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Stihl Fs 55 R Instruction Manual

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    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    29 Starting
    NPlace the unit on the ground: It must 
    rest securely on the engine support 
    and the deflector. Check that the 
    cutting attachment is not touching 
    the ground or any other obstacles.
    NMake sure you have a safe and 
    secure footing.
    NHold the unit with your left hand and 
    press it down firmly – your thumb 
    should be under the fan housing.NHold the starter grip with your right 
    hand.
    Version without Easy2Start
    NPull the starter grip slowly until you 
    feel it engage and then give it a brisk 
    strong pull.
    Version with Easy2Start
    NPull the starter grip slowly until you 
    feel it engage and then pull it out 
    slowly and steadily.Both versions
    NDo not let the starter grip snap back. 
    Guide it slowly back into the housing 
    so that the starter rope can rewind 
    properly.
    NContinue cranking.
    When the engine begins to fire:
    NAfter no more than five pulls, move 
    the choke lever (8) to e.
    NContinue cranking.
    As soon as the engine runs
    Version with bike handle
    NBlip the throttle trigger – the engine 
    settles down to idle speed.
    Version with loop handle
    NSqueeze the throttle trigger to 
    disengage the tongue – the engine 
    will settle down to idle speed.
    Your machine is now ready for 
    operation.
    Do not stand or kneel on the drive 
    tube.
    233BA020 KN
    233BA014 KN
    Do not pull out the starter rope all 
    the way – it might otherwise 
    break.
    Do not pull out the starter rope all 
    the way – it might otherwise 
    break.
    232BA014 KN
    Make sure the carburetor is 
    correctly adjusted. The cutting 
    attachment must not rotate when 
    the engine is idling.
    8
    232TI015 KN 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    30
    Stopping the engine
    NMove the slide control in direction of 
    the arrow (h) to STOP-0 or the stop 
    switch to STOP / 0.
    If the engine does not start
    Choke lever
    If you did not move the choke lever to e 
    quickly enough after the engine began to 
    fire, the combustion chamber is flooded.
    NSet the choke lever to 
     e.
    NSet the slide control, trigger lockout 
    lever and throttle trigger to the 
    starting throttle position.
    NStart the engine by pulling the 
    starter rope briskly – 10 to 20 pulls 
    may be necessary. 
    If the engine still does not start
    NMove the slide control or stop switch 
    toSTOP / 0.
    NRemove the spark plug – see 
    Spark Plug.
    NDry the spark plug.
    NCrank the engine several times with 
    the starter to clear the combustion 
    chamber.
    NRefit the spark plug – see Spark 
    Plug.
    NMove the slide control or stop switch 
    to F/I. 
    NSet the choke lever to e – even if 
    the engine is cold.
    NNow start the engine.Fuel tank run until completely dry
    NAfter refueling, press the fuel pump 
    bulb at least five times – even if the 
    bulb is filled with fuel.
    NSet the choke lever to suit the 
    engine temperature.
    NStart the engine.
    During break-in period
    A factory-new machine should not be 
    run at high revs (full throttle off load) for 
    the first three tank fillings. This avoids 
    unnecessary high loads during the 
    break-in period. As all moving parts 
    have to bed in during the break-in 
    period, the frictional resistances in the 
    engine are greater during this period. 
    The engine develops its maximum 
    power after about 5 to 15 tank fillings.
    During Operation
    After a long period of full throttle 
    operation, allow the engine to run for a 
    short while at idle speed so that engine 
    heat can be dissipated by the flow of 
    cooling air. This protects engine-
    mounted components (ignition, 
    carburetor) from thermal overload.
    After Finishing Work
    Storing for a short period: Wait for the 
    engine to cool down. Empty the fuel tank 
    and keep the machine in a dry place, 
    well away from sources of ignition, until 
    you need it again. For longer out-of-
    service perionds – see Storing the 
    Machine.
    Operating Instructions 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    31 If there is a noticeable loss of engine 
    power
    NSet the choke lever to g.
    NPress in the tab (1) and swing the 
    filter cover (2) down. 
    NClean away loose dirt from around 
    the filter.NRemove the felt element (3) from 
    the filter housing (4) and replace it – 
    knock out or blow out as a 
    temporary measure – do not wash.
    NReplace damaged parts.
    NFit the felt element (3) in the filter 
    housing (4).
    NClose the filter cover so that it snaps 
    into position.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.
    Cleaning the Air Filter
    232BA017 KN
    12
    232BA018 KN
    4
    3
    Engine Management 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    32 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 high speed screw within fine 
    limits.
    Standard Setting
    NStopping the Engine
    NMounting the cutting attachment
    NCheck the air filter and replace it if 
    necessary.
    NHave the spark arrestor checked – 
    see “Inspection and Maintenance 
    by DealerNTurn high speed screw (H) 
    counterclockwise as far as stop (no 
    more than 3/4 turn).
    NTurn the low speed screw (L) 
    carefully clockwise as far as stop, 
    then turn it back 1.5 turns.
    NStart and warm up the engine if 
    necessary.
    NAdjust idle speed with the idle speed 
    screw (LA) so that the cutting 
    attachment 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, sea level or 
    after changing the cutting attachment.Rule of thumb:
    Turn the high speed screw (H) about 
    one quarter of a turn for every 1000 m 
    (3300 ft) change in altitude.
    Conditions for adjustment
    NCarry out the standard setting.
    NStart the engine and, with the 
    mowing head mounted, warm it up 
    for about 3 minutes.
    NOpen the throttle wide.
    At high altitude
    NTurn the high speed screw (H) 
    clockwise (leaner), no further than 
    stop, until there is no further 
    noticeable increase in engine 
    speed.
    At sea level
    NTurn the high speed screw (H) 
    counterclockwise (richer), no further 
    than stop, until there is no further 
    noticeable increase in engine 
    speed.
    It is possible that maximum engine 
    speed may be reached with the standard 
    setting in each case.
    Adjusting the Carburetor
    LH
    LA
    233BA050 KN
    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 
    line limiter blade on the deflector).
    If a metal cutting attachment is 
    mounted, use the standard setting 
    and adjust the high speed 
    screw (H) as described above 
    under Rule of thumb. 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    33
    Aadjusting 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).
    NWarm up the engine.
    Engine stops while idling
    NTurn the idle speed screw (LA) 
    slowly clockwise until the engine 
    runs smoothly – the cutting 
    attachment must not turn.
    Cutting attachment rotates when 
    engine is idling
    NTurn the idle speed screw (LA) 
    counterclockwise until the cutting 
    attachment stops moving and then 
    rotate the screw another 1/2 to 1 
    turn in the same direction.
    Erratic idling behavior, engine stops 
    even though setting of LA-screw has 
    been corrected, poor acceleration
    Idle setting is too lean:
    NIdle setting is too lean: Rotate the 
    low speed screw (L) about 1/4 turn 
    counterclockwise until the engine 
    runs and accelerates smoothly.
    Erratic idling behavior 
    Idle setting is too richNRotate the low speed screw (L) 
    about 1/4 turn clockwise until the 
    engine runs and accelerates 
    smoothly.
    If engine is down on power, difficult to 
    start or runs poorly at idling speed, first 
    check the spark plug.
    Fit a new spark plug after approx. 100 
    operating hours or earlier if the 
    electrodes are badly eroded.
    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.
    Removing the Spark Plug
    NMove the stop switch to0.
    NPull off the spark plug boot (1).
    NUnscrew the spark plug.
    If the cutting attachment continues 
    to run when the engine is idling, 
    have your machine checked and 
    repaired by your servicing dealer.
    Spark Plug
    1
    232BA081 KN 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    34
    Checking the Spark Plug
    NClean dirty spark plug.
    NCheck electrode gap (A) and 
    readjust if necessary – see 
    Specifications.
    NUse 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.
    Installing the spark plug
    NScrew home the spark plug, fit the 
    boot and press it down firmly.If engine running behavior is 
    unsatisfactory even though the air filter 
    is clean and the carburetor is properly 
    adjusted, the cause may be the muffler.
    Have the muffler checked for 
    contamination (carbonization) by your 
    servicing dealer.
    STIHL recommends that you have 
    servicing and repair work carried out 
    exclusively by an authorized STIHL 
    servicing dealer.
    000BA039 KNA
    Warning!
    To reduce the risk of fire and burn injury, 
    use only spark plugs authorized by 
    STIHL. Always press spark plug boot (1) 
    snugly onto spark plug terminal (2) 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 con-
    nector in the boot may create arcing that 
    could ignite combustible fumes and 
    cause a fire.
    1
    2
    000BA071 KN
    Engine Running Behavior 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    35 To help prolong the wear life of the 
    starter rope, observe the following 
    points:
    NPull the starter rope only in the 
    direction specified.
    NDo not pull the rope over the edge of 
    the guide bushing.
    NDo not pull out the rope more than 
    specified.
    NDo not allow the starter grip to snap 
    back, guide it back into the housing 
    slowly – see chapter on Starting / 
    Stopping the Engine.
    Have a damaged starter rope replaced 
    by your dealer before it breaks 
    completely. STIHL recommends that 
    you have servicing and repair work 
    carried out exclusively by an authorized 
    STIHL servicing dealer.NCheck lubricant filling periodically 
    and after approx. every 25 hours of 
    operation
    NUnscrew the locking screw (1) – if 
    no grease can be seen on the 
    inside, then screw in the tube (2) of 
    STIHL gear lubricant for 
    brushcutters (special accessory)
    NSqueeze up to 1/5 oz (5 g) of 
    grease into the gear housing
    NUnscrew lubricant tube (2)
    NRefit locking screw and tighten 
    securelyFor periods of 3 months or longer
    NDrain and clean the fuel tank in a 
    well ventilated area.
    NDispose of fuel properly in 
    accordance with local 
    environmental requirements.
    NRun the engine until the carburetor 
    is dry – this helps prevent the 
    carburetor diaphragms sticking 
    together.
    NRemove, clean and inspect the 
    cutting attachment.
    NThoroughly clean the machine – 
    pay special attention to the cylinder 
    fins and air filter.
    NStore the machine in a dry and 
    secure location – out of the reach of 
    children and other unauthorized 
    persons.
    Rewind StarterLubricating the Gearbox
    Do not completely fill the gear 
    housing with grease.
    1
    233BA010 KN
    2
    Storing the Machine 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    36 NUse a sharpening file (see Special 
    Accessories) to sharpen dull 
    cutting attachments. In case of 
    more serious wear or nicks: 
    Resharpen with a grinder or have 
    the work done by a dealer – STIHL 
    recommends a STIHL servicing 
    dealer.
    NResharpen frequently, take away as 
    little material as possible: two or 
    three strokes of the file are usually 
    enough.
    NResharpen the cutters (1) uniformly 
    – do not alter the contour or the 
    parent blade (2) in any way.
    See cutting attachment packaging for 
    additional sharpening instructions.
    Balancing
    NAfter resharpening about 5 times, 
    check the cutting tool for out-of-
    balance on a STIHL balancer 
    (special accessory) or have it 
    checked by a dealer and re-
    balanced as necessary – STIHL 
    recommends a STIHL servicing 
    dealer.
    Maintenance Work
    STIHL recommends that you have 
    servicing and repair work carried out 
    exclusively by an authorized STIHL 
    servicing dealer.
    Fuel Pickup Body in Tank
    NHave the pickup body in the fuel 
    tank replaced every year.
    Spark Arrestor in Muffler
    NIf the engine is down on power, 
    have the spark arrestor in the 
    muffler checked.
    Sharpening Metal Cutting 
    Blades
    22 1
    002BA124 KN
    1
    Inspections and 
    Maintenance by Dealer 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish
    37
    Maintenance and Care
    The following intervals apply to normal operating conditions only. If your daily work-
    ing time is longer or operating 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
    if required
    Complete machineVisual inspection (condition, leaks)XX
    CleanX
    Control handle Check operationXX
    Air filterCleanXX
    ReplaceX
    Pickup body in fuel tankCheckX
    Have replaced by dealer
    1)XXX
    Fuel tank CleanXX
    CarburetorCheck idle adjustment – the cutting 
    attachment must not turnXX
    Readjust idle speedX
    Spark plugReadjust electrode gapX
    Replace after every 100 operating hours
    Cooling inletsVisual InspectionX
    CleanX
    Spark Arrestor in MufflerHave checked by dealer
    1)XX
    Have cleaned or replaced by servicing 
    dealer
    1)XX
    All accessible screws and nuts (not adjust-
    ing screws)RetightenX 
    						
    							FS 55, FS 55 C, FS 55 R, FS 55 RC English
    38
    Cutting AttachmentVisual InspectionXX
    ReplaceX
    Check tightnessXX
    Metal cutting attachment SharpenXX
    Safety labels ReplaceX
    1)STIHL recommends a STIHL servicing dealer. The following intervals apply to normal operating conditions only. If your daily work-
    ing time is longer or operating 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
    if required 
    						
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