YAMAHA SUPERJET 2003 Owner's Manual

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EJU01007
FEATURES AND
FUNCTIONS
Location of main components .............. 2-1
Operation of controls and other
functions ................................................... 2-3
Hood ....................................................... 2-3
Fuel tank filler cap .................................. 2-4
Fuel cock knob ....................................... 2-4
Engine stop switch ................................. 2-5
Engine shut-off switch ............................ 2-5
Choke knob ............................................ 2-6
Throttle lever .......................................... 2-6
Start switch ............................................. 2-6
Cooling water pilot outlet ....................... 2-7
Steering system ..................................... 2-7
Steering pole .......................................... 2-8
Engine overheat warning system .......... 2-9
Storage pouch ...................................... 2-10
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2-1
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EJU01008
Location of main components
1Rope hole
Use to attach rope for transporting, mooring or
towing the watercraft in an emergency.
2Storage pouch
3Steering pole
Adjusts to suit operator’s riding posture.
4Handlebars
Use to control direction.
5Riding tray
Stand or kneel here for balance.
6Fuel tank filler cap
7Hood
8Steering cover9Hood latch
Locks the hood.
0Jet thrust nozzle
Changes the direction of jet thrust according
to handlebar position.
ACooling water pilot outlet
Use to verify cooling water flow.
BIntake grate
Prevents debris from getting into the jet pump.
CJet intake
DRide plate
EDrive shaft
Transmits power from the engine to the jet
pump.
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1Fire extinguisher container
2Fuel cock knob
Use to select either normal or reserve fuel flow
from the fuel tank to the carburetors, or to shut
off fuel flow.
3Choke knob
Use to start a cold engine.
4Clip
Insert into the engine shut-off switch to enable
starting of the engine.
Remove to stop the engine or prevent acci-
dental star ting of the engine or unauthorized
use of the watercraft.
5Start switch
Push to start the engine.
6Throttle lever
Use to accelerate and decelerate.
7Engine shut-off switch
Remove the clip to stop the engine and dis-
able it from starting.8Engine stop switch
Push to stop the engine normally.
9Engine shut-off cord (lanyard)
Attach to wrist so that the engine stops if the
operator falls off the watercraft.
0Bow
AFuel tank
BBattery
CSilencer
Prevents water from getting into the engine
and reduces air intake noise.
DSpark plugs/Spark plug caps
EMuffler
FWater separator
Traps water from the breather hose to the fuel
tank.
GFuel filter
HFlush hose connector
Use to flush the engine cooling water pas-
sages.
IElectrical box
Protects electrical components from water.
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2-3
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EJU01009
Operation of controls and
other functions
EJU01272
Hood
The hood is secured at the rear by a
latch.
Lift the steering pole and support it with
the lock pin before removing the hood.
To remove the hood:
1. Turn the latch knob 1 to the open posi-
tion, and then pull up on the hood
latch2 to unlatch the hood.
2. Grasp the hood using the handgrips 3
provided at the front and rear side of the
hood. Lift the hood up and to the rear to
remove it.
To install the hood:
1. Position the hood on the deck so the two
projections at the front of the hood fit
under the two stays on the deck.
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2-4
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2. Push down on the hood latch, and then
turn the knob to the lock position.
NOTE:@ Make sure that the hood is properly secured
before operating the watercraft.
@
EJU01012
Fuel tank filler cap
To remove the fuel tank filler cap 1, turn it
counterclockwise.
NOTE:@ Make sure that the fuel tank filler cap is prop-
erly secured before operating the watercraft.
@
EJU01014
Fuel cock knob
The fuel cock supplies fuel from the fuel
tank to the carburetors.
The fuel cock knob1 positions are
explained as follows and are shown in the
illustration.
OFF:
With the fuel cock knob in this position,
fuel does not flow. Always turn the fuel cock
knob to this position when the engine is not
running.
ON:
With the fuel cock knob in this position,
fuel flows to the carburetors. Turn the fuel
cock knob to this position when starting the
engine and operating the watercraft.
RES:
This indicates reserve. With the fuel cock
knob in this position, the fuel reserve is
made available. Tur n the fuel cock knob to
this position if you run out of fuel while oper-
ating the watercraft. When this occurs,
refuel as soon as possible and be sure to
turn the fuel cock knob back to “ON”!
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Engine stop switch
Push this switch 1 (red button) to stop
the engine normally.
EJU01016
Engine shut-off switch
Insert the clip 1, on the end of the engine
shut-off cord 2, under the engine shut-off
switch 3 (black button). The engine will stop
automatically when the clip is removed from
the switch, such as if the operator falls off
the watercraft.
WARNING@
Always attach the engine shut-off cord
to your wrist and the clip to the engine
shut-off switch BEFORE starting the
engine.

To prevent accidental starting of the
engine or unauthorized use by chil-
dren or others, always remove the clip
from the shut-off switch when the
engine is not running.
@
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Choke knob
Starting a cold engine requires a richer
air-fuel mixture, which is supplied by the
choke.
Pull the knob 1 out to turn the choke on.
Push the knob in to turn the choke off.
EJU01018
Throttle lever
Squeeze the throttle lever 1 to increase
engine speed.
Release the throttle lever to decrease
engine speed or to return it to the idle posi-
tion.
EJU01019
Start switch
Push the start switch 1 (green button) to
start the engine.
NOTE:@ The engine will not start when the clip is
removed from the engine shut-off switch.
@
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Cooling water pilot outlet
This watercraft is equipped with a cooling
water pilot outlet.
When the engine is running, cooling
water is circulated in the engine, and then it
is discharged from the pilot outlet.
To check for proper operation of the cool-
ing system, check that water is being dis-
charged from the pilot outlet. If water is not
being discharged from the outlet, cooling
water may not be circulating in the engine.
When this occurs, stop the engine and
check for the cause. (See pages 2-9 and 5-3
for further instructions.)
NOTE:@ If the cooling water passages are dry, it will
take about 20 seconds for the water to reach
the outlet after the engine is started.
@
EJU01021
Steering system
Your watercraft can be steered by turning
the handlebars 1 the same direction you
wish to travel.
When the handlebars are turned, the
angle of the jet thrust nozzle 2 is changed,
and the direction of the watercraft is
changed accordingly. Since the strength of
the jet thrust determines the speed and
direction of a turn, the throttle must always
be open when attempting a turn, except at
trolling speed.
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Steering pole
The steering pole varies in height with the
operator’s posture, enabling the operator to
assume various riding positions.
When removing the hood for pre-opera-
tion checks, maintenance, etc., lift the steer-
ing pole 1 and use the lock pin 2 to
support it. Move the lock pin into the detent.
Make sure the lock pin is returned to the
stowed position after installing the hood.
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Engine overheat warning
system
This model is equipped with an engine
overheat warning system.
If the engine starts to overheat, the
engine speed will be limited to about
3,400 r/min.
When this occurs, check for water dis-
charge at the cooling water pilot outlet. If
there is no discharge of water, reduce the
engine speed and beach the watercraft, and
then check the intake grate and impeller for
clogging.
WARNING@ Before attempting to remove weeds or
debris from the intake grate or impeller,
shut the engine off and remove the clip
from the engine shut-off switch. Severe
injury or death could result from coming
in contact with the rotating parts of the
jet pump.
@
CAUTION:@ If you cannot locate and correct the
cause of the overheating, consult a
Yamaha dealer. Continuing to operate at
higher speeds could result in severe
engine damage.
@
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