2008 YAMAHA SUPERJET engine overheat

Operation
44
(5) Flush the cooling system to prevent it
from clogging with salt, sand, or dirt. (See
page 46 for flushing procedures.)
(6) Drain residual water from the exhaust
system by alternately squeezing and re-
leasing the throttle lever for 10 to 15 sec-
onds while the engine is running.
CAUTION:
ECJ00561
Do not run the engine for more than 15
seconds without supplying water, other-
wise the engine could overheat.
(7) If the watercraft will be stored for a week
or more, lubricate internal engine compo-
nents to help prevent corrosion. (See
page 47 for lubrication procedures.)
(8) Rinse the engine and engine compart-
ment with a small amount of water.
CAUTION:
ECJ00570
Do not use high-pressure water when rins-
ing the engine or engine compartment as
severe engine damage could result.
(9) Wipe the engine and engine compart-
ment dry with a clean cloth (repeat step 3,
if necessary).
(10) Wipe the hull, steering pole, handlebars,
and jet unit dry with a clean cloth.
(11) Spray a rust inhibitor on metallic parts to
minimize corrosion.
(12) Allow the engine compartment to air dry
completely before installing the hood.
EJU33420
Transporting
WARNING
EWJ00750
Always turn the fuel cock knob to “OFF”
when transporting the watercraft, other-
wise fuel could leak out into the engine or
engine compartment, which would create
a fire hazard.
Transport this watercraft using a special trail-
er that incorporates a hole into which the pin
can be inserted and locked after passing it
through the bow rope hole.
After securing the bow with the pin, secure the
stern with ropes or tie downs routed over the
1Pin
2Bow rope hole
UF2F70E0.book Page 44 Tuesday, April 17, 2007 9:56 AM

Maintenance and care
47
(8) Remove the garden hose adapter and in-
stall the flushing hose connector cap.
EJU33561Lubrication
WARNING
EWJ00300
To reduce the risk of fire or explosion:
Never pour or spray gasoline, or any sub-
stance other than a rust inhibitor through
the hole in the carburetor silencer cover.
CAUTION:
ECJ00151

Be sure to install the silencer cap se-
curely after fogging the engine, other-
wise water could enter the engine and
cause damage.

Do not run the engine for more than 15
seconds without supplying water, other-
wise the engine could overheat.
(1) Remove the silencer cap.
(2) Start the engine with the watercraft in a
well-ventilated area.
(3) With the engine running at a fast idle,
quickly spray as much rust inhibitor as
possible through the hole in the silencer
cover. Keep spraying until the engine
stalls (or a maximum of 15 seconds).
(4) Install the silencer cap securely.
(5) Lubricate all cables such as the throttle,
choke, and steering cables.
NOTE:
Use a suitable marine grease applicator to
pressure-lubricate the cables and purge out
any moisture between the inner and outer ca-
bles.
(6) Lubricate the areas of the watercraft
specified in “Lubrication points” on page
58.
EJU33640Fuel system
WARNING
EWJ00290
GASOLINE AND ITS VAPORS ARE HIGH-
LY FLAMMABLE AND EXPLOSIVE!

Do not smoke when refueling, and keep
away from sparks, flames, and other
sources of ignition.

Stop the engine before refueling.

Refuel in a well-ventilated area with the
watercraft in a horizontal position.

Do not stand or sit on the watercraft
while refueling in case of fire.

Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags. Always properly dispose of
gasoline-soaked rags.

Avoid overfilling the fuel tank. Stop fill-
ing when the fuel level just reaches the
bottom of the filler tube. Do not fill up the
filler tube because fuel expands as it
warms up and could overflow. If tempo-
rarily leaving the watercraft with a full
fuel tank, do not leave it in direct sun-
light. Leave it in a well-ventilated area
with the watercraft in a horizontal posi-
tion.

Tighten the fuel tank filler cap securely
after refueling.

If you should swallow some gasoline, in-
hale a lot of gasoline vapor, or get gaso-
1Silencer cap
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Trouble recovery
65
EJU34620
Emergency procedures EJU34630Cleaning the jet intake and impeller
If weeds or debris get caught in the jet intake
or impeller, cavitation can occur, causing jet
thrust to decrease even though engine speed
rises. If this condition is allowed to continue,
the engine will overheat and may seize. If
there is any sign that the jet intake or impeller
is clogged with weeds or debris, return to
shore and check the intake and impeller. Al-
ways stop the engine before beaching the wa-
tercraft.
WARNING
EWJ00780
Before attempting to remove weeds or de-
bris from the jet intake or impeller area,
shut the engine off and remove the clip
from the engine shut-off switch. Severe in-
jury or death could result from coming incontact with the rotating parts of the jet
pump.
CAUTION:
ECJ00650
If weeds or debris get caught in the jet in-
take, do not operate the watercraft above
trolling speed until they have been re-
moved.
(1) Turn the watercraft on its side as shown.
UF2F70E0.book Page 65 Tuesday, April 17, 2007 9:56 AM

Index
2-stroke engine oil .................................... 25
B
Battery ................................................ 29, 48
Battery, checking...................................... 60
Battery, jumping ....................................... 66
Beaching the watercraft ........................... 43
Bilge ......................................................... 29
Boarding and starting in deep water ........ 39
Boarding and starting in shallow water .... 38
Bow rope hole .......................................... 22
C
Capsized watercraft ................................. 40
Carburetor, adjusting................................ 61
Choke cable, adjusting ............................. 59
Choke knob .............................................. 20
Cleaning the watercraft ............................ 48
Cooling water pilot outlet .................... 20, 32
Craft Identification Number (CIN) ............... 1
Cruising limitations ..................................... 8
E
Emergency procedures ............................ 65
Engine break-in ........................................ 33
Engine compartment ................................ 28
Engine overheat warning system ............. 22
Engine serial number ................................. 1
Engine shut-off cord ................................. 32
Engine shut-off switch .............................. 19
Engine stop switch ................................... 19
Enjoy your watercraft responsibly ............ 14
F
Filling the fuel tank ................................... 26
Fire extinguisher....................................... 29
Flushing the cooling system ..................... 46
Fuel and oil............................................... 25
Fuel cock knob ......................................... 18
Fuel filter .................................................. 53
Fuel system ........................................ 28, 47
Fuel system, checking.............................. 53
Fuel tank .................................................. 53
Fuel tank filler cap .................................... 18
Fuse, replacing......................................... 67
G
Gasohol .................................................... 25
Gasoline ................................................... 25Getting to know your watercraft ............... 36
H
Hazard information ................................... 12
Hood ......................................................... 17
Hull and deck ........................................... 28
I
Identification numbers ................................ 1
Important labels .......................................... 2
J
Jet intake .................................................. 31
Jet intake and impeller, cleaning .............. 65
Jet thrust nozzle angle, adjusting ............. 55
Jet thrust nozzle angle, checking ............. 53
Jumper cables, connecting ...................... 66
K
Kneeling ................................................... 37
L
Labels, other .............................................. 6
Labels, warning .......................................... 3
Launching the watercraft .......................... 33
Learning to operate your watercraft ......... 36
Leaving the watercraft .............................. 35
Limitations on who may operate
the watercraft .......................................... 7
Lubrication................................................ 47
Lubrication points ..................................... 58
M
Main components, location of .................. 15
Maintenance and adjustments ................. 49
Mixing fuel and oil .................................... 25
O
Operating positions .................................. 37
Operating your watercraft ......................... 36
Operation ................................................. 33
Operation of controls and
other functions ...................................... 17
Operation requirements ............................. 9
Owner’s/operator’s manual and tool kit .... 49
P
Periodic maintenance chart ...................... 51
Post-operation care .................................. 43
Pre-operation check list ............................ 27
Pre-operation check points ...................... 28
Pre-operation checks ............................... 27
Primary Identification (PRI-ID) number ...... 1
UF2F70E0.book Page 1 Tuesday, April 17, 2007 9:56 AM