engine YAMAHA SUPERJET 2009 User Guide

Features and functions
20
is not running to prevent unauthorized use by
children or others.
EJU31171Start switch
Push the start switch (green button) to start
the engine.
The engine will not start when the clip is re-
moved from the engine shut-off switch.
EJU31200Choke knob
Starting a cold engine requires a richer air-fuel
mixture, which is supplied by the choke.
Pull the choke knob out to turn the choke on.
Push the choke knob in to turn the choke off.
EJU31210Throttle lever
Squeeze the throttle lever to increase engine
speed.
Release the throttle lever to decrease engine
speed or to return it to the idle position.
EJU31220Cooling water pilot outlet
This watercraft is equipped with a cooling wa-
ter pilot outlet.
1Engine shut-off cord (lanyard)
2Clip
3Engine shut-off switch
1Start switch
1Choke knob
1Throttle lever
UF2F71E0.book Page 20 Thursday, April 10, 2008 11:47 AM

Features and functions
21
When the engine is running, cooling water is
circulated in the engine, and then it is dis-
charged 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 oc-
curs, stop the engine and check for the cause.
(See pages 22 and 63 for more information.)
TIP:

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.

Water discharge may not be constant at
idle, therefore, open the throttle a little to
check that water discharges properly.
EJU35930Steering system
Your watercraft can be steered by turning the
handlebars in the direction you wish to travel.
When the handlebars are turned, the angle of
the jet thrust nozzle is changed, and the direc-
tion of the watercraft is changed accordingly.
Since the strength of the jet thrust determines
the speed and degree of a turn, throttle must
always be applied when attempting a turn, ex-
cept at trolling speed.
The angle of the jet thrust nozzle can be ad-
justed to suit operator preference. (See page
53 for adjustment procedures.)
1Handlebar
2Jet thrust nozzle
UF2F71E0.book Page 21 Thursday, April 10, 2008 11:47 AM

Features and functions
22
EJU31270Steering pole
The steering pole varies in height with the op-
erator’s posture, enabling the operator to as-
sume various riding positions.
When removing the hood for pre-operation
checks, maintenance, etc., lift the steering
pole and use the lock pin to support it. Move
the lock pin into the detent. Make sure that the
lock pin is returned to the stowed position af-
ter installing the hood.
EJU36000Bow rope hole
The bow rope hole is located at the bow of the
watercraft.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.
EJU31661Engine 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, check the intake grate and
1Steering pole
2Lock pin
1Bow rope hole
1Stern rope hole
UF2F71E0.book Page 22 Thursday, April 10, 2008 11:47 AM

Features and functions
23
impeller. (See page 63 for checking proce-
dures.) 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.
[ECJ00041]
EJU31672
Storage 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.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
UF2F71E0.book Page 23 Thursday, April 10, 2008 11:47 AM

Operation
24
EJU31791
Fuel and oil EJU31832Fuel
WARNING
EWJ00282

Gasoline and gasoline vapors are ex-
tremely flammable. To avoid fires and
explosions and to reduce the risk of in-
jury when refueling, follow these in-
structions.

Gasoline is poisonous and can cause in-
jury or death. Handle gasoline with care.
Never siphon gasoline by mouth. If you
should swallow some gasoline, inhale a
lot of gasoline vapor, or get some gaso-
line in your eyes, see your doctor imme-
diately. If gasoline spills on your skin,
wash with soap and water. If gasoline
spills on your clothing, change your
clothes.
NOTICE
ECJ00321

Do not use leaded gasoline. Leaded gas-
oline can seriously damage the engine.

Avoid getting water and contaminants in
the fuel tank. Contaminated fuel can
cause poor performance and engine
damage. Use only fresh gasoline that
has been stored in clean containers.
EJU31861Gasohol
There are two types of gasohol: gasohol con-
taining ethanol and that containing methanol.Gasohol containing ethanol can be used if
ethanol content does not exceed 10% and the
fuel meets the minimum octane ratings. E-85
is a fuel blend containing 85% ethanol and
therefore must not be used in this watercraft.
All ethanol blends containing more than 10%
ethanol can cause fuel system damage or en-
gine performance problems.
Yamaha does not recommend gasohol con-
taining methanol because it can cause fuel
system damage and engine performance
problems.
EJU318712-stroke engine oil
If YAMALUBE 2-W engine oil is not available,
another 2-stroke engine oil with an NMMA-
certified TC-W3 rating may be used.
EJU31901Mixing fuel and oil
NOTICE
ECJ00331
Make sure that the gasoline and oil are
thoroughly mixed in the correct ratio, oth-
erwise severe engine damage could re-
sult.
Recommended gasoline:
Regular unleaded gasoline with a mini-
mum octane rating of
86 (Pump octane number) = (R +
M)/2
90 (Research octane number)
Recommended engine oil:
YAMALUBE 2-W or TC-W3 outboard
motor oil or equivalent
UF2F71E0.book Page 24 Thursday, April 10, 2008 11:47 AM

Operation
25
Pour 2-stroke engine oil into a clean contain-
er, and then add gasoline. To mix them thor-
oughly, shake the container from side to side.
EJU31912Filling the fuel tank
(1) Lift the steering pole and support it with
the lock pin.
(2) Remove the hood. (See page 17 for hood
removal and installation procedures.)
(3) Remove the fuel tank filler cap, and then
slowly add premixed fuel to the fuel tank.
Stop filling when the fuel level just reach-
es the bottom of the filler tube. Do not fill
up the filler tube. Because fuel expands
when it heats up, heat from the engine or
the sun can cause fuel to spill out of thefuel tank. Do not leave the watercraft with
a full tank in direct sunlight.
(4) Wipe up any spilled fuel immediately.
(5) Install the fuel tank filler cap and the
hood. Make sure that the fuel tank filler
cap is securely closed before operating
the watercraft.
12-stroke engine oil
2Gasoline
Fuel-to-oil ratios (gasoline to oil)
Break-in period (first two tankfuls):
25:1
After break-in:
50 :1
Fuel tank capacity:
To t a l :
18 L (4.8 US gal, 4.0 Imp.gal)
Reserve:
5.5 L (1.5 US gal, 1.2 Imp.gal)
UF2F71E0.book Page 25 Thursday, April 10, 2008 11:47 AM

Operation
26
EJU31980
Pre-operation checks EJU31991Pre-operation check list
Before operating this watercraft, perform the checks in the following check list.
WARNING
EWJ00411
Failure to inspect or maintain the watercraft properly increases the possibility of an ac-
cident or damage to the watercraft. Do not operate the watercraft if you find any prob-
lem. If a problem cannot be corrected by the procedures provided in this manual, have
the watercraft inspected by a Yamaha dealer.
TIP:
Pre-operation checks should be made each time the watercraft is used. These checks can be
completed in a short time. It is worth the time spent to ensure safety and reliability.
ITEM ROUTINE PAGE
BEFORE LAUNCH OR OPERATION
Engine compartmentRemove the hood to ventilate the engine compart-
ment. Check for fuel vapors and loose electrical con-
nections.27
BilgeCheck for water and fuel and drain if necessary. 28
Throttle leverCheck that the throttle lever springs back smoothly. 29
Steering systemCheck for proper operation. 29
FuelCheck the fuel level and replenish if necessary.
Check the hoses and tank for leakage.27
Water separatorCheck for water and drain if necessary. 27
BatteryCheck the electrolyte level and battery condition. 28
HoodCheck that the hood is securely closed. 17
Hull and deckCheck the hull and deck for cracks and other dam-
age.27
Jet intakeCheck for debris and remove if necessary. 30
Fire extinguisherCheck the condition and replace if necessary. 28
Engine shut-off cord (lan-
yard)Check the condition and replace if frayed or broken. 30
SwitchesCheck the start switch, engine stop switch, and en-
gine shut-off switch for proper operation.30
AFTER LAUNCH
Cooling water pilot outletCheck that water is discharged while the engine is
running and the watercraft is in the water.31
UF2F71E0.book Page 26 Thursday, April 10, 2008 11:47 AM

Operation
27
EJU32280Pre-operation check points EJU32291Engine compartment
WARNING
EWJ00460
Failure to ventilate the engine compart-
ment could result in a fire or explosion. Do
not start the engine if there is a fuel leak or
a loose electrical connection.
Ventilate the engine compartment before
each use.
To ventilate the engine compartment, lift the
steering pole and support it with the lock pin,
and then remove the hood. (See page 17 for
hood removal and installation procedures.)
Leave the engine compartment open for a few
minutes to allow any fuel vapors to escape.
While the engine compartment is open, check
for loose electrical connections.
EJU32350Hull and deck
Check the hull and deck for cracks and other
damage. If any damage is found, have a
Yamaha dealer repair the watercraft.
EJU32361Fuel system
Make sure that there is sufficient fuel in the
fuel tank before each use.
Also, check the fuel system for leakage,
cracks, and malfunctions. (See page 51 for
check points and correct procedures.)(1) Remove the fuel tank filler cap to release
any pressure that might have built up in
the fuel tank.
(2) Remove the hood. (See page 17 for hood
removal and installation procedures.)
(3) Check the fuel level in the fuel tank and
replenish if necessary. (See page 25 for
filling procedures.)
(4) Install the fuel tank filler cap and the
hood.
EJU32420Water separator
Check the water separator for water. The wa-
ter separator retains any water that may have
entered through the fuel tank breather hose if
the watercraft was capsized. Normally, the
water separator is empty.
If water remains in the water separator, drain
it by removing the drain screw. Place a drain
pan under the water separator to catch the
1Water separator
2Drain screw
UF2F71E0.book Page 27 Thursday, April 10, 2008 11:47 AM

Operation
28
draining water or use a dry cloth to soak up
any water that could spill into the watercraft. If
any water spills into the watercraft, be sure to
wipe it up with a dry cloth. Also, be sure to in-
stall the drain screw after draining the water
separator.
EJU32432Bilge
Check the bilge. Wipe up any remaining mois-
ture or fuel residue with a dry rag. NOTICE:
Excessive water in the engine compart-
ment can splash into the engine, which
can result in severe damage.
[ECJ00341]
EJU32482
Battery
Check the battery electrolyte level and check
that the battery has sufficient power to start
the engine easily. WARNING! Never operate
the watercraft if the battery does not have
sufficient power to start the engine or if it
shows any other signs of decreased pow-
er. Loss of battery power may leave you
stranded.
[EWJ01240]
Recharge the battery or replace it if it is not in
good condition. (See page 57 for battery re-
charging procedures.)
Also, check that the battery leads are tight-
ened securely and that there is no corrosion
on the battery terminals. Check that the
breather hose is securely connected to the
battery and that it is not pinched. WARNING!
Fire or explosion could result if the breath-er hose is damaged, obstructed, or not
connected properly.
[EWJ00451]
Make sure that the battery is securely held in
place.
EJU32501Fire extinguisher
Check that there is a full fire extinguisher on
board.
The fire extinguisher container is located on
the hood under the steering pole.
1Positive (+) battery terminal: Red lead
2Negative (–) battery terminal: Black lead
3Breather hose
UF2F71E0.book Page 28 Thursday, April 10, 2008 11:47 AM

Operation
30
turned, and that there is no free play between
the handlebars and the jet thrust nozzle.
EJU32620Steering pole
Check the steering pole for looseness.
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.
EJU32651Jet 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, clean
it. (See page 63 for jet intake cleaning proce-
dures.)
If the watercraft is operated while the jet in-
take is clogged, cavitation could occur, reduc-
ing jet thrust, and possibly damaging the jet
pump. In some cases, the engine may over-
heat because of lack of cooling water, anddamage to the engine could result. Cooling
water is fed to the engine by the jet pump.
EJU32661Engine shut-off cord (lanyard)
Check that the engine shut-off cord (lanyard)
is not frayed or broken. If the cord is dam-
aged, replace it. WARNING! Never try to re-
pair the engine shut-off cord (lanyard) or
tie it together. The engine shut-off cord
(lanyard) may not pull free when the oper-
ator falls off, allowing the watercraft to
continue to run and cause an accident.
[EWJ01220]
EJU32671
Switches
NOTICE
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.
UF2F71E0.book Page 30 Thursday, April 10, 2008 11:47 AM