2007 YAMAHA SUPERJET engine overheat

Table of contents
General and important labels ........... 1
Identification numbers .................... 1
Primary Identification (PRI-ID)
number ........................................... 1
Hull Identification Number (HIN) ........ 1
Engine serial number ........................ 1
Model information ........................... 2
Builder’s plate .................................... 2
Important labels .............................. 3
Warning labels ................................... 4
Other labels ....................................... 7
Safety information ............................. 8
Limitations on who may operate
the watercraft .............................. 8
Cruising limitations ......................... 9
Operation requirements ............... 10
Recommended equipment ........... 12
Hazard information ....................... 13
Watercraft characteristics ............. 13
Safe boating rules ........................ 14
Enjoy your watercraft
responsibly ................................ 15
Features and functions ................... 16
Location of main components ...... 16
Operation of controls and other
functions .................................... 18
Hood ................................................ 18
Fuel tank filler cap ........................... 19
Fuel cock knob ................................ 19
Engine stop switch .......................... 20
Engine shut-off switch ..................... 20
Start switch ...................................... 20
Choke knob ..................................... 20
Throttle lever ................................... 21
Cooling water pilot outlet ................. 21
Steering system ............................... 22
Steering pole ................................... 22
Bow rope hole ................................. 22
Stern rope hole ................................ 23
Engine overheat warning system .... 23
Storage pouch ................................. 24
Operation ......................................... 25
Fuel and oil .................................. 25
Gasoline .......................................... 25
2-stroke engine oil ........................... 25
Mixing fuel and oil ............................ 25
Filling the fuel tank .......................... 26
Pre-operation checks ................... 27
Pre-operation check list ................... 27
Pre-operation check points .............. 28
Operation ..................................... 33
Engine break-in ............................... 33
Launching the watercraft ................. 33
Starting the engine .......................... 33
Stopping the engine ........................ 35
Leaving the watercraft ..................... 36
Operating your watercraft ............ 36
Getting to know your watercraft ....... 36
Learning to operate your
watercraft ..................................... 36
Operating positions ......................... 37
Starting the watercraft ..................... 38
Boarding and starting in deep
water ............................................ 39
Capsized watercraft ......................... 40
Turning the watercraft ..................... 41
Stopping the watercraft ................... 43
Beaching the watercraft ................... 43
Rough water operation .................... 43
Post-operation care ...................... 44
Transporting ................................. 45
Maintenance and care .................... 46
Storage ........................................ 46
Flushing the cooling system ............ 46
Lubrication ....................................... 47
Fuel system ..................................... 47
Battery ............................................. 48
Cleaning the watercraft ................... 48
Maintenance and adjustments ..... 49
Owner’s/operator’s manual and
tool kit ........................................... 49
Periodic maintenance chart ............. 51
Checking the fuel system ................ 52
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Features and functions
23
The bow rope hole is used to attach a rope to
the watercraft when transporting, mooring, or
towing it in an emergency.
EJU36010Stern rope hole
The stern rope hole is located at the stern of
the watercraft.
The stern rope hole is used to attach a rope to
the watercraft when mooring it.
EJU31660Engine overheat warning system
This model is equipped with an engine over-
heat warning system.
If the engine starts to overheat, the engine
speed will be limited to about 3400 r/min.
If this occurs, immediately reduce the engine
speed, return to shore, and then check for wa-
ter discharge at the cooling water pilot outlet
while the engine is running. If there is no dis-
charge of water, shut the engine off, and thencheck the intake grate and impeller for clog-
ging.
WARNING
EWJ00050
Before attempting to remove weeds or de-
bris 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.
1Bow rope hole
1Stern rope hole
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Features and functions
24
CAUTION:
ECJ00040
If you cannot locate and correct the cause
of the overheating, consult a Yamaha deal-
er. Continuing to operate at higher speeds
could result in severe engine damage.
EJU31670Storage pouch
A storage pouch is provided on the underside
of the hood for the owner’s/operator’s manual,
tool kit, and other small items.
Bend the owner’s/operator’s manual slightly
to insert it into the storage pouch, and then
add the tool kit and any other small items.
Fold the pouch, and then wrap the strap
around it. Install the storage pouch on the
hood and secure it with the bands.
NOTE:
The storage pouch is not waterproof. If you
carry objects that must be kept dry, such as
the manual, put them in a waterproof bag.
1Storage pouch
1Band
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Operation
31
Move the steering pole up and down to make
sure that operation is smooth and unrestricted
throughout the whole range. Also, make sure
that the steering pole does not have any side
play.
EJU32650Jet intake
Carefully check the jet intake for weeds, de-
bris, or anything else that might restrict the in-
take of water. If the jet intake is clogged,
cavitation could occur, reducing jet thrust, and
possibly damaging the jet pump.
In some cases, the engine may overheat be-
cause of lack of cooling water, and damage to
the engine could result. Cooling water is fed to
the engine by the jet pump. (See page 64 for
jet intake cleaning procedures.)
WARNING
EWJ00470

Keep away from the intake grate while
the engine is on. Items such as long hair,
loose clothing, or PFD straps can be-
come entangled in moving parts, result-
ing in severe injury or drowning.

Stop the engine and remove the clip
from the engine shut-off switch before
removing any debris or weeds, whichmay have collected around the jet in-
take.
EJU32660Engine shut-off cord
Check that the engine shut-off cord is not
frayed or broken. If the cord is damaged, re-
place it; never try to repair it or tie it together.
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Operation
32
EJU32670Switches
CAUTION:
ECJ00410
Do not run the engine for more than 15
seconds when checking the switches on
land without supplying water, otherwise
the engine could overheat.
Check the start switch, the engine stop
switch, and the engine shut-off switch for
proper operation.
Push the start switch to start the engine. As
soon as the engine starts running, push the
engine stop switch to verify that the engine
stops immediately. Restart the engine, and
then pull the engine shut-off cord to remove
the clip from the engine shut-off switch to ver-
ify that the engine stops immediately. (See
pages 20 to 20 for information on proper op-
eration of the start switch, the engine stop
switch, and the engine shut-off switch.)
EJU32680Cooling water pilot outlet
Check that water comes out from the cooling
water pilot outlet while the engine is runningand the watercraft is in the water. (See page
21 for more information.)
1Engine shut-off switch
2Start switch
3Engine shut-off cord
4Engine stop switch
5Clip
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Operation
34
WARNING
EWJ00570
Never operate in water that is less than 60
cm (2 ft) deep, otherwise you increase
your chance of hitting a submerged ob-
ject, which could result in injury.
CAUTION:
ECJ00470
Never operate in water that is less than 60
cm (2 ft) deep, otherwise pebbles or sand
could be sucked into the jet intake, caus-
ing impeller damage and engine overheat-
ing.
(2) Turn the fuel cock knob to “ON”.
NOTE:
If the watercraft has been sitting for a while,
remove the fuel tank filler cap to release any
built-up pressure in the fuel tank due to fuelexpansion, and then install the filler cap be-
fore starting the engine.
(3) Attach the engine shut-off cord to your left
wrist, and then attach the clip to the en-
gine shut-off switch.
WARNING
EWJ00580
Check that the engine shut-off cord is not
frayed or broken, and keep it free from the
handlebars so that the engine stops if the
operator falls off. The engine shut-off cord
may not pull free if wrapped around the
handlebars when the operator falls off, al-
lowing the watercraft to continue to run
and cause an accident.
1Clip
2Engine shut-off switch
3Engine shut-off cord
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Operation
39
You will inevitably fall off, so be sure you know
how to get back on the watercraft once you
are away from shore.
EJU33100Boarding and starting in shallow water
Be sure to learn the deep-water starting meth-
od before operating the watercraft in water
where it is too deep for you to stand. (See
page 39 for the deep-water starting method.)
(1) Launch the watercraft in water free from
weeds and debris and at least 60 cm (2 ft)
deep.
WARNING
EWJ00640
Never operate in water that is less than 60
cm (2 ft) deep, otherwise you increase
your chance of hitting a submerged ob-
ject, which could result in injury.
CAUTION:
ECJ00500
Never operate in water that is less than 60
cm (2 ft) deep, otherwise pebbles or sand
could be sucked into the jet intake, caus-
ing impeller damage and engine overheat-
ing.
(2) Attach the engine shut-off cord to your left
wrist, and then attach the clip to the en-
gine shut-off switch.
(3) Grip the handlebars with both hands.
Place one knee on the riding tray and bal-
ance there.(4) Start the engine and begin to accelerate.
(5) Pull your other knee up onto the riding
tray as the watercraft speed increases.
(6) Move as far forward as possible without
interfering with the movement of the han-
dlebars. Keep your body perpendicular to
the water, with your weight forward and
low.
NOTE:
The watercraft will become easier to balance
as the speed increases, because jet thrust
provides stability as well as directional control.
EJU33120Boarding and starting in deep water
(1) Swim to the rear of the watercraft. Attach
the engine shut-off cord to your left wrist,
and then attach the clip to the engine
shut-off switch.
(2) Grip the handlebars with both hands. Pull
your body up onto the riding tray and bal-
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Operation
40
ance there, using your elbows on the
gunwales for leverage.
(3) Start the engine and begin to accelerate.
(4) Continue to pull your body up onto the
watercraft as the watercraft speed in-
creases.
(5) Bring your knees up onto the riding tray
and change to a kneeling position as
soon as you can do so.
WARNING
EWJ00630
Avoid forceful jet thrust and limited visibil-
ity while reboarding. Get to a standing or
kneeling position quickly, but do not ex-
pose yourself to the forceful jet thrust.
(6) Move as far forward as possible without
interfering with the movement of the han-
dlebars. Keep your body perpendicular to
the water, with your weight forward and
low.(7) Once the bow drops, and the watercraft
has leveled out in the water and reached
planing speed, back off the throttle and
select your desired speed.
NOTE:

The watercraft will become easier to bal-
ance as the speed increases, because jet
thrust provides stability as well as direction-
al control.

It will take longer for a heavier operator to
reach planing speed than it will for a light
operator.
EJU33200Capsized watercraft
If the watercraft capsizes, turn it over immedi-
ately.
Be sure to carefully follow the procedures be-
low to prevent injury, or damage to the water-
craft.
WARNING
EWJ00670
IMPROPER UPRIGHTING CAN CAUSE IN-
JURY:

Be sure to shut the engine off by pulling
on the engine shut-off cord to remove
the clip from the engine shut-off switch.

Do not put your hands in the intake
grate.
CAUTION:
ECJ00510
Be sure to remove the clip from the engine
shut-off switch to shut the engine off, oth-
erwise the engine can overheat, which can
result in severe damage.
(1) Remove the clip from the engine shut-off
switch.
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