2001 YAMAHA SUPERJET cooling

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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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Location of main components
1Rope hole
Use to attach rope for transporting or mooring.
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 to steer the watercraft.
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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Cooling water pilot outlet
This watercraft is equipped with a cooling
water pilot outlet on the port (left) side of the
watercraft.
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 cooling system,
check that water is being discharged from
the pilot outlet. If water is not being dis-
charged 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.
@
EJU00356
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 water-
craft is changes 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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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 3,000 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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Pre-operation checks
Pre-operation check list
Before operating this watercraft, perform the checks in the following check list. See the
accompanying text in this chapter for details on how to perform the checks.
WARNING@If any item in the pre-operation check list is not working properly, have it inspected
and repaired before operating the watercraft, otherwise an accident could occur.
@
NOTE:@Pre-operation checks should be made thoroughly each time the watercraft is used. This pro-
cedure can be completed in a short time. It is worth the time spent to assure safety and reli-
ability.
@
ITEM ROUTINE PAGE
Engine compar tment Remove hood, ventilate fuel vapors and check
electrical connections3-6
Bilge Check for water and fuel residue and remove if
necessary3-7
Throttle Check that throttle lever springs back 3-10
Steering system Check for proper steering system operation 3-10
Fuel Check fuel level and add if necessary
Check hoses and tank for leakage3-6
Water separator Check for water and drain if necessary 3-7
Battery Check electrolyte level and battery condition 3-8
Hood Check that hood latches are secured 2-3
Hull/Deck Check hull for cracks or other damage —
Jet unit Check for debris and remove if necessary 3-11
Fire extinguisher Check condition and replace if necessary 3-9
Engine shut-off cord Check condition and replace if frayed or broken 3-11
Switches Check start switch, engine stop switch and
engine shut-off switch for proper operation when
watercraft is in the water 3-12
Cooling water pilot outlet Check that water is discharged while engine is
running and watercraft is in the water3-12
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Jet unit
Carefully check the jet intake for weeds,
debris, or anything else that might restrict
the intake of water. If the intake is clogged,
cavitation could occur, reducing jet thrust,
and possibly damaging the jet pump. In
some cases, the engine may overheat
because of lack of cooling water, and dam-
age to the engine could result. Engine cool-
ing water is fed to the engine by the jet
pump. (See page 5-3 for jet intake cleaning
procedures).
WARNING@●Keep away from intake grate while
engine is on. Items such as long hair,
loose clothing, or PFD straps can
become entangled in moving parts
resulting in severe injury or drowning.
●Stop the engine and remove the clip
from the engine shut-off switch before
removing any debris or weeds which
may have collected around the jet
intake.
@
EJU9001a
Engine shut-off cord (lanyard)
Check that the engine shut-off cord is not
frayed or broken. If the cord is damaged,
replace it; never try to repair it or tie it
together.
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Switches
Check the start switch 1, the engine stop
switch 2 and the engine shut-off switch 4
for proper operation. To check these
switches place the watercraft in the water to
provide adequate engine cooling. Start the
engine, and then pull the engine shut-off
cord5 to remove the clip 3 from the
engine shut-off switch. Verify that the engine
stops immediately. (See pages 3-15 to 3-18
for information on proper operation of the
start switch, the engine stop switch and the
engine shut-off switch.)
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Cooling water pilot outlet
Check that water comes out from the out-
let while the engine is running and the
watercraft is in the water.
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Post-operation checks
Always perform the following post-opera-
tion checks after operating the watercraft.
1. Remove the watercraft from the water.
2. Wash down the hull, steering pole, han-
dlebars, and jet unit with fresh water.
3. Remove the hood and check the engine
compartment for water. To drain excess
water, turn the watercraft on its port (left)
side. If necessary, turn the watercraft
upside down to drain water completely.
CAUTION:@●Place a suitable clean cloth or carpet-
ing underneath the watercraft to pro-
tect it from abrasions and scratches.
●Always turn the watercraft over onto
its port (left) side.
●When turning the watercraft onto its
side or inverting it, support the bow
and secure the steering pole, other-
wise the steering pole and handlebars
could be bent or damaged.
@
NOTE:@This watercraft is equipped with an auto-
matic bilge-draining system that removes
water from the engine compartment while
you are underway. However, some residual
water will remain.
@
4. Put the watercraft in a horizontal posi-
tion.
5. Flush the cooling system to prevent it
from clogging with salt, sand, or dirt.
(See pages 4-1 to 4-2 for flushing the
cooling system procedures.)
6. Drain residual water from the exhaust
system by alternately squeezing and
releasing the throttle lever for 10 to
15 seconds while the engine is running.
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