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Stihl Km 90 R Owners Manual

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    STIHL KM 90 R
    Read Instruction Manual thoroughly 
    before use and follow all safety 
    precautions – improper use can 
    cause serious or fatal injury.
    Antes de usar la máquina lea y siga 
    todas las precauciones de 
    seguridad dadas en el manual de 
    instrucciones – el uso incorrecto 
    puede causar lesiones graves o 
    Instruction Manual
    Manual de instrucciones 
    							Instruction Manual
    1 - 30
    Manual de instrucciones
    31 - 63 
    							Original Instruction Manual Printed on chlorine-free paper
    Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2015
    0458-465-8621-C. VA8.E15. 
    KM 90 R
    {This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process 
    with electronic systems.
    Allow only persons who fully understand 
    the manuals of the KombiEngine and the 
    KombiTool to operate this power tool 
    To receive maximum performance and 
    satisfaction from your STIHL power tool, 
    it is important that you read, understand 
    and follow the safety precautions and 
    the operating and maintenance 
    instructions in chapter "Safety 
    Precautions and Working Techniques" 
    before using your power tool. For further 
    information you can go to 
    Contact your STIHL dealer or the STIHL 
    distributor for your area if you do not 
    understand any of the instructions in the 
    two manuals.
    Because this KombiEngine is the engine 
    for a high-speed power 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. KombiSystem 2
    Guide to Using this Manual 2
    Safety Precautions and Working 
    Techniques 3
    Approved KombiTools 10
    Mounting the Loop Handle 11
    Adjusting the Throttle Cable 12
    Fuel 12
    Fueling 13
    Starting / Stopping the Engine 14
    Operating Instructions 16
    Cleaning the Air Filter 16
    Engine Management 16
    Adjusting the Carburetor 17
    Spark Arresting Screen in Muffler 17
    Spark Plug 18
    Storing the Machine 19
    Inspections and Maintenance by 
    Dealer 19
    Maintenance and Care 20
    Main Parts 22
    Specifications 23
    Maintenance and Repairs 24
    Disposal 24
    STIHL Incorporated Federal 
    Emission Control Warranty 
    Statement 25
    STIHL Incorporated California 
    Exhaust and Evaporative 
    Emissions Control Warranty 
    Statement 27
    Trademarks 29 
    							KM 90 R
    2 In the STIHL KombiSystem a number of 
    different KombiEngines and KombiTools 
    can be combined to produce a power 
    tool. In this instruction manual the 
    functional unit formed by the 
    KombiEngine and KombiTool is referred 
    to as the power tool.
    Therefore, the separate instruction 
    manuals for the KombiEngine and 
    KombiTool should be used together for 
    the power tool.
    Always read and and make sure you 
    understand both instruction manuals 
    before using your power tool for the first 
    time and keep them in a safe place for 
    future reference.
    The meanings of the pictograms 
    attached to or embossed on the 
    machine are explained in this manual.
    Depending on the model concerned, the 
    following pictograms may be on your 
    Symbols in Text
    Many operating and safety instructions 
    are supported by illustrations.
    The individual steps or procedures 
    described in the manual may be marked 
    in different ways:
    NA bullet marks a step or procedure.
    A description of a step or procedure that 
    refers directly to an illustration may 
    contain item numbers that appear in the 
    illustration. Example:
    NLoosen the screw (1).
    NLever (2) ...
    In addition to the operating instructions, 
    this manual may contain paragraphs 
    that require your special attention. Such 
    paragraphs are marked with the 
    symbols and signal words described 
    Indicates an imminent risk of severe or 
    fatal injury.
    Indicates a hazardous situation which, if 
    not avoided, could result in severe or 
    fatal injury.
    Indicates a risk of property damage, 
    including damage to the machine or its 
    individual components.
    002BA530 KN
    pression valve
    Manual fuel pump
    Press to operate manual 
    fuel pump
    Filler hole for gear 
    Air intake summer mode
    Air intake winter mode
    Handle heating 
    							KM 90 R
    Engineering Improvements
    STIHL’s philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improvements 
    are made from time to time. Therefore, 
    some changes, modifications and 
    improvements may not be covered in 
    this manual. If the operating 
    characteristics or the appearance of 
    your machine differs from those 
    described in this manual, please contact 
    your STIHL dealer or the STIHL 
    distributor for your area for assistance.
    Have your STIHL dealer show you how 
    to operate your power tool. Observe all 
    applicable local safety regulations, 
    standards and ordinances.
    Do not lend or rent your power tool 
    without the instruction manuals. Be sure 
    that anyone using it understands the 
    information contained in these manuals.
    Use your power tool only for the 
    applications described in the instruction 
    manual of the KombiTool you are using.
    Do not use it for other purposes, since 
    misuse may result in personal injury or 
    property damage, including damage to 
    the machine.
    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.
    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 
    power tools. Different models may have 
    different parts and controls. See the 
    appropriate section of your 
    KombiEngine and KombiTool instruction 
    manuals for a description of the controls 
    and the function of the parts of your 
    Do not clean your machine with a 
    pressure washer. The solid jet of water 
    may damage parts of the machine.
    Safe use of a KombiEngine involves
    1.the operator
    2.the power tool
    3.the use of the power tool
    Safety Precautions and 
    Working Techniques
    Because this KombiEn-
    gine is the engine for a 
    high-speed power tool, 
    special safety precau-
    tions must be observed to 
    reduce the risk of per-
    sonal injury.
    It is important that you 
    read, fully understand 
    and observe the following 
    safety precautions and 
    warnings. Read the 
    instruction manuals and 
    the safety precautions of 
    your KombiEngine and 
    KombiTool periodically. 
    Careless or improper use 
    may cause serious or 
    fatal injury. 
    							KM 90 R
    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.
    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.
    Prolonged use of a power tool (or other 
    machines) exposing the operator to 
    vibrations may produce whitefinger 
    disease (Raynaud's phenomenon) or 
    carpal tunnel syndrome.
    These conditions reduce the hand's 
    ability to feel and regulate temperature, 
    produce numbness and burning 
    sensations and may cause nerve and 
    circulation damage and tissue necrosis.
    All factors which contribute to 
    whitefinger disease are not known, but 
    cold weather, smoking and diseases or 
    physical conditions that affect blood 
    vessels and blood transport, as well as 
    high vibration levels and long periods of exposure to vibration are mentioned as 
    factors in the development of whitefinger 
    disease. In order to reduce the risk of 
    whitefinger disease and carpal tunnel 
    syndrome, please note the following:
    –Most STIHL power tools are 
    available with an anti-vibration 
    ("AV") system designed to reduce 
    the transmission of vibrations 
    created by the machine to the 
    operator's hands. An AV system is 
    recommended for those persons 
    using power tools on a regular or 
    sustained basis.
    –Wear gloves – not while using 
    KombiTool BG-KM – and keep your 
    hands warm.
    –Keep the AV system well 
    maintained. A power tool with loose 
    components or with damaged or 
    worn AV elements will tend to have 
    higher vibration levels.
    –Maintain a firm grip at all times, but 
    do not squeeze the handles with 
    constant, excessive pressure. Take 
    frequent breaks.
    All the above-mentioned precautions do 
    not guarantee that you will not sustain 
    whitefinger disease or carpal tunnel 
    syndrome. Therefore, continual and 
    regular users should closely monitor the 
    condition of their hands and fingers. If 
    any of the above symptoms appear, 
    seek medical advice immediately.
    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
    To reduce the risk of injury, the operator 
    should wear proper protective apparel.
    Be particularly alert and cautious when 
    wearing hearing protection because 
    your ability to hear warnings (shouts, 
    alarms, etc.) is restricted.
    For further instructions on proper 
    clothing see the safety precautions in 
    the instruction manual of the KombiTool 
    you are using.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 
    Avoid loose-fitting jack-
    ets, scarfs, neckties, 
    jewelry, flared or cuffed 
    pants, unconfined long 
    hair or anything that 
    could become caught on 
    branches, brush or the 
    moving parts of the unit. 
    Secure hair so it is above 
    shoulder level. 
    							KM 90 R
    For illustrations and definitions of the 
    power tool parts see the chapter on 
    "Main Parts."
    Never modify this power tool in any way. 
    Only attachments supplied by STIHL or 
    expressly approved by STIHL for use 
    with the specific STIHL KombiEngine 
    model are authorized. Although certain 
    unauthorized attachments are useable 
    with STIHL power tools, their use may, 
    in fact, be extremely dangerous.
    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.
    Transporting the Power Tool
    Always switch off the engine and make 
    sure the working tool has stopped before 
    putting a power tool down. When 
    transporting your power tool in a vehicle, 
    properly secure it to prevent turnover, 
    fuel spillage and damage to the power 
    Your STIHL power tool uses an oil- 
    gasoline mixture for fuel (see the 
    chapter on "Fuel" of your instruction 
    Fueling Instructions
    To reduce the risk of serious injury from 
    burns, never attempt to refuel the unit 
    until it has been completely removed 
    from the operator.
    Fuel your power tool in well-ventilated 
    areas, outdoors. Always shut off the 
    engine and allow it to cool before 
    refueling. Gasoline vapor pressure may 
    build up inside the fuel tank depending 
    on the fuel used, the weather conditions 
    and the tank venting system.In order to reduce the risk of burns and 
    other personal injury from escaping gas 
    vapor and fumes, remove the fuel filler 
    cap on your power tool carefully so as to 
    allow any pressure build-up in the tank 
    t o  r e l e a s e  s l o w l y .  N e v e r  r e m o v e  t h e  f u e l  
    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 
    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. Gasoline is an extremely 
    flammable fuel. If spilled 
    and ignited by a spark or 
    other ignition source, it 
    can cause fire and seri-
    ous burn injury or 
    property damage. Use 
    extreme caution when 
    handling gasoline or fuel 
    mix. Do not smoke or 
    bring any fire or flame 
    near the fuel or the power 
    tool. Note that combusti-
    ble fuel vapor may 
    escape from the fuel 
    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 
    							KM 90 R
    See also the "Fueling" chapter in your 
    Instruction Manual for additional 
    Before Starting
    Always check your power tool for proper 
    condition and operation before starting, 
    particularly the throttle trigger, throttle 
    trigger lockout, 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.
    Check fuel system for leaks, especially 
    the visible parts, e.g., filler cap, hose 
    connections, manual fuel pump (only for 
    power tools equipped with a manual fuel 
    pump). Do not start the engine if there 
    are leaks or damage – risk of fire! Have 
    the machine repaired by a servicing 
    dealer before using it.
    Never operate your power tool if it is 
    damaged, improperly adjusted or 
    maintained, or not completely or 
    securely assembled.
    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 
    Keep the handles clean and dry at all 
    times; it is particularly important to keep 
    them free of moisture, pitch, oil, fuel mix, 
    grease or resin in order for you to 
    maintain a firm grip and properly control 
    your power tool.
    Start the engine at least 10 feet (3 m) 
    from the fueling spot, outdoors only.
    For specific starting instructions, see the 
    appropriate section of your 
    KombiEngine and KombiTool manuals. 
    Place the power tool on firm ground or 
    other solid surface in an open area. 
    Maintain good balance and secure 
    To reduce the risk of injury from loss of 
    control, be absolutely sure that the 
    working tool 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 working tool.Once the engine has started, 
    immediately blip the throttle trigger, 
    which should release the starting throttle 
    and allow the engine to slow down to 
    Your power tool is a one-person 
    machine. Do not allow other persons in 
    the general work area, even when 
    To reduce the risk of injury from loss of 
    control, do not attempt to "drop start" 
    your power tool.
    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 
    See also the safety precautions on 
    Starting in the instruction manual of the 
    Important Adjustments
    To reduce the risk of personal injury 
    from loss of control or contact with the 
    running working tool, do not use a power 
    tool with incorrect idle adjustment. At 
    correct idle speed, the working tool  Unit vibrations can cause 
    an improperly tightened 
    fuel filler cap to loosen or 
    come off and spill quanti-
    ties of fuel. In order to 
    reduce the risk of fuel 
    spillage and fire, tighten 
    the fuel filler cap by hand 
    as securely as possible. 
    							KM 90 R
    7 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.
    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.
    Your right hand should grip the rear 
    handle. This also applies to left-handers.
    To reduce the risk of injury from loss of 
    control, never work on a ladder or on any 
    other insecure support.
    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.
    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 
    Operating Instructions
    Do not operate your power tool using the 
    starting throttle lock, as you do not have 
    control of the engine speed.
    In the event of an emergency, switch off 
    the engine immediately – move the slide 
    control / stop switch to 0 or STOP.
    Never modify your muffler. Any 
    modification could cause an increase in 
    heat radiation, sparks or sound level, 
    thereby increasing the risk of fire, burn 
    injury or hearing loss. You may also 
    permanently damage the engine. Have 
    your muffler serviced and repaired by 
    your STIHL servicing dealer only.
    The muffler and other parts of the engine 
    (e.g. fins of the cylinder, spark plug) 
    become hot during operation and remain 
    hot for a while after stopping the engine. 
    To reduce risk of burns, do not touch the 
    muffler and other parts while they are 
    hot. Keep the area around the muffler 
    clean. Remove excess lubricant and all 
    debris such as pine needles, branches 
    or leaves. Let the engine cool down 
    002BA057 KN
    erates toxic exhaust 
    fumes containing chemi-
    cals, such as unburned 
    hydrocarbons (including 
    benzene) and carbon 
    monoxide, that are 
    known to cause respira-
    tory problems, cancer, 
    birth defects, or other 
    reproductive harm. Some 
    of the gases (e.g. carbon 
    monoxide) may be color-
    less and odorless. To 
    reduce the risk of serious 
    or fatal injury/illness from 
    inhaling toxic fumes, 
    never run the machine 
    indoors or in poorly venti-
    lated locations. 
    							KM 90 R
    8 sitting on concrete, metal, bare ground 
    or solid wood away from any 
    combustible substances.
    An improperly mounted or damaged 
    cylinder housing or a 
    damaged/deformed muffler shell may 
    interfere with the cooling process of the 
    muffler. To reduce the risk of fire or burn 
    injury, do not continue work with a 
    damaged or improperly mounted 
    cylinder housing or a 
    damaged/deformed muffler shell.
    Your muffler is furnished with a spark 
    arresting screen designed to reduce the 
    risk of fire from the emission of hot 
    particles. Never operate your unit with a 
    missing or damaged spark arresting 
    screen. If your gas/oil mix ratio is correct 
    (i.e., not too rich), this screen will 
    normally stay clean as a result of the 
    heat from the muffler and need no 
    service or maintenance. If you 
    experience loss of performance and you 
    suspect a clogged screen, have your 
    muffler maintained by a STIHL servicing 
    dealer. Some state or federal laws or 
    regulations may require a properly 
    maintained spark arrestor for certain 
    uses. See the "Maintenance, Repair and 
    Storing" section of these Safety 
    Precautions. Remember that the risk of 
    a brush or forest fire is greater in hot or 
    dry conditions.
    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 
    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 
    section of your KombiEngine and 
    KombiTool instruction manuals. Please 
    refer to the maintenance charts 
    respectively the maintenance notes in 
    these manuals.
    Always stop the engine and make sure 
    that the working tool 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 KombiEngine and 
    KombiTool instruction manuals. Have 
    such work performed by your STIHL 
    servicing dealer only.
    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 attached.) A loose 
    connection between spark plug boot and 
    the ignition wire connector in the boot 
    may create arcing that could ignite 
    combustible fumes and cause a fire. Some STIHL power tools 
    are equipped with a cata-
    lytic 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 con-
    ventional mufflers when 
    the engine returns to idle 
    or is shut off. To reduce 
    the risk of fire and burn 
    injuries when using a cat-
    alytic converter, 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 materi-
    als while it is still hot.
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