engine YAMAHA SUPERJET 2001 User Guide

2-6
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EJU00350
Choke knob
Starting a cold engine requires a richer
air-fuel mixture, which is supplied by the
choke.
Pull the knob 1 out to turn the choke on.
Push the knob in to turn the choke off.
EJU00918
Throttle lever
Squeeze the throttle lever 1 to increase
engine speed. Release the throttle lever to
decrease engine speed or to return it to the
idle position.
EJU00919
Start switch
Push the start switch 1 (green button) to
start the engine.
NOTE:@The engine will not start when the clip is
removed from the engine shut-off switch.
@
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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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E
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EJU00410
OPERATION
Fuel and oil................................................ 3-1
Gasoline .................................................. 3-1
2-stroke engine oil................................... 3-2
Mixing fuel and oil .................................. 3-3
Filling the fuel tank .................................. 3-4
Pre-operation checks............................... 3-5
Pre-operation check list .......................... 3-5
Pre-operation check points..................... 3-6
Operation................................................. 3-13
Engine break-in ..................................... 3-13
Starting the engine................................ 3-15
Stopping the engine.............................. 3-18
Leaving the watercraft .......................... 3-18
Operating your watercraft..................... 3-19
Getting to know your watercraft............ 3-19
Learning to operate your watercraft ..... 3-19
Starting the watercraft........................... 3-21
Operating positions ............................... 3-25
Capsized watercraft .............................. 3-26
Turning the watercraft........................... 3-27
Stopping the watercraft......................... 3-29
Beaching the watercraft ........................ 3-30
Rough water operation ......................... 3-30
Post-operation checks.......................... 3-31
Transporting........................................... 3-33
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3-1
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Fuel and oil
Gasoline
WARNING@GASOLINE AND ITS VAPORS ARE
HIGHLY FLAMMABLE AND EXPLOSIVE!
●Do not smoke when refueling, and
keep away from sparks, flames, or
other sources of ignition.
●Stop engine before refueling.
●Refuel in a well-ventilated area. 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.
●Tighten the filler cap securely after
refueling.
●If you should swallow some gasoline,
inhale a lot of gasoline vapor, or get
gasoline in your eyes, get immediate
medical attention.
●If any gasoline spills onto your skin,
immediately wash with soap and
water. Change clothing if gasoline
spills on it.
@
CAUTION:@Use only fresh gasoline that has been
stored in clean containers.
@
Recommended gasoline:
Regular unleaded gasoline:
Minimum octane rating:
86 (Pump octane number): (R+M)/2
90 (Research octane number)
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3-2
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Gasohol
There are two types of gasohol: gasohol
containing ethanol and that containing meth-
anol.
Gasohol containing ethanol can be used
if ethanol content does not exceed 10% and
the fuel meets minimum octane ratings.
Gasohol containing methanol is not rec-
ommended by Yamaha because it can
cause fuel system damage or engine perfor-
mance problems.
EJU00939
2-stroke engine oil
If YAMALUBE 2-W is not available,
another 2-stroke engine oil with an NMMA-
certified TC-W3 rating may be used.Recommended engine oil:
YAMALUBE 2-W
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3-3
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Mixing fuel and oil
CAUTION:@●Avoid using any mixture of gasoline
and oil other than those designated.
●Make sure gasoline and oil are thor-
oughly mixed in the correct ratio, oth-
erwise the following problems may
occur. Too little oil in the fuel mixing
ratio could result in major engine trou-
ble, such as seizure. Too much oil in
the fuel mixing ratio could result in
fouled spark plugs, smoky exhaust, or
heavy carbon deposits.
@
Pour 2-stroke engine oil into a clean con-
tainer, and then add gasoline. To mix them
thoroughly, shake the container from side to
side.
Fuel mixing ratios
(gasoline to oil)
Break-in period
(first two tankfuls): 25 : 1
After break-in: 50 : 1
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Filling the fuel tank
CAUTION:@Be careful when refueling. Avoid getting
water or other contaminants in the fuel
tank. Contaminated fuel can cause poor
running or engine damage.
@
1. Lift the steering pole and support it with
the lock pin.
2. Remove the hood.
3. Open the fuel tank filler cap, and slowly
add the premixed fuel to the fuel tank.
4. Stop filling when the fuel level just
reaches the bottom of the filler tube.
NOTE:@●The hood must be removed in order to
watch the fuel level in the fuel tank while
adding fuel.
●Be careful not to spill fuel or overfill the
tank.
●Do not fill into the filler tube because fuel
could overflow.
@
Fuel tank capacity:
Total: 18 L (4.8 US gal, 4.0 Imp gal)
Reserve: 5.5 L (1.45 US gal, 1.21 Imp gal)
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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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Pre-operation check points
Engine compartment
Ventilate the engine compartment, before
each use. To ventilate the engine compart-
ment, lift the steering pole and support it
with the stopper pin, then remove the hood.
Put the hood aside for a few minutes to allow
any fuel vapors to escape. Also, check for
loose electrical connections.
WARNING@Failure to ventilate the engine compart-
ment could result in fire or explosion. Do
not start the engine if there is a fuel leak
or loose electrical connection.
@
EJU00427
Fuel system
Check the fuel system for leakage, cracks or
malfunctions before each use. (See page 4-10
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, and then check the
fuel level in the tank. Replenish if neces-
sary. (See page 3-4 for filling instruc-
tions.)
3. Close the fuel tank filler cap securely.
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