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Stihl 85 Manual

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    40 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    Rule of thumb
    Turn high speed screw 
    (H) about 
    1/4  turn over for every 1000m 
    (3.300 ft) change in altitude.
    Conditions for adjustment
    Adjust the high speed screw  (H) 
    only if you are using a mowing head, 
    making sure the cutting lines are full 
    length (as far as the limiter blade on 
    the deflector).
    If you mount a metal cutting tool, 
    use the standard setting.
    : Carry out standard setting without 
    changing position of high speed 
    screw  (H).
    : Warm up engine for about 5 minutes 
    if you are using a metal cutting tool 
    or about 3 minutes if you are using a 
    mowing head.
    : Open the throttle wide. At high altitude
    :
    Turn high speed screw  (H) clock-
    wise (leaner) no further than stop 
    until there is no noticeable increase 
    in engine speed.
    At sea level
    : Turn high speed screw  (H) counter-
    clockwise (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.
    Engine stops while idling
    : Turn idle speed screw  (LA) slowly 
    clockwise until the engine runs 
    smoothly – the cutting tool must not 
    rotate. Cutting tool rotates when engine is 
    idling
    :
    Turn idle speed screw  (LA) slowly 
    counterclockwise until cutting tool 
    stops rotating and then turn the 
    screw about another 
    1/2 to 1 turn in 
    the same direction.
    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 (about 
    1/4 turn) 
    until the engine runs and 
    accelerates smoothly.
    Erratic idling behavior Idle setting too rich:
    : Turn low speed screw  (L) clockwise 
    (about 
    1/4  turn) until the engine runs 
    and accelerates smoothly. 
    						
    							
    41
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    If the engine is low on power, check the 
    spark arresting screen in the muffler.
    : Lift spark arresting screen and pull it 
    out sideways.
    : Clean spark arresting screen if 
    necessary.
    : If screen is damaged or coked up, fit 
    a new one.
    : Refit the spark arresting screen.
    * see “Guide to Using this Manual” 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 – see Starting / 
    Stopping the Engine.
    : Clean dirty spark plug.
    : Check 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.
    Spark Arresting Screen* in 
    Muffler
    392BA035 KN
    Checking the Spark Plug
    000BA002 KN 
    						
    							
    42 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    To reduce the risk of fire and burn 
    injury, use only spark plugs 
    authorized by STIHL. Always press 
    spark plug boot 
    (2) snugly onto 
    spark plug 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.
    Removing the Starter Cover
    :Take out the screws ( 1).
    : Lift the starter cover ( 2) away from 
    the tank ( 3) and pull it out from 
    under the shroud ( 4).
    000BA036 TR
    1
    Lubricating the 
    Gearbox
    1
    233BA010 KN
    2
    Replacing the Starter Rope 
    and Rewind Spring
    1
    11
    2
    3
    4
    392BA013 KN 
    						
    							
    43
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Removing the Rope Rotor
    :
    Take out the screw ( 5).
    : Remove the rope rotor very 
    carefully.
    The rewind spring is seated in the 
    rope rotor and may pop out and 
    uncoil if care is not taken. 
    The pieces of broken spring may be 
    under tension and fly apart 
    unexpectedly when you remove the 
    rope rotor. To help reduce the risk of 
    injury, wear face protection and 
    gloves.
    Replacing the Starter Rope
    :Use a screwdriver to pry the cap ( 6) 
    out of the starter grip.
    : Remove remaining rope from the 
    rotor and grip, making sure the 
    ElastoStart sleeve is not pushed out 
    of the grip.
    : Tie a simple overhand knot in the 
    end of the new starter rope (see 
    Specifications) and then thread the 
    rope through the top of the grip and 
    the rope bushing ( 7).
    : Refit the cap in the grip. :
    Pull the rope through the rotor and 
    secure it with a simple overhand 
    knot.
    : Go to Installing the rope rotor.
    Replacing a Broken Rewind 
    Spring
    Two types of replacement spring are 
    available from the factory:
    – A ready-to-fit rewind spring secured 
    with a wire retainer.
    – A rope rotor with pre-installed  rewind spring.
    Installing the ready-to-fit rewind 
    spring
    : Lubricate the spring with a few 
    drops of non-resinous oil – see 
    Special Accessories – do not open 
    the wire retainer!
    5
    392BA014 KN
    6
    7
    392BA015 KN
    392BA024 KN 
    						
    							
    44 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    :
    Carefully remove the parts of the old 
    spring from the starter cover and 
    rope rotor.
    : Insert the new rewind spring in the 
    rope rotor and, at the same time, 
    engage the outer spring loop in the 
    rotor’s recess – the wire retainer 
    slips off in this process. 
    If the spring pops out and uncoils, 
    refit it in the counterclockwise 
    direction, starting outside and 
    working inwards.
    : Go to Installing the Rope Rotor.
    Installing rope rotor with rewind 
    spring
    : Carefully unpack the new rope rotor 
    with rewind spring. The spring may 
    pop out if not handled with care –
    risk of injury.
    : Lubricate the spring with a few 
    drops of non-resinous oil – see 
    Special Accessories.
    : Go to Installing the Rope Rotor.
    Installing the Rope Rotor
    :Check dimension  a for inner spring 
    anchor loop and bend it slightly if 
    necessary.
    : Coat rope rotor bearing bore with 
    non-resinous oil – see Special 
    Accessories.
    : Slide the rotor onto the starter post – 
    turn it back and forth until the rewind 
    spring anchor loop ( 8) engages.
    : Insert the screw ( 5) and tighten it 
    down securely.
    : Go to Tensioning the Rewind 
    Spring.
    Tensioning the Rewind Spring
    :Make a loop in the unwound 
    starter rope and use it to turn 
    the rope rotor  six full revolutions 
    counterclockwise. Hold the rotor 
    steady – straighten the twisted rope 
    – release the rotor – 
    let go of rope slowly so that it winds 
    onto the rotor.
    : Check spring tension:
    – The starter grip must be firmly  seated in the rope guide bushing. 
    If the grip droops to one side: Add 
    one more turn on rope rotor to 
    increase spring tension.
    – When the starter rope is fully  extended it must 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.
    : Go to Fitting the Starter Cover.
    a
    389BA029 KN
    a = 2mm
    (0.08 in)
    8
    392BA025 KN
    392BA044 KN 
    						
    							
    45
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Fitting the Starter Cover
    :
    Push the upper mounting boss ( 2) 
    under the shroud ( 4) –
    line up the tank ( 3)and push the 
    lower part of cover onto the tank.
    : Insert and tighten down the housing 
    screws ( 1). 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. :
    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 1
    2
    3 4
    393BA045 KN
    Storing the Machine Sharpening 
    Metal Cutting Tools 
    						
    							
    46 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    :
    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.
    22
    1
    2
    11
    002BA042 KN 
    						
    							
    47
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    1) STIHL recommends that this work be done by a
       STIHL servicing dealer
    *  Not in all versions, market-specific
    Maintenance Chart
    Please note that the following maintenance intervals apply for normal operating 
    conditions. If your daily working time is longer than normal or cutting conditions 
    are difficult (very dusty work area etc.), shorten the specified intervals accordingly.
    before 
    starting work
    after finishing 
    work or daily
    after each
    refueling stop
    weekly
    monthly
    every 12 months
    if problem
    if damaged
    as required
    Complete machine Visual inspection (condition, leaks)
    XX
    Clean X
    Control handle Check operation XX
    Air filter Clean
    XX
    Replace X
    Pick up body in fuel tank Check
    X
    Replace XXX
    Fuel tank Clean XX
    Carburetor Check idle adjustment – the cutting 
    tool must not turn
    XX
    Readjust idle X
    Spark plug Readjust electrode gap
    X
    Replace after about 100 operating 
    hours
    Cooling inlets Inspect
    X
    Clean X
    Spark arresting screen* in muffler Check
    XX
    Replace XX
    All accessible screws and nuts 
    (not adjusting screws) Retighten
    X
    Anti-vibration element Check
    X
    Have replaced by servicing dealer
    1)X 
    						
    							
    48 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    Please note that the following maintenance intervals apply for normal operating 
    conditions. If your daily working time is longer than normal or cutting conditions 
    are difficult (very dusty work area etc.), shorten the specified intervals accordingly.
    before 
    starting work
    after finishing 
    work or daily
    after each
    refueling stop
    weekly
    monthly
    every 12 months
    if problem
    if damaged
    as required
    Cutting toolsInspect
    XX
    Replace X
    Check tightness  
    of cutting tool XX
    Metal cutting tools Sharpen XX
    Gearbox lubrication Check
    X
    Replenish X
    Safety labels Replace X 
    						
    							
    49
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
       1 Fuel pump
       2 Choke lever
       3 Carburetor adjusting screws
       4 Starter grip
       5 Fuel filler cap
       6 Fuel tank
       7 Muffler
    (with spark arresting screen*)
       8 Throttle trigger
       9 Slide control
    10 Throttle trigger interlock
    11 Bike handle
    12 Handle support
    13 Throttle cable retainer
    14 Clamp 
    (carrying ring for harness)
    15 Spark plug boot
    16 Air filter cover
    17 Machine support
    18 Barrier bar,
    not in all versions, market-specific
    19 Loop handle
    20 Drive tube
    # Serial number
    Parts and Controls
    Part 1
    10 #
    18 4
    12 13
    11
    8
    9
    10
    13 14 15
    16
    179 8
    19
    393BA043 KN
    1
    2
    3
    5 67
    20
    20
    14 
    						
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