Stihl FS 90, FS 90 R Instruction Manual
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BA_FS90_86_U_J5.book Seite 0 Donnerstag, 29. September 2005 11:30 11
STIHL FS 90
STIH)
Instruction Manual
Manual de instrucciones
Warning!
For safe operation follow all safety precautions in Instruction Manual - improper use can cause serious injury.
Advertencia!
Para su seguridad durante el manejo de este producto, siga siempre las precauciones de seguridad dadas en el manual de instrucciones - el uso indebido puede causar lesiones graves.
English / USA
Contents
Guide to Using this Manual .............. 2
Safety Precautions and
Working Techniques ......................... 3
Approved Combinations of
Cutting Tool, Deflector,
Handle and Harness ....................... 20
Approved Power
Tool Attachments ............................ 22
Mounting the Bike Handle .............. 22
Mounting the Loop Handle ............. 24
Adjusting the Throttle Cable ........... 26
Fitting the Carrying Eye .................. 26
Mounting the Deflector ................... 27
Mounting the Cutting Tools ............. 28
4-MIX Engine .................................. 32
Fuel ................................................ 32
Fueling ............................................ 33
Fitting the Harness ......................... 34
Balancing the Brushcutter .............. 35
Starting / Stopping the Engine ...................................... 36
Cleaning the Air Filter ..................... 39
Motor Management ........................ 39
Adjusting the Carburetor ................ 40
Spark Arresting
Screen in Muffler ............................ 41
Checking the Spark Plug ................ 42
Lubricating the Gearbox ................. 43
Replacing Starter Rope and Rewind Spring ......................... 43
Storing the Machine ....................... 46
Sharpening
Metal Cutting Tools ......................... 47
Inspections and Maintenance by Dealer ........................................ 47
Maintenance Chart ......................... 48
Parts and Controls ......................... 50
Specifications ................................. 53
Special Accessories ....................... 53
Maintenance and Repairs .............. 54
STIHL Incorporated
Federal Emission Control
Warranty Statement ........................ 55
STIHL Incorporated California
Exhaust and Evaporative Emissions
Control Warranty Statement ........... 57
Trademarks .................................... 59
Allow only persons who 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 the maintenance and safety precautions, starting on page 3, before using your trimmer/brushcutter.
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.
STIHL's philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. If the operating characteristics or the appearance of your trimmer/brushcutter differs from those described in this manual, please contact your STIHL dealer for information and assistance.
STIHl
FS 90, FS 90 R 1
English / USA
Guide to Using this Manual
Pictograms
All the pictograms attached to the machine are shown and explained in this manual.
The operating and handling instructions are supported by illustrations.
Symbols in text
The individual steps or procedures described in the manual may be marked in different ways:
: 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:
Loosen the screw ( 1 )
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 described below:
Warning where there is a risk of an accident or personal injury or serious damage to property.
Caution where there is a risk of damaging the machine or its individual components.
Note or hint which is not essential for using the machine, but may improve the operator’s understanding of the situation and result in better use of the machine.
Note or hint on correct procedure in order to avoid damage to the environment.
Equipment and features
This instruction manual may refer to several models with different features. Components that are not installed on all models and related applications are marked with an asterisk (*). Such components may be available as special accessories from your STIHL dealer.
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. If the operating characteristics or the appearance of your machine differ from those described in this manual, please contact your STIHL dealer for assistance.
Therefore some changes, modifications and improvements may not be covered in this manual.
2 FS 90, FS 90 R
English / USA
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.
The term "clearing saw" indicates a high-powered trimmer/brushcutter that is particularly suited for use with a circular saw blade to clear saplings or small trees. 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, brush, wood and similar material. It must not be used for any other purposes, since such misuse may result in an accident or 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.
FS 90, FS 90 R 3
English / USA
!
Warning!
To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it.
Most of these safety precautions and warnings apply to the use of all STIHL trimmer/brushcutters. Different models may have different parts and controls.
See the appropriate section of your instruction manual for a description of the controls and the function of the parts of your model.
Safe use of a trimmer/brushcutter involves
1. the operator
2. the power tool
3. the use of the power tool.
THE OPERATOR
Physical Condition
You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued.
!
Warning!
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine.
!
Warning!
Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome.
These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.
All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:
Most STIHL power tools are available with an anti-vibration (“AV”) system designed to reduce the transmission of vibrations created by the machine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis.
4 FS 90, FS 90 R
English / USA
Keep the AV system well maintained. A power tool with loose components or with damaged or worn AV buffers will tend to have higher vibration levels.
Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressure. Wear gloves and keep your hands warm. 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.
!
Warning!
To reduce the risk of injury to your eyes never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with ANSI
Z 87.1 (or your applicable national standard). To reduce the risk of injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.
!
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, nonslip gloves improve your grip and help to protect your hands.
Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear long pants made of heavy material to help protect your legs. Do not wear shorts, sandals or go barefoot.
FS 90, FS 90 R 5
English / USA
Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become caught on branches, brush or the moving parts of the unit. Secure hair so it is above shoulder level.
Good footing is very important. Wear sturdy boots with nonslip soles.
Steel-toed safety boots are recommended.
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.
6 FS 90, FS 90 R
English / USA
!
Warning!
Always shut off the engine and make sure the cutting attachment has stopped before putting a trimmer/brushcutter down. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit.
STIHL recommends that you keep metal blades covered with the transport guard
(optional accessory).
Fuel
Your STIHL power tool uses an oil- gasoline mixture for fuel (see the chapter on “Fuel” of your instruction manual).
!
Warning!
Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combustible fuel vapor may escape from the fuel system.
Fueling Instructions
!
Warning!
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, 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.
Different models may be equipped with different fuel caps.
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 neck, the cap is not properly seated and tightened and you must repeat the above steps.
FS 90, FS 90 R 7
English / USA
Screw cap
!
Warning!
Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quantities of fuel. In order to reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand as securely as possible.
Before Starting
!
Warning!
Always check your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger interlock, 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, grease or resin in order for you to maintain a firm grip and properly control your power tool.
!
Warning!
Check that the spark plug boot is securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.
!
Warning!
To reduce the risk of personal injury to the operator from blade or line contact and thrown objects, make sure your unit is equipped with the proper deflector, handle and harness for the type of cutting attachment being used (see chart in the chapter on "Approved
Combinations of Cutting Attachment,
Deflector, Handle and Harness").
As can be seen in that chart, some cutting attachments may require you to change your deflector, handle and/or harness.
Keep the deflector (and the attached skirt where appropriate) adjusted properly at all times (see chapters on
"Mounting the Deflector" and "Mounting the Cutting Attachments" of your instruction manual).
8 FS 90, FS 90 R
English / USA
.
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
Start the engine at least 10 feet
(3 meters) from the fueling spot, outdoors only.
For specific starting instructions, see the appropriate section of your manual.
Place the power tool on firm ground or other solid surface in an open area.
Maintain good balance and secure footing.
!
Warning!
To reduce the risk of injury from blade or line contact, be absolutely sure that the cutting attachment is clear of you and all other obstructions and objects, including the ground, because when the engine starts at starting-throttle, engine speed will be fast enough for the clutch to engage and move the cutting attachment.
Once the engine has started, immediately blip the throttle trigger, 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.
!
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.
FS 90, FS 90 R 9
English / USA
During Operation
Holding and controlling the power tool
Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles.
!
Warning!
Never attempt to operate your power tool with one hand. Loss of control of the power tool resulting in serious or fatal injury may result. To reduce the risk of cut injuries, keep hands and feet away from the cutting attachment. Never touch a moving cutting attachment with your hand or any other part of your body.
!
Warning!
Do not overreach. Keep proper footing and balance at all times. Special care must be taken in slippery conditions (wet ground, snow) and in difficult, overgrown terrain. Watch for hidden obstacles such as tree stumps, roots and ditches to avoid stumbling. For better footing, clear away scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.
!
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.
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.
!
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.
10 FS 90, FS 90 R
English / USA
!
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, shut off the engine immediately – move the slide control / 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.
FS 90, FS 90 R 11
English / USA
!
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.
12 FS 90, FS 90 R
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!
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.
!
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.
FS 90, FS 90 R 13
English / USA
USING THE CUTTING
ATTACHMENTS
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.
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).
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).
14 FS 90, FS 90 R
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STIHL PolyCut mowing head STIHL FixCut mowing head
Uses pre-cut lengths of nylon line.
Observe wear indicators.
Risk of Kickout (Blade Thrust) with All Rigid Cutting Blades
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.
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.
!
Warning!
Kickout (blade thrust) is the sudden and uncontrolled motion towards the operator's right or rear that can occur when the shaded area (especially the darkly shaded area) of a rotating blade comes in contact with a solid rigid object like a tree, rock, bush or wall. The rapid counterclockwise rotation of the blade may be stopped or slowed, and the cutting attachment may be thrown to the right or to the rear.
This kickout (blade thrust) may cause loss of control of the power tool and may result in serious or fatal injury to the operator or bystanders. To reduce the risk of injury, extreme caution should be used when cutting with the shaded area of any rigid blade.
FS 90, FS 90 R 15
English / USA
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.
Using the Brush Knife
When fitted to the power tool, the brush knife is suitable for applications ranging from cutting matted grass to clearing weeds, wild growth and scrub.
To cut wild growth and scrub, lower the rotating brush knife down onto the growth to achieve a chopping effect – but keep the tool below waist height at all times.
!
Warning!
Exercise extreme caution when using this method of cutting. The higher the cutting attachment is off the ground, the greater the risk of loss of control and of cuttings being thrown sideways.
Use the power tool like a scythe to cut grass, i.e. sweep it to and fro in an arc.
!
Warning!
When cutting woody materials, use the left side of the blade to avoid "kickout"
(blade thrust) situations.
!
Warning!
Improper use of a brush knife may cause it to crack, chip or shatter. Thrown blade fragments may seriously or fatally injure the operator or bystanders. To reduce the risk of injury, avoid contact with hard or solid foreign objects such as stones, rocks or pieces of metal.
!
Warning!
When cutting young saplings or other woody materials up to 2 cm (3/4") in diameter, use the left side of the blade to avoid "kickout" situations (see section on “Risk of kickout (blade thrust) with all rigid cutting blades”). Do not attempt to cut woody material with a larger diameter, since the blade may catch or jerk the power tool forward. This may cause damage to the blade or power tool or loss of control of the power tool, resulting in personal injury. Use a circular saw blade for such work.
!
Warning!
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 (when it has dulled noticeably).
16 FS 90, FS 90 R
English / USA
Using the Circular Saw Blade
Circular saw blades are suitable for thinning brush and cutting small trees up to a diameter of 4 cm (1 1/2”). Do not attempt to cut trees with larger diameters, since the blade may catch or jerk the trimmer/brushcutter forward.
This may cause damage to the blade or loss of control of the power tool and result in serious injury. Use a chain saw for such work.
!
Warning!
To reduce the risk that the blade will crack and/or break, avoid all contact with stones, rocks or the ground. Sharpen blades in a timely manner as specified – dull teeth may cause the blade to crack or shatter.
When a trimmer/brushcutter with a circular saw blade is used to cut down small trees, STIHL recommends that the standard deflector be removed and replaced by the special limit stop deflector (see chapter on “Mounting the
Deflector”). This limit stop helps to keep the unit positioned against the tree during the cutting process.
Inexperienced users should place the left side of the stop against the tree trunk before beginning to cut. This will keep the trimmer/brushcutter against the tree during the cutting operation and will reduce the risk of loss of control and possible kickout (described above and briefly again below).
Before starting the cut, accelerate the engine up to full throttle. Perform cut with uniform pressure. STIHL recommends that the circular saw blade be applied to the right of the tree, using the non-shaded area of the blade, as shown in the illustration above.
FS 90, FS 90 R 17
English / USA
!
Warning!
The risk of kickout is highest when cutting in the darker shaded area. To reduce the risk of kickout and resulting injury, do not use this area of the circular saw blade for cutting trees or shrubs.
Special techniques using the lighter shaded areas of the blade to cut shrubs and trees should only be used by experienced operators with specialized training in the use and control of the trimmer/brushcutter.
!
Warning!
To reduce the risk of loss of control and serious injury to the operator or bystanders by a kickout, never use a circular saw blade on a trimmer/ brushcutter with a loop handle, but rather only on one with a bicycle handle.
When felling small trees, maintain a distance of at least two tree lengths from the nearest coworker.
!
Warning!
In order to reduce the risk of injury from thrown objects or operator contact with the blade or head, be sure to remount the standard deflector when no longer using a circular saw blade.
MAINTENANCE, REPAIR AND
STORING
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny coverage.
!
Warning!
Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury.
Strictly follow the maintenance and repair instructions in the appropriate sections of your instruction manual.
!
Warning!
Always stop the engine and make sure that the cutting attachment is stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work not described in your instruction manual.
Have such work performed by your
STIHL servicing dealer only.
Wear gloves when handling or performing maintenance on blades.
!
Warning!
Use the specified spark plug, and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has 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.
18 FS 90, FS 90 R
English / USA
!
Warning!
Never repair damaged cutting attachments by welding, straightening or modifying the shape. This may cause parts of the cutting attachment to come off and result in serious or fatal injuries.
Keep blades sharp. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
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.
FS 90, FS 90 R 19
English / USA
Approved Combinations of Cutting Tool, Deflector, Handle and Harness
Cutting tools
1 STIHL Supercut 20-2
2 STIHL Autocut 25-2
3 STIHL Autocut C 25-2
4 STIHL Trimcut 30-2
5 STIHL Polycut 20-3
6 STIHL FixCut 25-2
7 Grass cutting blade 230-4
8 Grass cutting blade 230-8
9 Brush knife 250-3
10 Scratcher tooth circular saw blade 200
11 Chisel tooth circular saw blade 200
Handles
17 Loop handle
18 Loop handle with
19 Barrier bar
20 Bike handle
Harnesses
21 Shoulder strap may be used
22 Shoulder strap must be used
23 Full harnesss may be used
24 Full harness must be used
Grass cutting blades, brush knifes and circular saw blades made of any other non-metal material are not permitted.
Equipment
The complete unit includes:
– Cutting tool
– Deflector
– Handle
– Harness (bike handle unit only)
Deflectors, Limit Stop
12 Deflector for mowing heads only
13 Deflector with
14 Skirt and blade for all mowing heads
(see “Mounting the deflector”)
15 Deflector without skirt and blade for all metal mowing tools
16 Limit stop for circular saw blades
Select the correct combination from the table according to the cutting tool you intend to use. Read the table horizontally from left to right. Other combinations, e.g. reading the table diagonally, are not permitted.
!
Warning!
To reduce the risk of injury from thrown objects and blade contact, never operate your unit without the proper deflector for the cutting attachment being used. To reduce the risk of injury from loss of control and / or contact with the cutting tool, make sure your unit is equipped with a proper handle and harness for the type of cutting attachment being used.
!
Warning!
STIHL brushcutters with a loop handle without barrier bar may be used only with the above mentioned mowing head with nylon line or plastic blades. Other plastic or metal cutting tools, but not circular saw blades, may be used only on brushcutters with a bike handle or loop handle with barrier bar in order to reduce the risk of personal injury through contact with the cutting tool. To reduce the risk of serious injury to the operator or bystanders by kickout, never use a circular saw blade on a brushcutter with a loop handle. Circular saw blades may be used only on brushcutters with a bike handle.
20 FS 90, FS 90 R
Cutting tool
1
2
3
4
5
6
7
9
8
10
11
FS 90, FS 90 R
English / USA
15
16
Deflector, Limit Stop
12
Handle
17
18
14
20
13
18
20
20
19
19
Harness/Strap
22
21
22
23 23
24 24
21
English / USA
Approved Power Tool
Attachments
Mounting the Bike Handle
The following STIHL attachments may be mounted to the basic power tool:
FH
FCS
KB
HT
BF
KW
STIHL power tool attachments are available for converting the single purpose FS unit into other power tool combinations.
Attachment Application
BF
1)
Cultivator
FCS
2)3)
FH
1)
Scythe
HL 0°
2)
HL 135°
1)2)
Trimmer
(adjustable)
HT
2)
Pruner
KB (4601)
2)
Bristle Brush
KW (4601)
2)
PowerSweep
KW (4602)
2)
PowerSweep
1)
Barrier bar must be fitted on the loop handle
2)
Not approved for use with bikehandled units
3)
It is not necessary to use a shoulder strap
Removing Clamp Moldings
: Hold the lower clamp ( 1 ) and upper clamp ( 2 ) firmly.
: 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 ).
: Pull out the wing screw.
Washer ( 6 ) remain at the tommy screw .
: Separate the clamps.
Springs ( 4 ) and ( 5 ) remain in the lower clamp.
22 FS 90, FS 90 R
English / USA
A
7
1
Mounting the Handlebar
: Place the handlebar ( 7 ) in the lower clamp ( 1 ) so that distance A is no more than 6 in (15 cm).
: Place the upper clamp in position and hold both clamps together.
: Push the wing screw, with washer , through the two clamps as far as stop – hold all parts together and secure them.
8
: Place the secured assembly on the handle support ( 8 ) with the wing screw at the engine side.
: Push the wing screw into the handle support as far as stop and then screw it down – but do not finally tighten yet.
: Line up the handlebar at a right angle to the drive tube – check dimension A again.
: Tighten down the wing screw firmly
Mounting the Control Handle
: Loosen the screw ( 9 ). The nut ( 10 ) remains in the control handle ( 11 ).
: Push the control handle – throttle trigger ( 12 ) must point toward the gearbox – onto the handlebar ( 7 ) so that the holes ( 13 ) line up.
: Insert screw and tighten down firmly.
FS 90, FS 90 R 23
English / USA
Mounting the Loop Handle
15
15
14
14
15
2
1
1
Fitting the Throttle Cable
Do not kink the throttle cable or lay it in tight radii – make sure the throttle trigger moves freely.
: Press the throttle cable ( 14 ) into the retainers ( 15 ).
Throttle Cable Adjustment
: Go to chapter "Adjusting the
Throttle Cable".
Swiveling the Handlebar
Transport position:
: Release the wing screw ( 3 ) and unscrew it until the handlebar ( 7 ) can be turned clockwise.
: Turn the handlebar 90° and then swing the handles down.
: Tighten down the wing screw firmly.
Working position:
: Reverse the sequence described above to swing the handles up and turn the handlebar counterclockwise.
Loop Handle with Barrier Bar
: Insert square nuts ( 1 ) in the barrier bar ( 2 ).
: Line up the holes.
24 FS 90, FS 90 R
English / USA
4
2 8
7
4
8
7
A
9
3 4
10
5
5
3
6
7
6
1
1
: Place the clamp ( 3 ) in the loop handle ( 4 ) and position them both against the drive tube ( 5 ).
: Fit the clamp ( 6 ) and place the barrier bar ( 2 ) in position.
: Note correct position!
: Line up the holes.
: Insert screws ( 7 ) in holes and screw them into the barrier bar as far as stop.
: Go to “Securing the loop handle”.
Loop Handle without Barrier Bar
: Place the clamp ( 3 ) in the loop handle ( 4 ) and position them both against the drive tube ( 5 ).
: Fit the clamp ( 6 ) and line up the holes.
: Fit washers ( 7 ) on screws ( 8 ) and insert screws in holes. Screw on the square nuts ( 1 ) as far as stop.
: Go to “Securing the Loop Handle”.
Securing the Loop Handle
: Secure the loop handle ( 4 ) approx.
8 in (20 cm) ( A ) forward of the control handle ( 9 ).
: Line up the loop handle.
: Tighten down the screws firmly – lock the nuts if necessaey.
: The sleeve ( 10 ) is country-specific and must be located between the loop handle and control handle.
FS 90, FS 90 R 25
English / USA
Adjusting the Throttle Cable Fitting the Carrying Eye
Some machine versions are equipped with a throttle cable adjuster in the control handle.
A properly adjusted throttle cable is the precondition for correct operation in the full throttle, starting throttle and idle positions.
Adjust the throttle cable only after the unit is fully assembled – the control handle must be in the normal operating position.
2
STOP
1
: Press down the trigger interlock ( 1 ) and squeeze the throttle trigger ( 2 )
(full throttle) – this sets the throttle cable correctly.
: Use a suitable tool to push the slide to the bottom of the slot (see illustration).
1
1
2
: For position of carrying eye
1)
"Parts and Controls"
see
: Place the clamp (1) with the tapped hole on the left-hand side of the drive tube.
: Squeeze the two ends of the clamp together and hold in that position.
: Insert M 6 x 14 screw (2) .
: Line up the carrying eye.
: Tighten down the screw firmly.
26
1) Included as standard or available as special accessory
FS 90, FS 90 R
English / USA
Mounting the Deflector
1
4
7 7
6
4
3
1
2
5
7
3
Mounting the deflector
1 = Deflector approved for all cutting tools
2 = Deflector approved for use with mowing heads only
: Place the deflector on the gearhead.
: Fit the plate ( 3 ) and line it up.
: Insert M 5 x 18 screws and tighten down firmly.
Fitting skirt and blade
These parts must be fitted to the deflector ( 1 ) when you use a mowing head:
: Slide the lower guide slot of the skirt ( 4 ) onto the deflector ( 1 ) – it must snap into position.
: Push the blade ( 5 ) into the upper guide slot on the skirt and line it up with the first hole.
: Fit the screw and tighten it down firmly.
Mounting the stop
: Always fit stop (6) when you use a circular saw blade.
: Place the stop on the gearhead flange.
: Fit the three M 5 x 18 screws (7) and tighten down securely.
FS 90, FS 90 R 27
English / USA
Mounting the Cutting Tools
3
Mounting hardware is packed with the machine
Mowing heads and metal cutting tools may be mounted.
Preparations
: Lay your brushcutter on its back with the gearhead facing upward.
Mounting Hardware for Cutting Tools
The mounting hardware supplied depends on the cutting tool that comes as original equipment with the new brushcutter.
Mounting hardware is not packed with the machine
Only mowing heads may be mounted.
4
2
1
5
: Pull the hose ( 1 ) (protector for shipping) off the shaft ( 2 ).
: Go to "Mounting the Mowing Head".
If you want to mount a metal cutting tool in place of a mowing head, you will need the following additional parts: Nut ( 3 ), rider plate ( 4 ) and thrust washer ( 5 ) (special accessories).
Mounting hardware is loose
: Pull the hose ( 1 ) (protector for shipping) off the shaft ( 2 ).
The nut ( 3 ), rider plate ( 4 ) and thrust washer ( 5 ) are in the parts kit supplied with the machine.
: Go to "Mounting the Mowing Head" or "Mounting Metal Cutting Tools".
Mounting hardware is secured to gearhead
: Go to "Removing Mounting
Hardware"
28 FS 90, FS 90 R
English / USA
The rider plate ( 4 ) is in the parts kit supplied with the machine.
: Go to "Mounting the Mowing Head" or "Mounting Metal Cutting Tools".
Blocking the Output Shaft
2
1
8
7 7
Removing Mounting Hardware
: Block the shaft – see next section on "Blocking the Output Shaft".
: Use the combination wrench ( 6 )
(supplied with machine or available as special accessory) to unscrew the nut ( 3 ) clockwise (left-hand thread) from the shaft ( 2 ).
: Pull the thrust washer ( 5 ) off the shaft ( 2 ).
: Insert the stop pin or screwdriver ( 7 )
(supplied with machine or available as special accessories) in the hole
( 8 ) in the gearhead as far as stop – apply slight pressure.
: Rotate nut or cutting tool on the shaft ( 2 ) until the stop pin slips into position and blocks the shaft.
Mounting the Mowing Head
Keep instruction sheet for mowing head in a safe place.
: Screw the
STIHL SuperCut 20-2,
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
STIHL TrimCut 30-2,
STIHL PolyCut 20-3 counterclockwise onto the shaft ( 1 ) as far as stop.
: Block the output shaft.
: Tighten down the mowing head.
Remove the tool used to block the shaft.
FS 90, FS 90 R 29
English / USA
Removing the Mowing Head
: Block the output shaft.
STIHL SuperCut 20-2,
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
STIHL TrimCut 30-2,
STIHL PolyCut 20-3
: Unscrew the mowing head clockwise.
STIHL FixCut 25-2
: Use the combination wrench to unscrew the mounting nut clockwise from the output shaft
If the mounting nut is too loose, fit a new one
STIHL AutoCut
: Hold the rotating mowing head above the ground – tap it on the ground once – about 1 1/4" ( 3 cm) fresh line is advanced.
The blade on the deflector trims overlong line to the correct length – avoid tapping head more than once at a time.
Line feed operates only if both lines still have a minimum length of 1"
(2.5 cm) .
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 nylon line by hand.
STIHL FixCut 25-2
: Place the mowing head on the thrust plate ( 2 ).
Collar ( arrows ) must locate in the mowing head’s mounting hole
: Push the thrust washer ( 3 ) over the shaft ( 1 ) so that it locates against the base.
: Block the output shaft.
: Screw the mounting nut ( 4 ) with the combination wrench ( 5 ) counterclockwise on to the output shaft and tighten down firmly.
Remove the tool used to block the shaft.
Adjusting Nylon Line
STIHL SuperCut
Fresh line is advanced automatically if remaining line is still min. 2 1/2" (6 cm ) long. The blade on the deflector trims overlong line to the correct length.
Replacing Nylon Line or Cutting
Blades
Refer to the instructions supplied with the mowing head.
30 FS 90, FS 90 R
English / USA
Mounting Metal Cutting Tools
Remove the skirt and blade from the mowing head deflector before mounting grass cutting blade 230-4 (1) , grass cutting blade 230-8 (2) , or brush knife (3) – see “Mounting the Deflector”
Fit the appropriate limit stop before mounting the circular saw blade 200
(4,5) – see “Mounting the Deflector”.
: Lay your machine on its back with the gearhead facing upward.
Cutting edges of (1) and (3) may point in either direction.
Cutting edges of (2), (4) and (5) must point clockwise.
Direction of rotation is marked by arrow on inside of cutting head deflector or limit stop.
: Place the cutting tool (6) on the thrust plate (7) .
Collar (see arrows) must locate in cutting tool’s mounting hole.
: Slip thrust washer (8) and rider plate (9) over the output shaft (10) .
: Block the output shaft and
: Screw the mounting nut (11) with the combination wrench (12) onto the output shaft counterclockwise and tighten down firmly.
If the mounting nut is too loose, fit a new one.
Removing cutting tool
: Block the output shaft.
: Unscrew the nut clockwise.
: Removing the cutting tool – do not remove the thrust plate (7) .
FS 90, FS 90 R 31
English / USA
4-MIX Engine Fuel
The STIHL 4-MIX engine features gas oil lubrication and must be run on a fuel mixture of gasoline and engine oil.
It operates otherwise on the 4-stroke principle.
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 STlHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines
(e.g., outboard motors, snowmobiles, chainsaws, 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.
32 FS 90, FS 90 R
English / USA
Fueling
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.
1
2 1/2
5
US fl.oz
2.6
6.4
12.8
Dispose of empty mixing-oil canisters only at authorized disposal locations.
Opening the cap
: Raise the grip until it is upright.
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.
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 build-up in the tank to release slowly.
: Turn the cap counterclockwise
(approx. a quarter turn).
: Remove the filler cap.
FS 90, FS 90 R 33
English / USA
Closing the cap
Fitting the Harness
: Fit the cap – grip upright –marks must line up.
: Turn the cap clockwise as far as stop (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 engage the recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps.
The type and style of harness depend on the market.
Shoulder Strap
: Put on the shoulder strap ( 1 ).
: Adjust the length of the strap so that the spring hook ( 2 ) is about a hand’s width below your right hip.
: Balance the brushcutter.
The use of the harness is described in chapter “Approved Combinations of
Cutting Tool, Deflector, Handle and
Harness”.
Full harness
: Put on the full harness (1) .
: Adjust length until the spring hook
(2) is about a hand’s width below your right hip.
: Balance the brushcutter.
The use of the harness is described in chapter “Approved Combinations of
Cutting Tool, Deflector, Handle and
Harness”.
34 FS 90, FS 90 R
English / USA
Balancing the Brushcutter
A
B
The type and style of harness and carabiner (spring hook) depend on the market.
Attaching the Unit to the Shoulder
Strap
: Attach the spring hook ( 1 ) to the carrying ring ( 2 ) on the drive tube.
: Loosen the screw ( 3 ).
Balancing the Unit
The unit is balanced differently, depending on the cutting tool used.
Proceed as follows until the conditions specified under "Floating positions" have been met:
: Adjust the carrying ring – tighten the screw moderately – let the unit go until it is balanced – then check the floating position.
Floating positions
A Mowing tools
Mowing heads, grass cutting blades and brush knife should just touch the ground.
B Circular saw blades should "hover" about 8" (20 cm ) above the ground.
When the correct floating position has been reached:
: Tighten down the screw on the carrying ring.
FS 90, FS 90 R 35
English / USA
Starting / Stopping the Engine
STOP-
4
START
5 6
7
STOP
3
2
1
Detaching the Unit from the
Shoulder Strap
: Press the bar on the spring hook ( 1 ) and pull the carrying ring ( 2 ) out of the hook.
Controls
Control handle on bike handle
Throttle trigger interlock ( 1 )
Throttle trigger ( 2 )
Slide control ( 3 )
2
1
STOP
7
3
4
5
6
Control handle on drive tube
Throttle trigger interlock ( 1 )
Throttle trigger ( 2 )
Slide control ( 3 )
Positions of slide control
STOP O ( 4 ) – engine off – the ignition is switched off
# – normal run position ( 5 ) – the engine is running or can start
START ( 6 ) - the ignition is switched on, the engine can start
36 FS 90, FS 90 R
English / USA
Symbol on slide control h ( 7 ) – stop symbol and arrow – to stop the engine, push the slide control in direction of arrow on stop symbol ( h ) to
STOP O .
9
Starting
: Hold down the throttle trigger interlock and squeeze the throttle trigger.
: While holding both levers in this position
: move the slide control to START and hold it there.
: Now release the throttle trigger, slide control and trigger interlock in that order. This is the starting throttle position .
8
: Set the choke knob ( 8 ):
For cold start to g
For warm start to e even if engine has been running but is still cold
: Press fuel pump bulb ( 9 ) at least five times – even if the bulb is already filled with fuel.
: Place the unit on the ground: It must rest securely on the engine support and deflector.
Check that the cutting tool is not touching the ground or any other obstacles.
: Make sure you have a firm footing.
: Hold the unit with your left hand and press it down firmly – your thumb should be under the fan housing.
Do not stand or kneel on the drive tube!
FS 90, FS 90 R 37
English / USA
: Pull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull.
Do not pull out the starter rope to full length – it might otherwise break.
: Do not let the starter grip snap back.
Guide it slowly back into the housing so that the starter rope can rewind properly.
: Crank engine until it begins to fire.
After no more than five attempts , turn the choke knob to e
: continue cranking.
When the engine begins to fire:
: Blip the throttle trigger so that the slide control moves to the normal run position # and the engine settles down to idle speed.
Make sure the carburetor is correctly adjusted – the cutting tool must not rotate when the engine is idling.
Your machine is now ready for operation.
Stopping the engine
: Move the slide control in direction of arrow ( h ) to STOP O .
At very low outside temperatures
As soon as engine runs:
: Blip the throttle trigger to disengage the starting throttle position. The slide control moves to the normal run position # and the engine settles down to idle speed.
: Open the throttle slightly.
: Warm up engine for brief period.
If the engine does not start
Choke knob
If you did not turn the choke knob to e quickly enough after the engine began to fire, the combustion chamber has flooded.
: Turn choke knob to e
: Select starting throttle position.
: Start the engine by pulling the starter rope firmly. 10 to 20 pulls may be necessary.
If the engine still does not start:
10
: Move the slide control to STOP O .
: Pull off the spark plug boot ( 10 ).
38 FS 90, FS 90 R
Cleaning the Air Filter
English / USA
Motor Management
: Unscrew and dry off the spark plug.
: Open the throttle wide.
: Crank the engine several times with the starter to clear the combustion chamber.
: Refit the spark plug. Connect the spark plug boot (press it down firmly).
: Move the slide control to START .
: Set the choke knob to e – even if engine is cold.
: Now start the engine.
Throttle cable adjustment
: Check adjustment of throttle cable – see "Adjusting the Throttle Cable".
Tank run until dry
: After refueling, press the fuel pump bulb at least five times – even if bulb is filled with fuel.
: Set choke knob according to engine temperature.
: Now start the engine.
4
2
1
Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power:
: Set the choke knob to g .
: Take out the screw ( 1 ) and remove the filter cover ( 2 ).
: Clean away loose dirt from around the filter.
: Grip the filter element ( 3 ) at the notch (arrow) in the filter housing ( 4 ) and take it out.
: Fit a new filter element. As a temporary measure you can knock it out on the palm of your hand or blow it out. Do not wash.
: Replace any damaged parts.
: Install filter element in the filter housing.
: Refit the filter cover.
: Insert the screw and tighten it down firmly.
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 major hardware.
FS 90, FS 90 R 39
English / USA
Adjusting the Carburetor
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 adjust the engine idle speed within fine limits.
Standard Setting
: Shut off the engine.
: Mount cutting tool or attachment.
: Check the air filter – clean or replace if necessary.
: Check adjustment of the throttle cable and readjust if necessary – see "Adjusting the Throttle Cable".
: Check the spark arresting screen
(not installed in all countries) and clean or replace if necessary.
: Carefully screw both adjusting screws clockwise down onto their seats.
: Open high speed screw ( H )
3
/
4
turn.
: Open low speed screw ( L )
3
/
4
turn.
: Start and warm up the engine
: Adjust idle speed with the idle speed screw ( LA ) so that the tool does not rotate.
Fine Tuning
A slight correction of the setting of the high speed screw (H) may be necessary if engine power is not satisfactory when operating at high altitude or at sea level or after changing the tool.
Rule of thumb
: Turn high speed screw (H) about a quarter turn for every 1000m
(3300 ft) change in altitude.
: Carry out standard setting.
: Warm up engine for about 3 minutes.
: Open the throttle wide
40 FS 90, FS 90 R
English / USA
Spark Arresting Screen in
Muffler
At high altitude
: Turn high speed screw (H) clockwise (leaner) no further than stop until there is no noticeable increase in engine speed.
At sea level
: Turn high speed screw (H) counterclockwise (richer) no further than stop until there is no noticeable increase in engine speed.
It is possible that maximum engine speed may be reached with the standard setting in each case.
Adjusting Idle Speed
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L) .
: Warm up the engine for about
3 minutes.
Engine stops while idling
: Turn idle speed screw (LA) slowly clockwise until the engine runs smoothly – the tool must not rotate.
Cutting tool rotates when engine is idling
: Turn idle speed screw (LA) slowly counterclockwise until the tool stops rotating and then turn the screw about another
3
/
4
turn in the same direction.
1
/
2
to
Erratic idling behavior, engine stops even though setting of LA screw is correct, poor acceleration
Idle setting too lean:
: Turn low speed screw (L) counterclockwise (no further than stop) until the engine runs and accelerates smoothly.
Erratic idling behavior
Idle setting too rich:
: Turn low speed screw (L) clockwise
(no further than stop) until the engine runs and accelerates smoothly.
The spark arresting screen is an option that is not fitted in all machines.
: If the engine is low on power, check the spark arresting screen in the muffler.
: Wait for muffler to cool down.
: Move slide control to STOP-O .
: Remove the screw ( 1 ).
3
1
2
: Remove the screws ( 2 ).
: Lift away the shroud ( 3 ).
2
FS 90, FS 90 R 41
English / USA
Checking the Spark Plug
: Remove the screw ( 4 ).
: Lift spark arresting screen ( 5 ) and pull it out.
: Clean spark arresting screen if necessary – if screen is damaged or coked up, fit a new one.
: Refit the spark arresting screen.
: Insert screw and tighten down.
: Fit the shroud.
Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.
If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.
: Remove spark plug as described in chapter "Starting / Stopping the
Engine".
: Clean dirty spark plug.
: Check the electrode gap ( A ) and readjust if necessary – see
"Specifications".
: Use only resistor type spark plugs of the approved range.
Rectify problems which have caused fouling of spark plug:
: Too much oil in fuel mix.
: Dirty air filter.
: Unfavorable running conditions, e.g. operating at part load.
Fit a new spark plug after approx.
100 operating hours or earlier if the electrodes are badly eroded.
42 FS 90, FS 90 R
Lubricating the
Gearbox
English / USA
Replacing Starter Rope and Rewind Spring
1
2 2
1
1
1
To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot ( 2 ) snugly onto terminal ( 1 ) of the proper size.
(Note: If terminal has detachable
SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.
: Check grease level regularly - about every 25 hours of operation.
: Unscrew the filler plug (1) .
: If no grease can be seen on the inside of the filler plug, screw the tube (2) of STIHL gear lubricant for brushcutters - see “Special
Accessories” - into the filler hole.
: Squeeze up to 1/5 oz (5 g) grease into the gear housing.
Do not completely fill the gear housing with grease.
: Refit the filler plug and tighten it down firmly.
2
1
Replacing the starter rope
: Move slide control in direction of c – arrow to STOP-O .
: Take out the screws ( 1 ).
: Lift the starter cover ( 2 ) off the housing.
FS 90, FS 90 R 43
English / USA
4
3
5
: Remove the spring clip ( 3 ).
: Remove the rope rotor with washer ( 4 ) and pawl ( 5 ).
6
: Remove remaining rope from the rotor and grip.
: Tie a simple overhand knot in the new rope (see "Specifications") and then thread it through the top of the grip and the rope bushing ( 6 ).
: Thread the rope through the rotor and secure it with a simple overhand knot.
: Coat rope rotor bearing bore with non-resinous oil.
: Slip rotor over starter post – turn it back and forth to engage anchor loop of rewind spring.
44 FS 90, FS 90 R
English / USA
4
3
5
Replacing a broken rewind spring
: Remove the rope rotor as described under "Replacing Starter Rope and
Rewind Spring".
The bits of spring might still be under tension and could fly apart when you take them out of the housing. To reduce risk of injury , wear eye and face protection and work gloves.
: Remove spring housing and the parts of the spring.
: Lubricate the new spring with a few drops of non-resinous oil.
: Refit the pawl ( 5 ) in the rotor.
: Fit the washer ( 4 ) on the starter post.
: Use a screwdriver or suitable pliers to install spring clip ( 3 ) on starter post and engage it on the pawl's peg
– the spring clip must point counterclockwise clockwise as shown in the illustration.
: Go to "Tensioning the rewind spring".
: Place the new spring housing on the recesses (arrows) – bottom plate must face up.
: Push the spring housing into the starter cover.
: Install the rope rotor as described under "Tensioning the rewind spring".
: If the spring pops out of the housing during installation: Refit it in the counterclockwise direction, starting outside and working inward.
FS 90, FS 90 R 45
English / USA
Storing the Machine
Tensioning the rewind spring
: Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow.
: Hold the rotor steady – pull out and straighten the twisted rope.
: Release the rope rotor.
: Let go of rope slowly so that it winds onto the rotor. The starter grip must locate firmly in the rope guide bushing. If the grip droops to one side: Increase spring tension by adding one more turn.
: When the starter rope is fully extended it must still be possible to rotate the rotor another half turn. If this is not the case, the spring is overtensioned and could break.
Take one turn of rope off the rotor in such a case.
: Fit the starter cover on the housing.
: Tighten down the screws firmly.
For periods of about 3 months or longer
: Drain and clean the fuel tank in a well ventilated area.
: Dispose fuel properly in accordance with local environmental requirements.
: Run engine until carburetor is dry – this helps prevent carburetor diaphragms sticking together.
: Remove, clean and inspect the cutting tool.
: Thoroughly clean the machine – pay special attention to the cylinder fins and air filter.
: Store the machine in a dry, high or locked location – out of the reach of children and other unauthorized persons.
46 FS 90, FS 90 R
Sharpening
Metal Cutting Tools
: Use a file (special accessory) to sharpen cutting tools. In case of more serious wear or nicks:
Resharpen with a grinder or have work done by STIHL dealer.
: Resharpen frequently, take away as little material as possible – two or three strokes of the file are usually enough.
To avoid out-of-balance
: After resharpening about 5 times, have blade checked on STIHL balancer (special accessory) and rebalanced as necessary.
1
1
2
2
1
2
: Resharpen the cutters (1) uniformly
– do not alter the contour of the parent blade (2) in any way.
See cutting tool packaging for additional sharpening instructions.
English / USA
Inspections and
Maintenance by
Dealer
Fuel pickup body in tank
: Have the pickup body in the fuel tank replaced every year.
STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers.
FS 90, FS 90 R 47
English / USA
Maintenance Chart
The following maintenance operations apply to normal operating conditions.
If working conditions are difficult (very dusty work area, etc.) or your daily working time is longer than normal, shorten the specified intervals accordingly.
Complete machine
Control handle
Air filter
Pickup body in fuel tank
Fuel tank
Carburetor
Spark plug
Cooling inlets
Valve clearance
Combustion chamber
Spark arresting screen in muffler*
All accessible screws and nuts (not adjusting screws)
* see “Guide to Using this Manual”
1) STIHL recommends that this work be done by a
a STIHL servicing dealer
Visual inspection (condition, leaks)
Clean
Check operation
Clean
Replace
Have checked by servicing dealer 1)
Have replaced by servicing dealer 1)
Clean
Check idle speed
Readjust idle
Readjust electrode gap
Replace after 100 hours of operation
Inspect
Clean
Check and adjust if necessary after first
139 hours of operation 1)
Decarbonize after first 139 hours of operation, then after every 150 hours of operation
Inspect
Replace
Retighten
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X
X
X X
X
X
X
X
48 FS 90, FS 90 R
English / USA
The following maintenance operations apply to normal operating conditions.
If working conditions are difficult (very dusty work area, etc.) or your daily working time is longer than normal, shorten the specified intervals accordingly.
Antivibration elements
(rubber buffers, springs)
Metal cutting tools
Gearbox lubrication
Safety labels
Check
Replace
1)
Visual inspection
Replace
Sharpen
Check tightness
Check
Replenish
Replace
1) STIHL recommends that this work be done by a
a STIHL servicing dealer
X
X
X
X
X
X
X
X
X
X
X
X
X
X
FS 90, FS 90 R 49
English / USA
Parts and Controls
Part 1
50
1 Fuel Filler Cap
2 Carburetor Adjusting Screws
3 Starter Grip
4 Spark Plug Boot
5 Muffler
(with spark arresting screen*)
6 Bike Handle
7 Throttle Trigger
8 Slide Control
9 Throttle Trigger Interlock
10 Throttle Cable Retainer
11 Carrying Ring
12 Fuel Pump
13 Choke Knob
14 Air Filter Cover
15 Fuel Tank
16 Machine Support
17 Handle Support
18 Wing Screw
19 Loop Handle
20 Barrier Bar
# Serial number
* see "Guide to Using this Manual"
FS 90, FS 90 R
English / USA
Definitions
1. Fuel Filler Cap
For closing the fuel tank.
2. Carburetor Adjusting Screws
For tuning the carburetor.
3. Starter Grip
The grip of the pull starter, which is the device to start the engine.
4. Spark Plug Boot
Connects the spark plug to the ignition lead.
5. Muffler
(with spark arresting screen)
Reduces exhaust noises and diverts exhaust gases away from operator.
6. Bike Handle
For easy control of the machine with both hands during cutting work.
7. Throttle Trigger
Controls the speed of the engine.
8. Slide Control
For starting throttle, run and stop.
Keeps the throttle partially open during starting, switches the engine’s ignition off to stop the engine.
9. Throttle Trigger Interlock
Must be depressed before the throttle trigger can be activated.
10. Throttle Cable Retainer
Secures the throttle cable to the drive tube.
11. Carrying Ring
Connects the brushcutter to the harness.
12. Fuel Pump
Provides additional fuel feed for a cold start.
13. Choke Knob
Operates choke to enrich the mixture for easier engine starts.
14. Air Filter Cover
Encloses and protects the air filter.
15. Fuel Tank
For fuel and oil mixture.
16. Machine Support
For resting machine on the ground.
17. Handle Support
Connects the shaft and bike handle.
18. Wing Screw
Locks handlebar in selected position.
19. Loop Handle
For easy control of machine during operation.
20. Barrier Bar
Helps maintain clearance between cutting tool and feet and legs of operator.
FS 90, FS 90 R 51
English / USA
6
1
1
2
1 Mowing head
2 Deflector
(for mowing heads only)
3 Line limiting blade
4 Deflector with skirt
(for all cutting tools)
5 Skirt
6 Metal mowing tool
4
4
3
3
5
Definitions
1. Mowing head
The cutting attachment, i. e. mowing head, for different purposes
(special accessory).
2. Deflector
The deflector is designed to reduce the risk of injury from foreign objects flung backwards toward the operator by the cutting tool and from contact with the cutting tool.
3. Line limiting blade
Metal blade at the deflector in order to keep the line of the mowing head at the proper length.
4. Deflector with skirt
The deflector is designed to reduce the risk of injury from foreign objects flung backwards toward the operator by the cutting tool and from contact with the cutting tool. Is not designed to contain fragmented metal blades.
5. Skirt
The skirt at the bottom of the deflector must be adjusted as described in the chapters on mounting the various cutting tools.
6. Metal mowing tool
The cutting attachment, i. e. blade, made from metal for different purposes (special accessory).
7
8
7 Circular Saw Blade
8 Limit Stop (for circular saw blade only)
Definitions
7. Circular Saw Blade
Cutting tool made of metal for cutting wood.
8. Limit Stop
Is designed to position the brushcutter steady against the wood in order to reduce the risk of injury from loss of control from reactive forces such as thrust out.
52 FS 90, FS 90 R
Specifications
English / USA
Special Accessories
EPA / CEPA:
The Emission Compliance Period referred to on the Emissions
Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements.
Category:
A = 300 hours,
B = 125 hours,
C = 50 hours
CARB:
The Emission Compliance Period used on the CARB-Air Index Label indicates the terms:
Extended = 300 hours,
Intermediate = 125 hours,
Moderate = 50 hours
STIHL single cylinder four-stroke engine with gas-oil lubrication
Displacement: 1.73 cu.in (28.4 cm
3
)
Bore: 1.50 in (38 mm)
Stroke: 0.98 in (25 mm)
Engine power to ISO 8893:
1.3 bhp (0.95 KW)
Idle speed: 2,800 rpm
Engine cut-off speed: 10,500 rpm
Max. output shaft speed
(cutting tool drive): 7,500 rpm
Valve clearance
Inlet valve: 0.004 in (0.10 mm)
Exhaust valvel: 0.004 in (0.10 mm)
Fuel tank capacity
18.0 fl.oz (0.53 l)
Spark plug (resistor type)
Bosch USR 7AC
– Electrode gap 0.02 in (0.5 mm)
Starter rope
0.12 in (3.0 mm) dia.,
33.5 in (850 mm) long
Weight
(dry, without cutting tool and deflector)
FS 90 with bike handle:
12.8 lbs (5.8 kg)
FS 90 R with loop handle:
12.1 lbs (5.5 kg)
Contact your STIHL dealer for information regarding special accessories that may be available for your product.
FS 90, FS 90 R 53
English / USA
Maintenance and Repairs
Users of this unit should carry out only the maintenance operations described in this manual. Other repair work may be performed only by authorized STIHL service shops.
Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using original STIHL replacement parts.
Original STlHL parts can be identified by the STlHL part number, the STIHl logo and, in some cases, by the STlHL parts symbol ( . This symbol may appear alone on small parts.
54 FS 90, FS 90 R
English / USA
Not for California:
STIHL Incorporated Federal Emission Control Warranty
Statement
Your Warranty Rights and
Obligations
The U.S. Environmental Protection
Agency (EPA) and STIHL Incorporated are pleased to explain the Emission
Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser.
STIHL Incorporated must warrant the emission control system on your small off-road engine for the period of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road equipment engine.
Your emission control system includes parts such as the carburetor and the ignition system. Also included may be hoses, and connectors and other emission related assemblies.
Where a warrantable condition exists,
STIHL Incorporated will repair your small off-road equipment engine at no cost to you, including diagnosis (if the diagnostic work is performed at an authorized dealer), parts, and labor.
Manufacturer's Warranty
Coverage:
In the U.S., 1997 and later model year small off-road equipment engines are warranted for two years. If any emissionrelated part on your engine is defective, the part will be repaired or replaced by
STIHL Incorporated free of charge.
Owner's Warranty
Responsibilities:
As the small off-road equipment engine owner, you are responsible for the performance of the required maintenance listed in your owner's manual.
STIHL Incorporated recommends that you retain all receipts covering maintenance on your small off-road equipment engine, but STIHL
Incorporated cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.
Any replacement part or service that is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of the engine manufacturer.
As the small off-road equipment engine owner, you should be aware, however, that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road equipment engine to a
STIHL service center as soon as a problem exists. The warranty repairs will be completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-467-
8445 or you can write to
STIHL Inc.,
536 Viking Drive, P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine will be designed, built and equipped, at the time of sale, to meet all applicable regulations. STIHL
Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years.
Warranty Period
The warranty period will begin on the date the utility equipment engine is purchased by the initial purchaser and you have signed and sent back the warranty card to STIHL.
FS 90, FS 90 R 55
English / USA
If any emission related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner. Any warranted part which is not scheduled for replacement as required maintenance, or which is scheduled only for regular inspection to the effect of "repair or replace as necessary" will be warranted for the warranty period. Any warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that part.
Diagnosis
You, as the owner, shall not be charged for diagnostic labor which leads to the determination that a warranted part is defective. However, if you claim warranty for a component and the machine is tested as non-defective,
STIHL Incorporated will charge you for the cost of the emission test. Mechanical diagnostic work will be performed at an authorized STIHL servicing dealer.
Emission test may be performed either at STIHL Incorporated or at any independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized
STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective.
Any manufacturer-approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts and must be provided without charge to the owner. STIHL Incorporated is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
The following list specifically defines the emission-related warranted parts:
Carburetor
Choke (Cold start enrichment system)
Intake manifold
Air filter
Spark plug
Magneto or electronic ignition system
(ignition module)
Catalytic converter (if applicable)
Fasteners
Where to make a claim for
Warranty Service
Bring the product to any authorized
STIHL servicing dealer and present the signed warranty card.
Maintenance Requirements
The maintenance instructions in this manual are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction "Fuel").
Deviations from this recommendation regarding quality and mixing ratio of fuel and oil may require shorter maintenance intervals.
Limitations
This Emission Control Systems
Warranty shall not cover any of the following:
: repair or replacement required because of misuse, neglect or lack of required maintenance,
: repairs improperly performed or replacements not conforming to
STIHL Incorporated specifications that adversely affect performance and/or durability, and alterations or modifications not recommended or approved in writing by STIHL
Incorporated, and
: replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement point.
56 FS 90, FS 90 R
English / USA
For California only:
STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty
Statement
Your Warranty Rights and
Obligations
The California Air Resources Board
(CARB) and STIHL Incorporated are pleased to explain the emissions control system's warranty on your 2007 and later small off-road equipment engine.
In California, new equipment that uses small off-road-engines must be designed, built, and equipped to meet the State's stringent anti-smog standards. STIHL Incorporated must warrant the emissions control system on your small off-road engine for the period listed below provided there has been no abuse, neglect or improper maintenance of your small off-road engine.
Your emissions control system may include parts such as:
Air filter, Carburetor, Purger, Choke
(Cold Start Enrichment System), Control
Linkages, Intake Manifold, Magneto or
Electronic Ignition System (Ignition module), Spark Plug, Catalytic
Converter (if applicable), Fuel Tank, Fuel
Cap, Fuel Line, Fuel Line Fittings,
Clamps, Fasteners.
Where a warrantable condition exists,
STIHL Incorporated will repair your small off-road equipment engine at no cost to you including diagnosis, parts and labor.
Manufacturer’s Warranty
Coverage
:
This emissions control system is warranted for two years in California. If any emissions-related part on your equipment is defective, the part will be repaired or replaced by STIHL
Incorporated free of charge.
Owner’s Warranty
Responsabilities
:
As the small off-road equipment engine owner, you are responsible for performance of the required maintenance listed in your instruction manual. STIHL Incorporated recommends that you retain all receipts covering maintenance on your small offroad equipment engine, but STIHL
Incorporated cannot deny warranty solely for the lack of receipts or your failure to ensure the performance of all scheduled maintenance.
As the small off-road equipment engine owner, you should however be aware that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, or improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road equipment engine to a
STIHL servicing dealer as soon as the problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-467-
8445 or you can write to
STIHL Inc., 536 Viking Drive,
P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine is designed, built and equipped, at the time of sale, to meet all applicable emission regulations.
STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform to applicable emission regulations for a period of two years.
FS 90, FS 90 R 57
English / USA
Defects Warranty Period
The warranty periods will begin on the date the utility equipment engine is purchased by the initial purchaser. If any emission related part on your engine is defective, the part will be replaced by
STIHL Incorporated at no cost to the owner.
Add on or modified parts that are not exempted by CARB may not be used.
The use of any non exempted add on or modified parts will be grounds for disallowing a warranty claim. STIHL
Incorporated will not be liable to warrant failures of warranted parts caused by the use of a non exempted add on or modified part.
The warranty on emissions-related parts will be interpreted as follows:
1. Any warranted part that is not scheduled for replacement as required maintenance in the written instructions required in the Emission Warranty Parts
List (see below) must be warranted for the warranty period defined in
Subsection COVERAGE BY STIHL
INCORPORATED, see above. If any such part fails during the period of warranty coverage, it must be repaired or replaced by the manufacturer according to Subsection (4) below. Any such part repaired or replaced under the warranty must be warranted for the remaining warranty period.
2. Any warranted part that is scheduled only for regular inspection in the written instructions required by the
Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection
COVERAGE BY STIHL
INCORPORATED, see above. A statement in such written instructions to the effect of "repair or replace as necessary" will not reduce the period of warranty coverage. Any such part repaired or replaced under warranty must be warranted for the remaining warranty period.
3. Any warranted part that is scheduled for replacement as required maintenance in the written instructions required by the Emission Warranty Parts
List (see below) must be warranted for the period of time prior to the first scheduled replacement point for that part. If the part fails prior to the first scheduled replacement, the part must be repaired or replaced by the engine manufacturer according to Subsection
(4) below. Any such part repaired or replaced under warranty must be warranted for the remainder of the period prior to the first scheduled replacement point for the part.
4. Repair or replacement of any warranted part under the warranty must be performed at a warranty station at no charge to the owner.
5. Notwithstanding the provisions of
Subsection (4) above, warranty services or repairs will be provided at all manufacturer distribution centers that are authorized to service the subject engines.
6. The owner must not be charged for diagnostic labor that leads to the determination that a warranted part is in fact defective, provided that such diagnostic work is performed at a warranty station.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized
STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective. Any manufacturer approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission related parts and must be provided without charge to the owner.
STIHL Incorporated is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
58 FS 90, FS 90 R
English / USA
Trademarks
Emission Warranty Parts List
Air filter, Carburetor, Purger, Choke
(Cold Start Enrichment System), Control
Linkages, Intake Manifold, Magneto or
Electronic Ignition System (Ignition
Module), Spark Plug, Catalytic
Converter (if applicable), Fuel Tank, Fuel
Cap, Fuel Line, Fuel Line Fittings,
Clamps, Fasteners
Where to make a claim for
Warranty Service
Bring the STIHL product to any authorized STIHL servicing dealer and present the signed STIHL product registration card, or the print-out of the electronic product registration.
Limitations
The repair or replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL
Incorporated demonstrates that the
STIHL product has been abused, neglected, or improperly maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for repair or replacement of the part. That notwithstanding, any adjustment of a component that has a factory installed, and properly operating, adjustment limiting device is still eligible for warranty coverage.
STIHL Registered Trademarks
STIHL
® q
(
The color combination orange-grey
(U.S. Registrations #2,821,860;
#3,010,057; and #3,010,058)
4-MIX
®
AUTOCUT
®
EASYSTART
®
OILOMATIC
®
STIHL Cutquik
®
STIHL DUROMATIC
®
STIHL Farm Boss
®
STIHL Quickstop
®
STIHL ROLLOMATIC
®
STIHL WOOD BOSS
®
TIMBERSPORTS
®
YARD BOSS
®
Some of STIHL’s Common Law
Trademarks
BioPlus™
Easy2Start™
EasySpool™
ElastoStart™
Ematic™ / Stihl-E-Matic™
FixCut™
HT Plus™
IntelliCarb™
Master Control Lever™
Micro™
Pro Mark™
Quad Power™
Quiet Line™
STIHL Arctic™
STIHL Compact™
STIHL HomeScaper Series™
STIHL Interchangeable Attachment
Series™
FS 90, FS 90 R 59
English / USA
STIHL Magnum™ / Stihl-Magnum™
STIHL MiniBoss™
STIHL MotoPlus 4™
STIHL Multi-Cut HomeScaper Series™
Stihl Outfitters™
STIHL PICCO™
STIHL PolyCut™
STIHL PowerSweep™
STIHL Precision Series™
STIHL Protech™
STIHL RAPID™
STIHL SuperCut™
STIHL Territory™
TapAction™
TrimCut™
This listing of trademarks is subject to change.
Any unauthorized use of these trademarks without the express written consent of
ANDREAS STIHL AG & Co. KG,
Waiblingen is strictly prohibited.
60 FS 90, FS 90 R
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