2018 YAMAHA SUPERJET engine overheat

Table of contents
General and important labels ........... 1
Identification numbers .................... 1
Primary Identification (PRI-ID)
number............................................ 1
Craft Identification Number (CIN) ....... 1
Engine serial number.......................... 1
Manufactured date label .................... 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
Description....................................... 16
Watercraft glossary ....................... 16
Location of main components ...... 17
Control function operation ............. 19
Watercraft control functions ......... 19
Engine stop switch .......................... 19
Engine shut-off switch .................... 19
Start switch ..................................... 19
Throttle lever .................................... 20
Steering system ............................... 20
Steering pole .................................... 20
Fuel cock knob................................. 21
Choke knob ..................................... 21
Cooling water pilot outlet ................. 21
Water separator................................ 22
Engine overheat warning system ..... 22
Equipment operation ...................... 23
Equipment..................................... 23
Hood................................................. 23
Bow rope hole .................................. 24
Stern rope hole ................................. 24
Storage pouch .................................. 24
Fire extinguisher container ............... 25
Operation and handling
requirements ................................... 27
Fuel and engine oil
requirements .............................. 27
Fuel................................................... 27
2-stroke engine oil ............................ 28
Mixing fuel and oil ............................ 28
Filling the fuel tank ........................... 28
Draining the bilge water ................ 29
Draining the bilge water on water .... 29
Transporting.................................. 30
First-time operation ........................ 32
Engine break-in............................. 32
Pre-operation checks ..................... 33
Pre-operation checklist .................... 33
Pre-operation check points .......... 35
Pre-launch checks ........................... 35
Post-launch checks.......................... 39
Operation ......................................... 40
Operating your watercraft ............. 40
Getting to know your watercraft....... 40
Learning to operate your
watercraft ...................................... 40
Operating positions .......................... 40
Launching the watercraft ................. 41
Starting the engine on water ............ 41
Stopping the engine ......................... 43
Leaving the watercraft ...................... 43
Operating the watercraft .................. 43
Turning the watercraft ...................... 43
Stopping the watercraft.................... 45
Starting off........................................ 45
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Control function operation
19
EJU31026
Watercraft control functionsEJU31153Engine stop switch “ ”
The engine stop switch (red button) stops the
engine when the switch is pushed.
EJU31164Engine shut-off switch “ ”
The engine shut-off switch automatically
stops the engine when the clip, on the end of
the engine shut-off cord (lanyard), is removed
from the switch, such as if the operator falls
off the watercraft.
Insert the clip under the engine shut-off
switch before starting the engine.
When the engine is not running, remove the
clip from the engine shut-off switch to pre-vent accidental starting or unauthorized op-
eration by children or others.
EJU41051Start switch “ ”
NOTICE
ECJ01361
Do not run the engine for more than 15
seconds on land without supplying water,
otherwise the engine could overheat.
The start switch (green button) starts the en-
gine when the switch is pushed.
Release the start switch as soon as the en-
gine starts to run. If the engine does not start
in 5 seconds, release the start switch, wait 15
seconds, and then try again. NOTICE: Never
push the start switch while the engine is
running. Do not operate the start switch
for more than 5 seconds, otherwise the
battery will be discharged and the engine
1Engine stop switch
1Engine shut-off switch
2Clip
3Engine shut-off cord (lanyard)
1
STOP
312
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Control function operation
22
proper operation of the cooling system, make
sure that water is being discharged from the
cooling water pilot outlet. If water is not being
discharged from the outlet, stop the engine
and check the jet intake for clogging. (See
page 66 for information on the jet intake.)
TIP:
It will take about 20 seconds for the water
to reach the outlet after the engine is start-
ed.
Water discharge may not be constant
when the engine is running at idling speed.
If this occurs, apply a little throttle to make
sure that water discharges properly.
EJU40323Water separator
The water separator prevents water from en-
tering the fuel tank by collecting any water
that has entered the fuel tank breather hose if
the watercraft was capsized.
If water has collected in the water separator,
drain it by loosening the drain screw.
To drain water from the water separator:
(1) Place a drain pan or dry cloth under the
water separator.
(2) Gradually loosen the drain screw to drain
the water. Catch the draining water in the
drain pan or soak it up with the dry cloth
so that it does not spill into the engine
compartment. If any water spills into thewatercraft, be sure to wipe it up with a
dry cloth.
(3) Securely tighten the drain screw until it
stops.
EJU31665Engine overheat warning system
If the engine temperature rises significantly,
the engine overheat warning system will acti-
vate and the engine speed will be limited to
about 3400 r/min to help prevent damage.
If the engine overheat warning system is acti-
vated, immediately reduce the engine speed,
return to shore, and then make sure that wa-
ter is being discharged from the cooling wa-
ter pilot outlet while the engine is running. If
there is no discharge of water, stop the en-
gine, and then check the jet intake for clog-
ging. (See page 66 for information on the jet
intake.) NOTICE: If you cannot locate and
correct the cause of the overheating, con-
sult a Yamaha dealer. Continuing to oper-
ate at higher speeds could result in severe
engine damage.
[ECJ00042]
1Water separator
2Drain screw
2
1
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Pre-operation checks
38
Make sure that there is the proper amount of
throttle lever free play when the throttle lever
is in the fully closed (idle) position.
EJU32664Engine shut-off cord (lanyard) check
Make sure that the engine shut-off cord (lan-
yard) is not damaged. If the cord is damaged,
replace it. WARNING! Never try to repair
the engine shut-off cord (lanyard) or tie it
together. The engine shut-off cord (lan-
yard) may not pull free when the operator
falls off, allowing the watercraft to conti-
nue to run and cause an accident.
[EWJ01221]EJU41021
Switch checks
NOTICE
ECJ01361
Do not run the engine for more than 15
seconds 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. (See pages 19 to 19 for in-
formation on operating each switch.)
To check the operation of the switches:
(1) Push the start switch to make sure that
the engine starts.
(2) As soon as the engine starts running,
push the engine stop switch to make
sure that the engine stops immediately.
(3) Restart the engine, and then pull the en-
gine shut-off cord (lanyard) to remove
the clip from the engine shut-off switch
to make sure that the engine stops im-
mediately.
EJU41211Storage pouch checks
Make sure that the storage pouch is not dam-
aged and that water has not collected in the
pouch. Also, make sure that the storage
1Throttle lever free play
Throttle lever free play:
7.0–10.0 mm (0.28–0.39 in)
1Engine shut-off switch
2Clip
3Start switch
4Engine stop switch
5Engine shut-off cord (lanyard)
123
4
5
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Operation
41
wake, but the watercraft is moving through
the water rather than skimming on top of it.)
At very slow speeds, it may be necessary to
support your upper-body weight with your el-
bows resting on the gunwales, trailing your
legs in the water.
Standing
After you are comfortable handling the water-
craft from a kneeling position, try standing as
the watercraft gains speed. The watercraft
will become easier to balance as the speed
increases, because jet thrust provides stabil-
ity as well as directional control. When you
are moving slowly, or preparing to stop, you
will probably need to return to the kneeling
position to maintain your balance.
EJU32822Launching the watercraft
When launching the watercraft, make sure
that there are no obstacles around you.If the watercraft is launched from a trailer,
someone should make sure that waves do
not push the watercraft into the trailer.
After the watercraft is in the water, turn it
around so that the bow faces the direction
you wish to go.
EJU32836Starting the engine on water
WARNING
EWJ01521
Do not apply throttle when others are at
the rear of the watercraft. Turn the engine
off or keep it at idle. Water and debris ex-
iting the jet thrust nozzle can cause severe
injury.
To start the engine:
(1) Move the watercraft to an area that is
free from weeds and debris, and has a
water depth of at least 60 cm (2 ft) from
the bottom of the watercraft. NOTICE:
Never run the engine in water that is
less than 60 cm (2 ft) deep from the
bottom of the watercraft, otherwise
pebbles or sand could be sucked into
the jet intake, causing impeller dam-
age and engine overheating.
[ECJ00473]
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Operation
46
sharp turns or other maneuvers that
make it hard for others to avoid you or
understand where you are going. Avoid
areas with submerged objects or shal-
low water.
Take early action to avoid collisions. Re-
member, watercraft and other boats do
not have brakes. Do not release the
throttle lever when trying to steer away
from objects—you need throttle to
steer.
WARNING
EWJ00633
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.
NOTICE
ECJ01341
Never run the engine in water that is less
than 60 cm (2 ft) deep from the bottom of
the watercraft, otherwise pebbles or sand
could be sucked into the jet intake, caus-
ing impeller damage and engine overheat-
ing.
The watercraft is less stable when at a stand-
still or at a slow speed. It takes skill to keep
the watercraft upright when starting.
To stabilize the watercraft when accelerating
to planing speed, maintain a low center ofgravity by operating it in the kneeling posi-
tion.
Even though it is easier to start in shallow wa-
ter, you must learn deep-water boarding first.
You will inevitably fall off, so be sure you
know how to get back on the watercraft once
you are away from shore.
EJU33105Boarding and starting in shallow water
Be sure to learn the deep-water starting
method before operating the watercraft in
water where it is too deep for you to stand.
(See page 47 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 from the bottom of the water-
craft. NOTICE: Never run the engine in
water that is less than 60 cm (2 ft)
deep from the bottom of the water-
craft, otherwise pebbles or sand could
be sucked into the jet intake, causing
impeller damage and engine over-
heating.
[ECJ00473]
(2) Attach the engine shut-off cord (lanyard)
to your left wrist, and then attach the clip
to the engine shut-off switch.
(3) Grip the handlebars with both hands.
Place one knee on the riding tray and ba-
lance there.
(4) Look in all directions, start the engine,
and then begin to accelerate.
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Operation
49
see “Towing the watercraft” on page 68
or “Submerged watercraft” on page 69.)
NOTICE: Do not run the engine at full
throttle for at least 1 minute after the
engine has been restarted. Bilge wa-
ter in the engine compartment can
splash into the engine, which can re-
sult in severe damage.
[ECJ00554]
EJU33303
Beaching the watercraft
To beach the watercraft:
(1) Make sure that there are no boats, swim-
mers, or obstacles near the beach.
(2) Release the throttle lever to reduce
speed about 90 m (300 ft) before you
reach the intended beaching area.
(3) Slowly approach the beach and stop the
engine just before reaching land.
WARNING! You need throttle to steer.
Shutting the engine off can cause you
to hit an obstacle you are attempting
to avoid. A collision could result in se-
vere injury or death.
[EWJ00602] NOTICE:
Never run the engine in water that is
less than 60 cm (2 ft) deep from the
bottom of the watercraft, otherwise
pebbles or sand could be sucked into
the jet intake, causing impeller dam-
age and engine overheating.
[ECJ00473]
(4) Get off the watercraft and pull it up on the
beach.
EJU37194Operating in weeded areas
Always avoid using your watercraft in areas
where weed growth is thick. If operating in
weeded areas is unavoidable, alternately
squeeze the throttle lever and relax your grip
on the throttle lever to vary the engine speed.
Weeds tend to become clogged more when
operating at a steady speed and at trolling
speed. If weeds may have clogged the intakearea, clean the jet intake. (See page 66 for in-
formation on the jet intake.)
EJU41061After removing the watercraft from
the water
NOTICE
ECJ01361
Do not run the engine for more than 15
seconds on land without supplying water,
otherwise the engine could overheat.
After operating and removing the watercraft
from the water, promptly discharge the re-
maining water from the cooling water pas-
sages.
To discharge water from the cooling water
passages:
(1) Make sure that the area around the wa-
tercraft is clear, and then start the en-
gine.
(2) Discharge the remaining water out of the
cooling water passages by alternately
squeezing and releasing the throttle lever
quickly for 10 to 15 seconds.
(3) Stop the engine.
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Care and storage
50
EJU41192
Post-operation care
WARNING
EWJ00321
Always turn the fuel cock knob to “OFF”
when storing the watercraft, otherwise
fuel could leak out into the engine or en-
gine compartment, which would create a
fire hazard.
After using the watercraft, always take it out
of the water, clean it, and store it. Leaving the
watercraft in the water for extended periods
will accelerate the rate of normal deteriora-
tion of the jet pump and hull. Marine organ-
isms and corrosion are some of the
conditions that can shorten the life of many
watercraft components.
EJU3351AFlushing the cooling water passages
NOTICE
ECJ01361
Do not run the engine for more than 15
seconds on land without supplying water,
otherwise the engine could overheat.
Flush the cooling water passages to prevent
them from clogging with salt, sand, or dirt.
(1) Place the watercraft in a horizontal posi-
tion.
(2) Remove the hood. (See page 23 for hood
removal and installation procedures.)(3) Connect the garden hose adapter to a
garden hose.
(4) Loosen the flushing hose connector cap
and remove it. Insert the garden hose
adapter into the flushing hose connector
by pushing and twisting it until it is se-
curely connected.
(5) Connect the garden hose to a water tap.
(6) Make sure that the area around the wa-
tercraft is clear, and then start the en-
gine. Immediately after the engine starts,
turn the water supply on gradually until
1Garden hose adapter
2Garden hose
1Flushing hose connector
2Flushing hose connector cap
3Garden hose adapter
12
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