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Stihl Fs 80 R Owners Manual

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    30 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    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 
    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.
    Replacing Nylon Line or Cutting 
    Refer to the instructions supplied with 
    the mowing head.
    Mounting Metal Cutting Tools
    Remove the  skirt and blade  from 
    the mowing head deflector before 
    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. 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    : 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). This engine is certified to operate on 
    unleaded gasoline and the STIHL two-
    stroke engine oil at a mix ratio of 50:1.
    Your engine requires a mixture of high-
    quality 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 (two-
    stroke 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 
    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 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    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.       
    Dispose of empty mixing-oil canisters 
    only at authorized disposal locations.
    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 
    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.
    After fueling, tighten fuel cap  as 
    securely as possible  by hand. Change the fuel pick up body every 
    Before storing your machine for a long 
    period, drain and clean the fuel tank and 
    run engine until carburetor is dry.
    Oil (STIHL 50:1 or 
    equivalent high-quality oils)
    US gal. US fl.oz 12.6
    2 1/2 6.4
    389BA031 KN389BA032 KN 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    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 
    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 
    Attaching Harness to Brushcutter
    : Attach the spring hook ( 1) to the 
    clamp ( 2) (carrying ring) on the drive 
    Fitting the HarnessBalancing the Brushcutter 
    34 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    Loosen the screw ( 3).
    Balancing the Machine
    The machine has to be balanced to suit 
    the cutting tool you are using.
    Carry out the following steps to reach 
    the condition described under “Point of 
    : Slide the clamp up or down the drive 
    tube. Tighten the screw moderately. 
    Let go of the machine and check to 
    see how it is balanced. Point of balance
    A Mowing tools
    Mowing heads, grass cutting blades 
    and brush knife should just touch 
    the ground.
    B Circular saw blades should hover about 8 in (20 cm) 
    above the ground.
    When the correct point of balance is 
    : Tighten down the clamp screw 
    Disconnecting Brushcutter from 
    Depending on the type of spring hook 
    :Press down the bar on the spring 
    hook ( 1) and take the clamp (2) off 
    the hook.
    002BA034 KN
    002BA035 KN 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    Control handle on bike handle
    Throttle trigger interlock (
    Throttle trigger ( 2) 
    Slide control ( 3) Control handle on drive tube
    Throttle trigger interlock (
    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 Symbol on slide control
      ( 7 ) – stop symbol and arrow – to stop 
    the engine, push the slide control in 
    direction of arrow on stop symbol ( h ) to 
    STOP -O .
    : Hold down the throttle trigger 
    interlock and squeeze the throttle 
    : 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 .
    Starting / Stopping 
    the Engine
    002BA182 KN
    002BA181 KN
    36 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    Set the choke knob ( 8):
    For cold start to      
    For warm start to     e 
    – also use this position 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 
    : 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! :
    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 
    : Continue cranking until engine runs.
    393BA017 KN
    393BA018 KN
    002BA038 KN
    002BA040 KN357BA033 KN 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    When the engine begins to fire:
    : Turn choke knob to  e
    and continue cranking.
    When the engine begins to fire:
    : Blip the throttle trigger immediately 
    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 
    Your machine is now ready for 
    Stopping the engine
    : Push the slide control in direction 
    of arrow on stop symbol ( 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 
    : 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:
    : Move the slide control to  STOP-O .
    : Pull off the spark plug boot ( 10). :
    Unscrew and dry off the spark plug.
    : Open the throttle wide.
    : Crank the engine several times with 
    the starter to clear the combustion 
    : Refit the spark plug. Connect the 
    spark plug boot (press it down 
    : 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 chapter on 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 
    : Now start the engine.
    393BA042 KN 
    38 English / USAFS 80, FS 80 R, FS 85, FS 85 R
    During break-in period
    A factory new machine should not be run 
    at high revs (full throttle off load) for the 
    first three tank fillings. This avoids 
    unnecessary high loads during the 
    break-in period. As all moving parts 
    have to bed in during the break-in 
    period, the frictional resistances in the 
    engine are greater during this period. 
    The engine develops its maximum 
    power after about 5 to 15 tank fillings.
    During operation
    After a long period of full-throttle 
    operation, allow engine to run for a while 
    at idle speed so that the heat in the 
    engine can be dissipated by flow of 
    cooling air. This protects engine-
    mounted components (ignition, 
    carburetor) from thermal overload.
    After finishing work
    Wait for engine to cool down. Drain the 
    fuel tank. Store the machine in a dry 
    place. Check tightness of nuts and 
    screws (not adjusting screws) at regular 
    intervals and retighten as necessary.
    Dirty air filters reduce engine power 
    increase fuel consumption and make 
    starting more difficult.
    If there is a noticeable loss of engine 
    Move choke lever to  g.
    : Press in the tab  ( 1 ).
    : Ease the filter cover ( 2) over the tab 
    and take it away.
    : Clean away loose dirt from around 
    the filter.
    : Remove the foam and felt filter 
    elements. :
    Wash the foam element in a clean, 
    non-flammable cleaning solution 
    (e.g. warm soapy water) and then 
    : Fit new felt element. 
    As a temporary measure you can 
    knock it out on the palm of your 
    hand or blow it out with compressed 
    air. Do not  wash.
    Replace damaged parts!
    : Install the foam element ( 3) in the 
    filter cover ( 2).
    : Place felt element ( 4) (lettering 
    facing inward) in filter housing ( 5).
    : Fit filter cover so that it snaps into 
    Operating Instructions Cleaning the Air Filter
    355BA014 KN
    3355BA031 KN
    355BA032 KN 
    FS 80, FS 80 R, FS 85, FS 85 R English / USA
    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.
    The carburetor comes from the factory 
    with a standard setting.
    This setting provides an optimum fuel-air 
    mixture under most operating 
    With this carburetor it is only possible to 
    adjust the engine idle speed within fine 
    Standard Setting
    :Shut off the engine.
    : Mount FS cutting tool,  Power Tool 
    Attachment or CombiTool.
    : Check the air filter and replace if 
    : Check adjustment of throttle cable –
    adjust if necessary – see Adjusting 
    the Throttle Cable.
    : Turn high speed screw  (H) 
    counterclockwise  (max. 
    3/4 turn) as 
    far as stop.
    : Carefully screw the low speed 
    screw  (L) down onto its seat. Then 
    open it  one turn counterclockwise.
    : Start and warm up the engine.
    : Adjust idle speed with the idle speed 
    screw  (LA) so that the cutting 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 cutting tool.
    Motor Management Adjusting the Carburetor
    265BA024 KN
    HL 1
    3 / 4 
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