN
FS 70 RC
English
STIHL TrimCut 31-2,
STIHL FixCut 25-2,
STIHL PolyCut 20-3
1
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.
Remove the tool used to block the
shaft.
Removing the mowing head
N Block the shaft.
STIHL SuperCut 20-2,
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
STIHL TrimCut 31-2,
STIHL FixCut 25-2,
STIHL PolyCut 20-3
N Unscrew the mowing head
clockwise.
Adjusting nylon line
STIHL SuperCut
Fresh line is advanced automatically if
remaining line is still at least 2.4 in
(6 cm) long. The blade on the deflector
trims surplus line to the correct length.
STIHL AutoCut
N Hold the rotating mowing head
above the ground – tap it on the
ground once – about 1.2 in (3 cm)
fresh line is advanced.
002BA081 KN
The blade on the deflector trims surplus
line to the correct length – avoid tapping
the mowing head more than once at a
time.
Line feed operates only if both lines still
have a minimum length of 1in (2.5cm).
All other mowing heads
Refer to the instructions supplied with
the mowing head.
To reduce the risk of injury, always
shut off the engine before
adjusting the mowing line by
hand.
Replacing nylon line or cutting
blades
Refer to the instructions supplied with
the mowing head.
Mounting metal cutting attachments
1
2
3
The nut (1), rider plate (2) and thrust
washer (3) are required to mount a
grass cutting blade. The parts are
available as special accessories.
Check direction of rotation of cutting
attachment
1
Cutting edges of grass cutting blade (1)
may point in either direction.
Cutting edges of grass cutting blade (2)
must point clockwise.
2
002BA347 KN
681BA108 KN
FS 70 RC
19
English
Direction of rotation is indicated by
an arrow on the inside of the
deflector.
6
4
3
5
1
2
N Place the cutting attachment (1) on
the thrust plate (2).
Collar (see arrow) must engage
the cutting attachment's mounting
hole.
Securing the cutting attachment
N Fit the thrust washer (3) and rider
plate (4) on the shaft (5).
N Block the shaft and screw the
mounting nut (6) on to the shaft
counterclockwise and tighten it
down firmly.
If the mounting nut turns too
freely, fit a new one.
Removing the metal cutting
attachment
N Block the shaft.
N Unscrew the mounting nut
clockwise.
N Take the parts off the shaft – do not
remove the thrust plate (2).
681BA117 KN
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 quality two-stroke
air cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 (R+M/2). If
the octane rating of the mid-grade
gasoline in your area is lower, use
premium unleaded fuel.
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
nationally recognized high-quality
unleaded gasoline!
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 50:1 two-stroke
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
20
FS 70 RC
English
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the canister from
your vehicle and place the canister on
the ground before filling. Do not fill fuel
canisters that are sitting in or on a
vehicle.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The machine‘s fuel tank and the canister
in which fuel mix is stored should be
cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved fuel-canisters only.
When mixing, pour oil into the canister
first, and then add gasoline. Close the
canister and shake it vigorously by hand
to ensure proper mixing of the oil with
the fuel.
Gasoline
Oil (STIHL 50:1 or equivalent high-quality oils)
US gal. US fl.oz
12.6
2 1/2 6.4
512.8
Dispose of empty mixing-oil canisters
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.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
N Position the machine so that the
filler cap is facing up.
In order to reduce the risk of burns
or other personal injury from
escaping gas vapor and fumes,
remove the fuel filler cap carefully
so as to allow any pressure buildup in the tank to release slowly
Opening the cap
N Raise the grip until it is upright.
547BA009 KN
N Turn the cap counterclockwise
(approx. a quarter turn).
N Remove the filler cap.
Fueling
Take care not to spill fuel while fueling
and do not overfill the tank.
547BA010 KN
547BA011 KN
FS 70 RC
21
English
Closing the cap
N Fit the cap – grip upright –marks
must line up.
N Turn the cap clockwise as far as
stop (approx. a quarter turn).
N Fold the grip flush with the top of the
cap.
If the grip does not lie completely flush
with the cap and the detent on the grip
does not engage the recess in the filler
neck, the cap is not properly seated and
tightened and you must repeat the
above steps.
Change the fuel pickup body
547BA012 KN
Change the fuel pickup body every year.
N Open the filler cap and drain the fuel
547BA013 KN
tank.
N Use a hook to pull the fuel pickup
body out of the tank and take it off
the hose.
Do not kink the fuel hose – do not
use any sharp or pointed tools.
N Push the new pickup body into the
hose.
N Place the pickup body in the tank
and close the filler cap.
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
1
547BA014 KN
2
0414BA009 KN
N Put on the shoulder strap (1).
N Adjust the length of the strap so that
the spring hook (2) is about a hand’s
width below your right hip.
22
FS 70 RC
English
Full harness
1
2
N Put on the full harness (1).
N Adjust the length of the strap so that
the spring hook (2) is about a hand’s
width below your right hip.
Starting / Stopping the
Engine
Controls
3
0414BA010 KN
1
2
1 Throttle trigger interlock
2 Throttle trigger
3 Stop switch with Run and 0 =Stop
positions.
Starting the engine
4
547BA015 KN
N Press the bulb (4) of the fuel
pump (P) at least five times – even
if the bulb is already filled with fuel.
Cold engine (cold start)
5
0414BA011 KN
547BA016 KN
N Press in the choke lever (5) and turn
it to g at the same time.
Warm engine (warm start)
FS 70 RC
Function of stop switch and ignition
system
The stop switch is normally in the Run
position: Ignition is on in this position –
the engine is ready to start and may be
started. If the stop switch is moved to the
0 position, the ignition is switched off. It
is automatically switched on again after
the engine comes to a standstill.
5
547BA017 KN
N Press in the choke lever (5) and turn
it to < at the same time.
23
English
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the unit on the ground: It must
rest securely on the engine support
and the deflector. Check that the
cutting attachment is not touching
the ground of any other obstacles.
N Make sure you have a firm footing.
N Hold the unit firmly on the ground
with your left hand and press down
– do not touch the throttle trigger or
interlock lever.
Do not stand or kneel on the drive
tube.
0414BA012 KN
N Hold the starter grip with your right
hand.
N Pull the starter grip steadily.
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 interlock lever and
open the throttle – the choke lever
moves to the run position F . After a
cold start, warm up the engine by
opening the throttle several times.
Make sure the carburetor is
0414BA013 KN
correctly adjusted. The cutting
attachment must not rotate when
the engine is idling.
Your machine is now ready for
operation.
Shut odd the engine.
N Move the stop switch in the direction
of 0 – the engine stops – release
the stop switch – it springs back to
the run position.
Other hints on starting
0414BA014 KN
24
Engine stalls in cold start position g
or under acceleration
N Move the choke lever to < and
continue cranking until the engine
runs.
FS 70 RC
English
Engine does not start in warm start
position <
N Move the choke lever 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.
Fuel tank run until completely dry
N After refueling, press the bulb of the
fuel pump (P) at least five times –
even if the bulb is filled with fuel.
N Set the choke lever to suit the
engine temperature.
N Start the engine.
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
3
2
1
N Move the choke lever (1) to <.
N Turn the screw (2) in the filter
cover (3) counterclockwise until the
cover is loose.
N Ease the filter cover (3) over the
choke lever and lift it away.
N Clean away loose dirt from around
the filter.
547BA022 KN
FS 70 RC
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 perionds – see "Storing the
Machine".
25
English
4
N Reach into the recess (4) in the filter
housing and take out the felt
filter (5).
N Fit a new felt filter element (5). As a
temporary measure you can knock it
out on the palm of your hand or blow
it out with compressed air. Do not
wash.
Replace damaged parts.
N Fit the felt filter (5) in the filter
housing, make sure it is properly
seated – the arrow points to the
recess.
N Move the choke lever (1) to <.
N Fit the filter cover in position,
making sure the screw is square.
Tighten down the screw.
Engine Management Adjusting the Carburetor
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
547BA023 KN
major hardware.
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
make corrections with the adjusting
screws within fine limits.
Standard Setting
N Shut odd the engine.
N Mount a cutting tool – we
recommend you use a mowing
head.
N Check the air filter and replace the
element if necessary.
N Have the spark arresting screen
(not all markets) checked – see
“Inspection and Maintenance by
Dealer"
26
547BA024 KN
N Turn the high speed screw (H)
counterclockwise as far as stop
(max. 3/4 turn possible).
N Turn the low speed screw (L)
counterclockwise as far as stop
(max. 3/4 turn possible).
FS 70 RC
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