engine YAMAHA FX 2003 Workshop Manual

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EJU01850
Stopping the watercraft
The watercraft is not equipped with a sep-
arate braking system. It is stopped by water
resistance when the throttle lever is
released. From full speed, the watercraft
comes to a complete stop in approximately
100 m (330 ft) after the throttle is released
and the engine is stopped, although this dis-
tance will vary depending on many factors,
including gross weight, water surface condi-
tions, and wind direction. The watercraft
slows down as soon as the throttle lever is
released, but will coast for a distance before
fully stopping. If you are not sure you can
stop in time before hitting an obstacle, apply
throttle and turn in another direction.
WARNING@
Allow adequate stopping distance.

Take early action to avoid collisions.
Remember, watercraft and other boats
do not have brakes.

Operate defensively at safe speeds
and keep a safe distance away from
people, objects, and other watercraft
to give you time to stop.

Do not shut the engine off when slow-
ing down in case you need engine
power to steer away from a boat or
other obstacle that comes into your
path.

Do not use the reverse function to
slow down or stop the watercraft as it
could cause you to lose control, be
ejected, or impact the handlebars.
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EJU01081
Beaching the watercraft
1. Make sure no obstructions, boats or
swimmers are near the beach. Release
the throttle lever about 100 m (330 ft)
before you reach the intended beaching
area.
2. Approach the beach slowly and stop the
engine before reaching land.
Remember: you need throttle to steer.
3. Get off the watercraft and pull it up on
the beach.
CAUTION:@ Small pebbles, sand, seaweed, and other
debris can be pulled into the jet intake
and impair or damage the impeller.
Always stop the engine and get off
before beaching the watercraft.
EJU01082
Docking the watercraft
1. Make sure that no obstructions, boats or
swimmers are close to the watercraft.
Reduce speed about 100 m (330 ft)
away from the dock.
2. Slowly approach the dock and stop the
engine just before coming alongside it.
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EJU01254
Reverse on waterways
Reverse can be used for slow speed
maneuvering when it is necessary to back
up out of tight spots where you cannot turn
around. Reverse can only be used to slow
down or stop during low speed maneuver-
ing, such as when docking.
Once the engine is idling, shift to reverse
and gradually increase engine speed. Make
sure that there are no obstacles or people
behind you before shifting to reverse.
EJU01255
Rough water operation
The force of landing after jumping can
cause a strong impact on both the watercraft
and the operator and passengers. It is pos-
sible for the operator to hit his or her chest or
jaw on the watercraft body or handlebars
and be injured. Do not operate the water-
craft with your chin right above the handle-
bars or with your feet outside the watercraft.
Operating in rough water or jumping waves
can also crack the watercraft body or dam-
age internal parts. Avoid operating in rough
water or bad weather conditions.
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Post-operation checks
Always perform the following post-opera-
tion checks after operating the watercraft.
1. Remove the watercraft from the water.
2. Wash down the hull, handlebars, and jet
unit with fresh water.
3. Remove the seat and check the engine
compartment for water. To drain excess
water, remove the stern drain plugs, and
then raise the bow of the watercraft
enough to allow water in the bilge to
drain out.
NOTE:@ This watercraft is equipped with a jet vac-
uum bilge draining system and an electric
bilge draining system that remove water
from the engine compartment while you are
underway. However, some residual water will
remain. (See “Bilge” on page 3-9 for more
information.)
4. Put the watercraft in a horizontal posi-
tion.
5. Flush the cooling system to prevent it
from clogging with salt, sand, or dirt.
(See page 4-1 for flushing procedures.)
6. Drain residual water from the exhaust
system by alternately squeezing and
releasing the throttle lever for 10 to
15 seconds while the engine is running.
CAUTION:@ Do not run the engine for more than
15 seconds on land. The engine could
overheat.
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3-35
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7. If the watercraft will be stored for a week
or more, lubricate internal engine com-
ponents to help prevent corrosion. (See
page 4-3 for lubrication procedures.)
8. Rinse the engine and engine compart-
ment with a small amount of water.
CAUTION:@ Do not use high pressure when rinsing
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, 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 seat.
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E
4
EJU01086
MAINTENANCE AND
CARE
Storage ...................................................... 4-1
Flushing the cooling system .................. 4-1
Lubrication .............................................. 4-3
Fuel system ............................................ 4-4
Battery .................................................... 4-5
Cleaning the watercraft .......................... 4-6
Maintenance and adjustments .............. 4-7
Owner’s/Operator’s Manual and
tool kit ..................................................... 4-8
Periodic maintenance chart ................... 4-9
Inspecting the fuel system ................... 4-10
Changing the engine oil ....................... 4-11
Checking the air filter element ............. 4-13
Inspecting the jet thrust
nozzle angle ......................................... 4-14
Inspecting the shift cable ..................... 4-14
Inspecting and adjusting the
throttle cable ......................................... 4-14
Inspecting the QSTS mechanism ....... 4-15
Cleaning and adjusting the
spark plugs ........................................... 4-16
Lubrication points ................................. 4-18
Inspecting the battery .......................... 4-21
Adjusting the fuel injection system ...... 4-23
Replacing the fuse ............................... 4-24
Specifications ........................................ 4-25
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EJU18121
Storage
WARNING@ Always place the watercraft upright in a
horizontal position when storing it, oth-
erwise fuel could leak out into the engine
or engine compartment, which could
result in a fire hazard.
@
Storage for prolonged periods of time,
such as winter storage, requires preventa-
tive maintenance to ensure against deterio-
ration. It is advisable to have the watercraft
serviced by a Yamaha dealer prior to stor-
age. However, the following procedures can
be performed by the owner.
EJU01813
Flushing the cooling system
Flushing the cooling system is essential
to prevent the cooling system from being
clogged with salt, sand, or dirt.
CAUTION:@
Do not supply water to the cooling
water passages when the engine is not
running. The water could flow back
through the muffler into the crankcase
causing severe engine damage.

Do not run the engine for more 15 sec-
onds without supplying water, other-
wise the engine may overheat.
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4-2
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1. Put the watercraft on land in a horizontal
position.
2. Remove the rear seat and seat storage
compartment. (See page 2-5 for seat
removal and installation procedures.)
3. Open the flushing hose connector cap1,
and then insert the garden hose adapter2
into the flushing hose connector3 and
turn it until it is securely connected.
4. Connect the garden hose adapter to a
water tap using a hose.
5. Start the engine, and then immediately
turn the water supply on until water flows
out continually from the jet nozzle.
6. Run the engine at idling speed for about
3 minutes watching the engine condition.
If the engine stops while flushing, turn
the water supply off immediately and
repeat the above steps.
7. Turn the water supply off, and then force
the remaining water out from the cooling
passages by alternately squeezing and
releasing the throttle lever for 10 to
15 seconds.
8. Stop the engine.
9. Remove the garden hose adapter and
secure the cap.
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EJU01898
Lubrication
WARNING@ Do not spray flammable rust inhibitor
products on engine surfaces while the
engine is hot. The sprayed substance or
propellants could catch fire.
@
1. Remove the rear and front seats. (See
pages 2-5 to 2-6 for seat removal and
installation procedures.)
2. Remove the air filter case cover
screws1, slide the locks 2 open, and
then remove the case cover.
3. Remove the air filter case cover and air
filter element.
4. Spray a rust inhibitor into each intake
opening 3 for 3 seconds.
5. Install the air filter element and air filter
case cover.
6. Start the engine in a well-ventilated area
and let it run at idle for 15 seconds.
CAUTION:@ Do not run the engine for more than
15 seconds. The engine could overheat.
@
7. Lubricate all cables such as the throttle
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
cables.
@
8. Lubricate the areas of the watercraft
specified under Lubrication points on
page 4-18.
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Fuel system
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 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 reaches approx-
imately 50 mm (2 in) from the top of the
fuel tank. Fuel expands as it warms up
and could overflow if the fuel tank has
been overfilled. If temporarily leaving
the watercraft with a full fuel tank, do
not leave it in direct sunlight. Leave it
in a well-ventilated area with the water-
craft in a horizontal position.

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.
@
Top off the fuel tank with fresh gasoline
and add fuel stabilizer and conditioner to the
fuel tank by following the manufacturer’s
instructions carefully.
UF1B71.book Page 4 Tuesday, November 12, 2002 4:17 PM