fuel YAMAHA VX 2008 User Guide
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Page 45 of 94
Operation
38
EJU31820
Fuel and oil
This watercraft is equipped with a 4-stroke en-
gine. Conventional 2-stroke engine oil cannot
be used.
The engine utilizes an electronic fuel injection
system to deliver the optimal air-fuel ratio re-
quired by the engine. By ensuring the optimal
combustion conditions, this system is able to
increase startability and improve fuel econo-
my.
EJU31841Gasoline
WARNING
EWJ00280
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 reaches approxi-
mately 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 watercraft
in a horizontal position.
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-
line in your eyes, get immediate medical
attention.
If any gasoline spills on your skin or
clothing, immediately wash the affected
area with soap and water and change
your clothes.
CAUTION:
ECJ00310
Use only fresh gasoline that has been
stored in clean containers.
EJU31860Gasohol
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.
Gasohol containing methanol is not recom-
mended by Yamaha because it can cause
fuel system damage and engine performance
problems.Recommended gasoline:
Regular unleaded gasoline with a mini-
mum octane rating of
86 (Pump octane number) = (R +
M)/2
90 (Research octane number)
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Page 46 of 94
Operation
39
EJU31890Engine oil
Use a combination of the recommended SAE
and API engine oil classifications shown in the
chart below.
CAUTION:
ECJ00280
Use only 4-stroke engine oil.
EJU31931Filling the fuel tank
CAUTION:
ECJ00290
Be careful when refueling. Avoid getting
water and other contaminants in the fuel
tank. Contaminated fuel can cause poor
running and engine damage.
(1) Remove the seat. (See page 23 for seat
removal and installation procedures.)
(2) Remove the fuel tank filler cap, and then
slowly add fuel to the fuel tank. Stop filling
when the fuel level reaches approximate-ly 50 mm (2 in) from the top of the fuel
tank as indicated in the illustration.
(3) Install the fuel tank filler cap and the seat.
1Approximately 50 mm (2 in) from top of the
fuel tank
Fuel tank capacity:
60 L (15.9 US gal) (13.2 Imp.gal)
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Page 47 of 94
Operation
40
EJU31980
Pre-operation checks EJU31990Pre-operation check list
Before operating this watercraft, perform the checks in the following check list. See the accom-
panying text in this chapter for details on how to perform the checks.
WARNING
EWJ00410
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.
ITEM ROUTINE PAGE
BEFORE LAUNCH OR OPERATION
Engine compartmentRemove the seat to ventilate the engine compart-
ment. Check for fuel vapors and loose electrical con-
nections.42
BilgeCheck for water and fuel and drain if necessary. 43
Stern drain plugsCheck for proper installation. 44
Throttle leverCheck that the throttle lever springs back smoothly. 45
Steering systemCheck for proper operation. 45
Shift lever and reverse gate
(VX Deluxe/VX Cruiser)Check for proper operation. 46
Fuel and oilCheck the fuel and oil levels and replenish if neces-
sary.
Check the hoses and tanks for leakage.42, 42
Water separatorCheck for water and drain if necessary. 43
BatteryCheck the electrolyte level and battery condition. 44
HoodCheck that the hood is securely closed. 23
SeatCheck that the seat is securely installed. 23
Hull and deckCheck the hull and deck for cracks and other dam-
age.42
Jet intakeCheck for debris and remove if necessary. 47
Fire extinguisherCheck the condition and replace if necessary. 45
Engine shut-off cordCheck the condition and replace if frayed or broken. 47
SwitchesCheck the start switch, engine stop switch, and en-
gine shut-off switch for proper operation.48
AFTER LAUNCH
Cooling water pilot outletCheck that water is discharged while the engine is
running and the watercraft is in the water.48
Multifunction information
centerCheck for warning indications and proper operation. 48
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Page 49 of 94
Operation
42
EJU32280Pre-operation check points EJU32310Engine compartment
Ventilate the engine compartment before
each use.
To ventilate the engine compartment, remove
the seat. (See page 23 for seat 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.
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.
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.
EJU32390Fuel level
Check the fuel system for leakage, cracks,
and malfunctions before each use. (See page
70 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 seat. (See page 23 for seat
removal and installation procedures.)
(3) Check the fuel level in the fuel tank and
replenish if necessary. (See page 39 for
filling procedures.)
(4) Install the fuel tank filler cap and the seat.
EJU32400Engine oil level
Check the engine oil level before each use.
CAUTION:
ECJ00390
When checking the engine oil level on
water, be careful of other watercraft,
boats, swimmers, and obstacles. The
water current and wind can cause the
watercraft to move and lead to a colli-
sion.
When checking the engine oil level on
land, supply water to the cooling water
passages. (See page 63 for procedures
on supplying water.)
Make sure that the engine has enough
oil, but do not overfill it. If there is too lit-
tle oil, the engine can be damaged. If
there is too much oil, the air filter can be-
come saturated with oil, permanently
damaging the filter and reducing engine
performance. Follow the checking pro-
cedure carefully.
Make sure that debris and water do not
enter the oil tank filler hole. Debris and
water in the engine oil can cause serious
engine damage.
To check the engine oil level:
(1) Place the watercraft in a horizontal posi-
tion or launch the watercraft, and then
start the engine.
(2) Run the engine at trolling speed for 6 min-
utes or more, and then stop the engine.
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Page 50 of 94
Operation
43
NOTE:
If the ambient temperature is 20 °C (68 °F) or
less, warm up the engine for an additional 5
minutes.
(3) Remove the seat. (See page 23 for seat
removal and installation procedures.)
(4) Remove the oil tank filler cap, wipe the
dipstick clean, and then screw the filler
cap into the filler hole completely. Re-
move the filler cap again and check that
the engine oil level is between the mini-
mum level mark and maximum level
mark on the dipstick.
(5) If the engine oil level is below the mini-
mum level mark, add enough oil so that
the oil level is between the minimum and
maximum level marks on the dipstick,and then install the filler cap. If the engine
oil level is significantly above the maxi-
mum level mark, the oil tank is overfilled.
Have a Yamaha dealer remove the ex-
cessive amount of engine oil.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
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.
EJU32460Bilge
Check the bilge for moisture and fuel residue.
CAUTION:
ECJ00370
Excessive water in the bilge can splash
into the engine, which can result in severe
damage.
1Oil tank filler cap
1Minimum level mark
2Maximum level mark
1Water separator
2Drain screw
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Page 70 of 94
Maintenance and care
63
EJU33490
Storage
WARNING
EWJ00330
Always place the watercraft upright in a
horizontal position when storing it, other-
wise fuel could leak out into the engine or
engine compartment, which could create a
fire hazard.
Storage for long periods of time, such as win-
ter storage, requires preventive maintenance
to ensure against deterioration. It is advisable
to have the watercraft serviced by a Yamaha
dealer prior to storage. However, the following
procedures can be performed by the owner.
EJU33542Flushing the cooling system
Flushing the cooling system is essential to
prevent it from clogging with salt, sand, or dirt.
CAUTION:
ECJ00121
Do not supply water to the cooling water
passages when the engine is not run-
ning. The water could flow back through
the muffler into the crankcase, causing
severe engine damage.
Do not run the engine for more than 15
seconds without supplying water or
over 4000 r/min on land, otherwise the
engine could overheat.
(1) Place the watercraft in a horizontal posi-
tion.
(2) Remove the seat. (See page 23 for seat
removal and installation procedures.)
(3) Remove the flushing hose connector
cap, and then insert the garden hoseadapter into the flushing hose connector
and turn it until it is securely connected.
(4) Connect the garden hose adapter to a
water tap using a garden hose.
NOTE:
A garden hose is not included and must be
purchased separately.
(5) Start the engine, and then immediately
turn the water supply on until water flows
out continually from the jet thrust 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 of the cooling
1Flushing hose connector cap
2Garden hose adapter
3Flushing hose connector
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Page 71 of 94
Maintenance and care
64
water 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 in-
stall the flushing hose connector cap.
EJU33622Lubrication
WARNING
EWJ00260
Do not spray flammable rust inhibitor
products on engine surfaces while the en-
gine is hot. The sprayed substance or pro-
pellants could catch fire.
(1) Remove the seat. (See page 23 for seat
removal and installation procedures.)
(2) Loosen the clamp screw and disconnect
the air intake duct.(3) Spray a rust inhibitor into the intake open-
ing for 3 seconds.
(4) Connect the air intake duct and tighten
the clamp screw.
(5) Start the engine in a well-ventilated area
and let it run at idle for 15 seconds.
CAUTION:
ECJ00561
Do not run the engine for more than 15
seconds without supplying water, other-
wise the engine could overheat.
(6) 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 ca-
bles.
(7) Lubricate the areas of the watercraft
specified in “Lubrication points” on page
73.
EJU33670Fuel system
WARNING
EWJ00280
GASOLINE AND ITS VAPORS ARE HIGH-
LY FLAMMABLE AND EXPLOSIVE!
1Clamp screw
2Air intake duct
1Intake opening
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Page 72 of 94
Maintenance and care
65
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 reaches approxi-
mately 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 watercraft
in a horizontal position.
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-
line in your eyes, get immediate medical
attention.
If any gasoline spills on your skin or
clothing, immediately wash the affected
area with soap and water and change
your clothes.
Top off the fuel tank with fresh gasoline and
add fuel stabilizer and conditioner to the fuel
tank according to the manufacturer’s instruc-
tions.
EJU33680Battery
If the watercraft will not be used for more than
a month, remove the battery from the water-
craft and store it in a cool, dry place.(1) Disconnect the negative (–) battery lead
first, then the positive (+) battery lead and
breather hose, and then remove the bat-
tery from the watercraft.
(2) Clean the battery casing using fresh wa-
ter.
(3) If the battery terminals are dirty or corrod-
ed, clean them with a wire brush.
(4) Fully charge the battery.
(5) Apply Yamaha Marine Grease or
Yamaha Grease A to the battery termi-
nals, and then store the battery in a cool,
dry place.
(6) Check the battery at least once every 2
months and fully charge it if necessary.
CAUTION:
ECJ00100
Always keep the battery charged. Storing
a discharged battery can cause permanent
battery damage.
To check the condition of the battery, check
the specific gravity of the electrolyte or mea-
sure the voltage at both battery terminals.
Charge the battery if the voltage is less than
12 volts.
It is recommended to have a Yamaha dealer
check the specific gravity and charge the bat-
tery. If you maintain the battery yourself, be
sure to read and follow the instructions provid-
ed with the battery tester and charger you
use.
EJU33730Cleaning the watercraft
Clean the watercraft before storing it for a long
period.
(1) Wash down the hull, handlebars, and jet
unit with fresh water. Specific gravity (for reference):
1.28 at 20 °C (68 °F)
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Maintenance and care
68
EJU33821Periodic maintenance chart
The following chart gives general guidelines for periodic maintenance. However, maintenance
may need to be performed more frequently depending on your operating conditions.
This“” mark indicates maintenance that you may do yourself.
This“” mark indicates work to be done by a Yamaha dealer.
Item OperationInitial Thereafter every
Page 10
hours50
hours100
hours100
hours200
hours
6
months12
months12
months24
months
Spark plugsCheck, clean, adjust 72
Lubrication pointsLubricate 73
Fuel systemCheck 70
Fuel tankCheck, clean 70
Trolling speedCheck, adjust 76
Throttle shaftCheck—
Cooling water pas-
sagesFlush
*63
Water inlet strain-
erCheck, clean—
Bilge strainerClean—
ImpellerCheck—
Jet thrust nozzle
angleCheck, adjust 71
Shift cable and re-
verse gate
(VX Deluxe/VX
Cruiser)Check, adjust 71
Throttle cableCheck, adjust 72
Stern drain plugsCheck, replace 44
BatteryCheck, charge 74
Rubber couplingCheck—
Engine mountCheck—
Nuts and boltsCheck—
Air filter elementCheck 71
Engine oilReplace 70
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Maintenance and care
70
EJU34210Checking the fuel system
WARNING
EWJ00380
Gasoline is highly flammable and explo-
sive. Failure to check for and repair any
fuel leakage could result in a fire or explo-
sion. A fire or explosion can cause severe
injury or death. Shut the engine off. Do not
smoke. Avoid spilling gasoline.
Fuel in the fuel lines is pressurized.
Fuel can spray out and cause injury or a
fire hazard if a fuel line is disconnected.
Do not run the engine with a fuel line dis-
connected.
Check the fuel system for leaks, cracks, and
malfunctions. If any problem is found, consult
a Yamaha dealer.
Check:
Fuel tank filler cap and seal for damage.
Fuel in fuel tank for water and dirt.
Fuel tank for damage, cracks, and leakage.
Fuel hoses and joints for damage, cracks,
and leakage.
Air bleeding passages for leakage.EJU34230Fuel tank
Check the fuel tank for leakage and for water
in the tank. If water is found in the fuel system,
or if the fuel tank needs to be cleaned, have a
Yamaha dealer service the watercraft.
EJU34291Engine oil and oil filter
WARNING
EWJ00340
Engine oil is extremely hot immediately af-
ter the engine is turned off. Coming in con-
tact with or getting any engine oil on your
clothes could result in burns.
CAUTION:
ECJ00180
Do not run the engine with too much or
not enough oil in the oil tank. Oil could
spray out and the engine could be dam-
aged.
Be sure to change the engine oil after
the first 10 hours of operation, and every
100 hours thereafter or at the start of a
new season, otherwise the engine will
wear quickly.
The oil filter should be replaced every
year or every 100 hours of operation.
Have a Yamaha dealer replace the oil fil-
ter if necessary.
It is recommended to have a Yamaha dealer
change the engine oil. However, if you choose
to change the oil on your own, consult a
Yamaha dealer.
NOTE:
Dispose of used oil according to local regula-
tions.
1Fuel tank
Recommended engine oil:
SAE 10W-30, 20W-40, 20W-50
Oil grade:
API SE,SF,SG,SH,SJ,SL
Oil quantity:
With oil filter replacement:
2.2 L (2.33 US qt) (1.94 Imp.qt)
Without oil filter replacement:
2.0 L (2.11 US qt) (1.76 Imp.qt)
Total amount:
4.3 L (4.55 US qt) (3.78 Imp.qt)
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