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Yamaha F 15 Owners Manual

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    25 
    Operation 
    EMU26901 
    Installation
    CAUTION:
     
    ECM00110  
    Incorrect engine height or obstructions
    to smooth water flow (such as the design
    or condition of the boat, or accessories
    such as transom ladders or depth finder
    transducers) can create airborne water
    spray while the boat is cruising. Severe
    engine damage may result if the motor is
    operated continuously in the presence of 
    airborne water spray.
    NOTE:
     
    During water testing check the buoyancy of
    the boat, at rest, with its maximum load.
    Check that the static water level on the ex-
    haust housing is low enough to prevent wa-
    ter entry into the powerhead, when water
    rises due to waves when the outboard is not 
    running. 
    EMU26910 
    Mounting the outboard motor
    WARNING
     
    EWM00820  
     
    Overpowering a boat could cause se-
    vere instability. Do not install an out-
    board motor with more horsepower
    than the maximum rating on the capac-
    ity plate of the boat. If the boat does not
    have a capacity plate, consult the boat
    manufacturer. 
     
    The information presented in this sec-
    tion is intended as reference only. It is
    not possible to provide complete in-
    structions for every possible boat and
    motor combination. Proper mounting
    depends in part on experience and the 
    specific boat and motor combination.
    WARNING
     
    EWM00830  
    Improper mounting of the outboard mo-
    tor could result in hazardous conditions
    such as poor handling, loss of control, or
    fire hazards. Observe the following: 
     
    For permanently mounted models, your
    dealer or other person experienced in
    proper rigging should mount the motor.
    If you are mounting the motor yourself,
    you should be trained by an experi-
    enced person. 
     
    For portable models, your dealer or oth-
    er person experienced in proper out-
    board motor mounting should show 
    you how to mount your motor. 
    Mount the outboard motor on the center line
    (keel line) of the boat, and ensure that the
    boat itself is well balanced. Otherwise the
    boat will be hard to steer. For boats without
    a keel or which are asymmetrical, consult
    your dealer. 
    EMU26920 
    Mounting height 
    To run your boat at optimum efficiency, the
    water resistance (drag) of the boat and out-
    board motor must be made as little as possi-
    ble. The mounting height of the outboard 
    1. Center line (keel line)
    ZMU017601 
    						
    							 
    Operation 
    26 
    motor greatly affects the water resistance. If
    the mounting height is too high, cavitation
    tends to occur, thus reducing the propulsion;
    and if the propeller tips cut the air, the engine
    speed will rise abnormally and cause the en-
    gine to overheat. If the mounting height is too
    low, the water resistance will increase and
    thereby reduce engine efficiency. Mount the
    outboard motor so that the anti-cavitation
    plate is between the bottom of the boat and
    a level 25 mm (1 in.) below it.
    NOTE:
     
     
    The optimum mounting height of the out-
    board motor is affected by the boat and
    motor combination and the desired use.
    Test runs at different heights can help de-
    termine the optimum mounting height.
    Consult your Yamaha dealer or boat man-
    ufacturer for further information on deter-
    mining the proper mounting height. 
     
    For instructions on setting the trim angle of 
    the outboard motor, see page 38. 
    EMU26970 
    Clamping the outboard motor 
    1. Place the outboard motor on the tran-
    som so that it is positioned as close to
    the center as possible. Tighten the tran-
    som clamp screws evenly and securely.
    Occasionally check the clamp screws
    for tightness during operation of the out-
    board motor because they could be-come loose due to engine vibration.
    WARNING
     
    EWM00640  
    Loose clamp screws could allow the out-
    board motor to fall off or move on the
    transom. This could cause loss of control
    and serious injury. Make sure the tran-
    som screws are tightened securely. Oc-
    casionally check the screws for tightness 
    during operation. 
    2. If the engine restraint cable attachment
    is equipped on your engine, an engine
    restraint cable or chain should be used.
    Attach one end to the engine restraint
    cable attachment and the other to a se-
    cure mounting point on the boat. Other-
    wise the engine could be completely lost
    if it accidentally falls off the transom.
    3. Secure the clamp bracket to the transom
    using the bolts provided with the out-
    ZMU02011
    0–25mm
    (0–1in.)ZMU02012
    ZMU02013 
    						
    							 
    Operation 
    27 
    board (if packed). For details, consult
    your Yamaha dealer.
    WARNING
     
    EWM00650  
    Avoid using bolts, nuts or washers other
    than those contained in the engine pack-
    aging. If used, they must be of at least the
    same quality of material and strength and
    must be tightened securely. After tighten-
    ing, test run the engine and check their 
    tightness. 
    EMU30172 
    Breaking in engine 
    Your new engine requires a period of break-
    in to allow mating surfaces of moving parts to
    wear in evenly. Correct break-in will help en-
    sure proper performance and longer engine
    life.
    CAUTION:
     
    ECM00800  
    Failure to follow the break-in procedure
    could result in reduced engine life or 
    even severe engine damage. 
    EMU27080 
    Procedure for 4-stroke models 
    Run the engine under load (in gear with a
    propeller installed) as follows.
    1. For the first hour of operation:Run the engine at 2000 r/min or at ap-
    proximately half throttle.
    2. For the second hour of operation:
    Run the engine at 3000 r/min or at ap-
    proximately three-quarter throttle.
    3. For the next eight hours of operation:
    Avoid continuous operation at full throt-
    tle for more than five minutes at a time.
    4. After the first 10 hours:
    Operate the engine normally. 
    EMU27101 
    Preoperation checks
    WARNING
     
    EWM00080  
    If any item in the preoperation check is
    not working properly, have it inspected
    and repaired before operating the out-
    board motor. Otherwise an accident 
    could occur.
    CAUTION:
     
    ECM00120  
    Do not start the engine out of water. Over-
    heating and serious engine damage can 
    occur. 
    EMU27110 
    Fuel 
     
    Check to be sure you have plenty of fuel
    for your trip. 
     
    Make sure there are no fuel leaks or gaso-
    line fumes. 
     
    Check fuel line connections to be sure they
    are tight (if equipped Yamaha fuel tank or
    boat tank). 
     
    Be sure the fuel tank is positioned on a se-
    cure, flat surface, and that the fuel line is
    not twisted or flattened, or likely to contact
    sharp objects (if equipped Yamaha fuel
    tank or boat tank). 
    EMU27130 
    Controls 
     
    Check throttle, shift, and steering for prop- 
    1. Bolts
    ZMU02631
    1 
    						
    							 
    Operation 
    28 
    er operation before starting the engine. 
     
    The controls should work smoothly, with-
    out binding or unusual free play. 
     
    Look for loose or damaged connections. 
     
    Check operation of the starter and stop
    switches when the outboard motor is in the
    water. 
    EMU27140 
    Engine 
     
    Check the engine and engine mounting. 
     
    Look for loose or damaged fasteners. 
     
    Check the propeller for damage. 
    EMU27163 
    Checking the engine oil level 
    1. Put the outboard motor in an upright po-
    sition (not tilted).
    2. Remove oil dipstick and wipe it clean.
    3. Completely insert the dipstick and re-
    move it again.
    4. Check the oil level using the dipstick to
    be sure the level falls between the upper
    and lower marks. Fill with oil if it is below
    the lower mark, or drain to the specified
    level if it is above the upper mark.
    NOTE:
     
    Be sure to completely insert the dipstick into 
    the dipstick guide. 
    EMU30021 
    Filling fuel
    WARNING
     
    EWM00060  
    Gasoline and its vapors are highly flam-
    mable and explosive. Keep away from
    sparks, cigarettes, flames, or other 
    sources of ignition. 
    1. Remove the fuel tank cap.
    2. Carefully fill the fuel tank.
    3. Securely close the cap after filling the
    tank. Wipe up any spilled fuel. 
    EMU27270 
    Ring Free Fuel Additive 
    Gasoline is a precise blend of many different
    substances, each chosen to give certain
    characteristics. Gasoline blends have been
    changing in recent years in response to con-
    cerns about pollution and resulting emis-
    sions regulations. One of the most obvious
    changes has been the elimination of lead
    from most fuels.
    As gasoline has changed, the amount of ad-
    ditives such as aromatics and oxygenates
    has increased. These additives are impor-
    tant for the engines in passenger cars, but
    they can have detrimental effects in marine
    engines, because of increased deposits in
    the combustion chamber. When enough de-
    posits collect, piston rings begin sticking.
    Performance drops and engine wear in-
    creases dramatically.
    While many additives available may reduce
    deposits, Yamaha recommends the use of 
    Ring Free Fuel Additive 
    , available from
    your Yamaha dealer.  
    Ring Free Fuel Addi-
    tive 
     has repeatedly proven its ability to clean
    combustion deposits from inside the engine,
    notably the critical piston-ring-land area, and
    fuel system components. Follow product la-
    beling for use instructions. 
    1. Lower level mark
    2. Oil dipstick
    3. Upper level mark
    ZMU02082
    1
    3
    2 
    						
    							 
    Operation 
    29 
    EMU27450 
    Operating engine 
    EMU27461 
    Feeding fuel (portable tank)
    WARNING
     
    EWM00420  
     
    Before starting the engine, make sure
    that the boat is tightly moored and that
    you can steer clear of any obstructions.
    Be sure there are no swimmers in the
    water near you. 
     
    When the air vent screw is loosened,
    gasoline vapor will be released. Gaso-
    line is highly flammable, and its vapors
    are flammable and explosive. Refrain
    from smoking, and keep away from
    open flames and sparks while loosen-
    ing the air vent screw. 
     
    This product emits exhaust gases
    which contain carbon monoxide, a col-
    orless, odorless gas which could cause
    brain damage or death when inhaled.
    Symptoms include nausea, dizziness,
    and drowsiness. Keep cockpit and cab-
    in areas well ventilated. Avoid blocking 
    exhaust outlets. 
    1. If there is an air vent screw on the fuel
    tank cap, loosen it 2 or 3 turns.
    2. If there is a fuel joint on the motor, firmly
    connect the fuel line to the joint. Then
    firmly connect the other end of the fuelline to the joint on the fuel tank.
    3. If a steering friction adjuster is provided
    on your outboard motor, securely attach
    the fuel line to the fuel line clamp.
    NOTE:
     
    During engine operation place the tank hori-
    zontally, otherwise fuel cannot be drawn 
    from the fuel tank.
    4. Squeeze the primer pump with the outlet
    end up until you feel it become firm.
    ZMU02022
    ZMU02024
    ZMU02023
    ZMU02025 
    						
    							 
    Operation 
    30 
    EMU27490 
    Starting engine 
    EMU27505 
    Manual start models (tiller control) 
    1. Place the gear shift lever in neutral.
    NOTE:
     
    The start-in-gear protection device prevents
    the engine from starting except when in neu- 
    tral.
    2. Attach the engine stop switch lanyard to
    a secure place on your clothing, or your
    arm or leg. Then install the lock plate on
    the other end of the lanyard into the en-
    gine stop switch.
    WARNING
     
    EWM00120  
     
    Attach the engine stop switch lanyard
    to a secure place on your clothing, or
    your arm or leg while operating. 
     
    Do not attach the lanyard to clothing
    that could tear loose. Do not route thelanyard where it could become entan-
    gled, preventing it from functioning. 
     
    Avoid accidentally pulling the lanyard
    during normal operation. Loss of en-
    gine power means the loss of most
    steering control. Also, without engine
    power, the boat could slow rapidly. This
    could cause people and objects in the 
    boat to be thrown forward. 
    3. Place the throttle grip in the “”
    (start) position.
    4. Pull out / turn the choke knob fully. After
    the engine starts, replace / return the
    knob to the home position.
    ZMU01988
    N
    N
    ZMU04881
    ZMU02026
    ZMU02027 
    						
    							 
    Operation 
    31
    NOTE:
     
     
    It is not necessary to use the choke when
    starting a warm engine. 
     
    If the choke knob is left in the “”
    (start) position while the engine is running, 
    the engine will run poorly or stall.
    5. Pull the manual starter handle slowly un-
    til you feel resistance. Then give a
    strong pull straight out to crank and start
    the engine. Repeat if necessary.
    6. After the engine starts, slowly return the
    manual starter handle to its original po-
    sition before releasing it.
    7. Slowly return the throttle grip to the fully
    closed position.
    NOTE:
     
     
    When the engine is cold, it needs to be
    warmed up. For further information, see
    page 35. 
     
    If the engine does not start on the first try,
    repeat the procedure. If the engine fails to
    start after 4 or 5 tries, open the throttle a
    small amount (between 1/8 and 1/4) and
    try again. Also if the engine is warm and
    fails to start, open the throttle a same
    amount and try to start the engine again. If 
    the engine still fails to start, see page 74. 
    EMU27562 
    Electric start models 
    1. Place the gear shift lever in neutral.
    ZMU02355
    ZMU02029
    ZMU02030
    ZMU01988
    N 
    						
    							 
    Operation 
    32
    NOTE:
     
    The start-in-gear protection device prevents
    the engine from starting except when in neu- 
    tral.
    2. Attach the engine stop switch lanyard to
    a secure place on your clothing, or your
    arm or leg. Then install the lock plate on
    the other end of the lanyard into the en-
    gine stop switch.
    WARNING
     
    EWM00120  
     
    Attach the engine stop switch lanyard
    to a secure place on your clothing, or
    your arm or leg while operating. 
     
    Do not attach the lanyard to clothing
    that could tear loose. Do not route the
    lanyard where it could become entan-
    gled, preventing it from functioning. 
     
    Avoid accidentally pulling the lanyard
    during normal operation. Loss of en-
    gine power means the loss of most
    steering control. Also, without engine
    power, the boat could slow rapidly. This
    could cause people and objects in the 
    boat to be thrown forward. 
    3. Place the throttle grip in the “”
    (start) position. After the engine starts,
    return the throttle to the fully closed po-
    sition.
    4. Pull out / turn the choke knob fully. After
    the engine starts, replace / return the
    knob to the home position.
    NOTE:
     
     
    It is not necessary to use the choke when
    starting a warm engine.
    N
    ZMU04881ZMU02026
    ZMU02027
    ZMU02355 
    						
    							 
    Operation 
    33 
     
    If the choke knob is left in the “”
    (start) position while the engine is running, 
    the engine will run poorly or stall.
    5. Push the starter button to start the mo-
    tor. (Repeat if necessary.)
    6. Immediately after the engine starts, re-
    lease the starter button to allow it to re-
    turn to its original position.
    7. Slowly return the throttle grip to the fully
    closed position so that the engine does
    not stall.
    CAUTION:
     
    ECM00160  
     
    Never push the starter button while the
    engine is running. 
     
    Do not keep the starter motor turning
    for more than 5 seconds. If the starter
    motor is turned continuously for more
    than 5 seconds, the battery will be
    quickly discharged, thus making it im-
    possible to start the engine. The starter
    can also be damaged. If the engine will
    not start after 5 seconds of cranking,
    release the starter button, wait 10 sec- 
    onds, then crank the engine again.
    NOTE:
     
     
    When the engine is cold, it needs to be
    warmed up. For further information, see
    page 35. 
     
    If the engine does not start on the first try,repeat the procedure. If the engine fails to
    start after 4 or 5 tries, open the throttle a
    small amount (between 1/8 and 1/4) and
    try again. Also if the engine is warm and
    fails to start, open the throttle a same
    amount and try to start the engine again. If 
    the engine still fails to start, see page 74. 
    EMU27642 
    Electric start / remote control models 
    1. Place the remote control lever in neutral.
    NOTE:
     
    The start-in-gear protection device prevents
    the engine from starting except when in neu- 
    tral.
    2. Attach the engine stop switch lanyard to
    a secure place on your clothing, or your
    arm or leg. Then install the lock plate on
    the other end of the lanyard into the en-
    gine stop switch.
    WARNING
     
    EWM00120  
     
    Attach the engine stop switch lanyard
    to a secure place on your clothing, or
    your arm or leg while operating. 
     
    Do not attach the lanyard to clothing
    that could tear loose. Do not route the
    lanyard where it could become entan-
    gled, preventing it from functioning. 
     
    Avoid accidentally pulling the lanyard
    during normal operation. Loss of en-
    ZMU04880 
    						
    							 
    Operation 
    34 
    gine power means the loss of most
    steering control. Also, without engine
    power, the boat could slow rapidly. This
    could cause people and objects in the 
    boat to be thrown forward. 
    3. Turn the main switch to “” (on).
    4. Open the throttle slightly without shifting
    using the neutral throttle lever or free ac-
    celerator. You may need to change the
    throttle opening slightly depending on
    engine temperature. After the engine
    starts, return the throttle to the original
    position.
    NOTE:
     
     
    On remote controls equipped with a neu-
    tral throttle lever, a good starting point is to
    lift the lever just until you feel resistance,
    then lift slightly more. 
     
    The neutral throttle lever or free accelera-
    tor can only be used when the remote con- 
    trol lever is in neutral.
    5. Press in and hold the main switch to op-
    erate the remote choke system. The re-
    mote choke switch automatically returns
    to its normal position when you release
    your hand. Therefore keep the switch
    pressed in.
    NOTE:
     
     
    It is not necessary to use the choke when
    starting a warm engine. 
     
    Push in the main switch fully, or the remote 
    choke system will not operate.
    OFF
    ON
    ZMU01880
    N
    ZMU02314
    START OFFON
    ZMU02315 
    						
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