engine YAMAHA VX DELUXE 2007 Workshop Manual

Maintenance and care
75
If the reverse gate does not make contact with
the stopper, have a Yamaha dealer service it.
EJU34360Checking and adjusting the throttle
cable
Check that the throttle cable moves back to
the set position smoothly and that the throttle
lever free play is within specification.
(1) Squeeze and release the throttle lever. If
the throttle lever does not return smooth-
ly, have a Yamaha dealer service it.
(2) Adjust the free play by loosening the lock-
nut and turning the adjuster.
EJU34391Cleaning and adjusting the spark
plugs
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate something about
the condition of the engine. For example, if
one spark plug has a distinctly different color,
the engine could require servicing. Do not at-
tempt to diagnose any problems yourself.
Have a Yamaha dealer service the watercraft.
Remove and inspect the spark plugs periodi-
cally; heat and deposits will cause the sparkplugs to slowly break down and erode. If elec-
trode erosion becomes excessive, or if carbon
and other deposits are excessive, replace the
spark plug with the specified plug.
To remove a spark plug:
(1) Remove the seat. (See page 26 for seat
removal and installation procedures.)
(2) Remove the spark plug cap.
CAUTION:
ECJ00210
Do not use any tools to remove or install
the spark plug cap, otherwise the ignition
coil coupler could be damaged. The spark
plug cap may be difficult to remove be-
cause the rubber seal on the end of the
cap fits tightly. To remove the spark plug
cap, simply twist it back and forth while
pulling it up; to install it, twist it back and
forth while pushing it down.
(3) Remove the spark plug.
Measure the spark plug gap with a wire
thickness gauge. Replace the spark plug
or adjust the gap to specification if neces-
sary.1Locknut
2Adjuster
3Throttle lever free play
Throttle lever free play:
4.0–7.0 mm (0.16–0.28 in)
Specified spark plug:
CR9EB
1Spark plug gap
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
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Maintenance and care
78
(1) Remove all of the battery caps.
(2) If the electrolyte level is low, add distilled
water to raise it to the specified level.
(3) Set the charging rate to 1.9 ampere and
charge the battery slowly until the explo-
sive gases are discharged vigorously
from the battery cells.
To install the battery:
(1) Place the battery in the battery compart-
ment and connect the battery leads to the
battery terminals.
(2) Connect the breather hose to the battery.
(3) Secure the battery in place.
WARNING
EWJ00400
Be sure to connect the breather hose to
the battery. Fire or explosion could result
if the breather hose is damaged, obstruct-
ed, or not connected properly.
CAUTION:
ECJ00260
After installation, make sure that the bat-
tery leads are properly connected to the
battery terminals.
EJU34490Fuel injection system
The fuel injection system was set at the
Yamaha factory. If the fuel injection systemneeds to be adjusted, have a Yamaha dealer
service the watercraft.
CAUTION:
ECJ00220
Do not attempt to adjust the fuel injection
system. If the settings are disturbed by
someone who does not have the neces-
sary technical knowledge, poor engine
performance and damage may result.
EJU34500Checking the trolling speed
(1) Place the watercraft in the water.
(2) Start the engine and warm it up. Use the
tachometer in the multifunction informa-
tion center to check the trolling speed.
If the trolling speed is out of specification,
have a Yamaha dealer service the watercraft.
1Positive (+) battery terminal: Red lead
2Negative (–) battery terminal: Black lead
3Breather hose
Trolling speed:
1650 ±50 r/min
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Specifications
79
EJU34541
Specifications
Watercraft capacity:
Maximum people on board:
3 person
Maximum load capacity:
240 kg (530 lb)
Dimensions:
Length:
3220 mm (126.8 in)
Width:
1170 mm (46.1 in)
Height:
1150 mm (45.3 in)
Dry weight:
VX 319 kg (703 lb)
VX Deluxe 322 kg (710 lb)
VX Cruiser 323 kg (712 lb)
Performance:
Maximum output (according to ISO 8665/SAE
J1228):
75.0 kW@8000 r/min
Maximum fuel consumption:
28.0 L/h (7.4 US gal/h) (6.2 Imp.gal/h)
Cruising range at full throttle:
2.14 hour
Trolling speed:
1650 ±50 r/min
Engine:
Engine type:
Liquid cooled 4-stroke, DOHC
Number of cylinders:
4
Engine displacement:
1052 cm³
Bore & stroke:
76.0 × 58.0 mm (2.99 × 2.28 in)
Compression ratio:
11.4 :1
Valve clearance-intake (cold):
0.11–0.20 mm (0.0043–0.0079 in)
Valve clearance-exhaust (cold):
0.25–0.34 mm (0.0098–0.0134 in)
Lubrication system:
Dry sump
Cooling system:
Water
Starting system:
ElectricIgnition system:
T.C.I.
Spark plug:
CR9EB
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Battery capacity:
12 V, 19.0 Ah
Charging system:
Flywheel magneto
Drive unit:
Propulsion system:
Jet pump
Jet pump type:
Axial flow, single stage
Impeller rotation:
Counterclockwise
Jet thrust nozzle angle:
24.0+24.0 °
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Minimum octane rating (PON):
86
Minimum octane rating (RON):
90
Recommended oil:
SAE 10W-30, 20W-40, 20W-50
Oil grade:
API SE,SF,SG,SH,SJ,SL
Fuel tank total capacity:
60 L (15.9 US gal) (13.2 Imp.gal)
Engine oil quantity with oil filter replacement:
2.2 L (2.33 US qt) (1.94 Imp.qt)
Engine oil quantity without oil filter replacement:
2.0 L (2.11 US qt) (1.76 Imp.qt)
Engine oil total quantity:
4.3 L (4.55 US qt) (3.78 Imp.qt)
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Trouble recovery
80
EJU34560
Troubleshooting
If you have any trouble with your watercraft, use this section to check for the possible cause.
If you cannot find the cause, or if the procedure for replacement or repair is not described in
this owner’s/operator’s manual, have a Yamaha dealer perform the necessary service.
EJU34591Troubleshooting chart
TROUBLE POSSIBLE CAUSE REMEDY PAGE
Engine does not
start (Starter motor
does not turn over)Yamaha Se-
curity Sys-
tem (VX
Deluxe/VX
Cruiser)Lock mode selected Select unlock mode
32
Engine shut-
off switchClip not in place Install clip
28
Fuse Burned out Replace the fuse and
check wiring84
Battery Run down Recharge 77
Poor terminal con-
nectionsTighten as required
77
Terminal corroded Clean 68
Starter motor Faulty Have serviced by
Yamaha dealer—
Engine does not
start (Starter motor
turns over)Throttle lever Squeezed Release 29
Fuel Empty Refill as soon as pos-
sible42
Stale or contaminat-
edHave serviced by
Yamaha dealer73
Fuel tank Water or dirt present Have serviced by
Yamaha dealer73
Spark plug Fouled or defective Clean or replace 75
Spark plug
capNot connected or
looseConnect properly
75
Connected to wrong
cylinderConnect properly
75
Fuel injec-
tion systemFuel pump faulty Have serviced by
Yamaha dealer—
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Trouble recovery
81
Engine runs irregu-
larly or stallsFuel Empty Refill as soon as pos-
sible42
Stale or contaminat-
edHave serviced by
Yamaha dealer73
Fuel tank Water or dirt present Have serviced by
Yamaha dealer73
Spark plug Fouled or defective Replace 75
Incorrect heat range Replace 75
Gap incorrect Adjust 75
Spark plug
capLoose Connect properly 75
Cracked, torn, or
damagedReplace
—
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel injec-
tion systemFaulty or clogged in-
jectorsHave serviced by
Yamaha dealer—
Warning light or in-
dicator blinksFuel level Empty Refill as soon as pos-
sible42
Engine over-
heatedJet intake clogged Clean
82
Check engine
warningFaulty sensors Have serviced by
Yamaha dealer37
Watercraft slow or
loses powerYamaha Se-
curity Sys-
tem (VX
Deluxe/VX
Cruiser)Low-RPM mode se-
lectedSelect normal mode
33
Cavitation Jet intake clogged Clean 82
Impeller damaged or
wornHave serviced by
Yamaha dealer82
Engine over-
heat warningEngine speed reduc-
tion control activatedClean jet intake and
cool engine36
Oil pressure
warningEngine speed reduc-
tion control activatedAdd oil
35
Spark plug Fouled or defective Replace 75
Incorrect heat range Replace 75
Gap incorrect Adjust 75
Spark plug
capsLoose Connect properly
75
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel Stale or contaminat-
edHave serviced by
Yamaha dealer73
Air filter Clogged or oil buildup Have serviced by
Yamaha dealer74 TROUBLE POSSIBLE CAUSE REMEDY PAGE
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Trouble recovery
82
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.
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Trouble recovery
83
CAUTION:
ECJ00660

Place a suitable clean cloth or carpeting
underneath the watercraft to protect it
from abrasions and scratches.

Always turn the watercraft over onto its
port (left) side.

When turning the watercraft on its side,
support the bow so that the handlebars
are not bent or damaged.
(2) Remove any weeds or debris from
around the drive shaft, impeller, jet pump
housing, and jet thrust nozzle.
If debris is difficult to remove, consult a
Yamaha dealer.
CAUTION:
ECJ00670
Always avoid operating your watercraft in
areas where weed growth is thick. If travel-
ing in weeded areas is unavoidable, oper-
ate the engine alternately at partial throttle
and full throttle. Weeds tend to accumu-
late more at a steady speed and at trolling
speed. If weeds clog the jet intake or im-
peller area and cause cavitation, follow the
cleaning procedure above.
EJU34640Jumping the battery
If the watercraft battery has run down, the en-
gine can be started using a 12-volt booster
battery and jumper cables.
WARNING
EWJ00790
Battery electrolyte is poisonous and dan-
gerous, causing severe burns, etc. Elec-
trolyte contains sulfuric acid. Avoid
contact with skin, eyes, or clothing.
Antidotes
External: Flush with water.
Internal: Drink large quantities of water or
milk. Follow with milk of magnesia, beatenegg, or vegetable oil. Call a physician im-
mediately.
Eyes: Flush with water for 15 minutes and
get prompt medical attention.
Batteries produce explosive gases. Keep
sparks, flames, cigarettes, etc., well away.
If using or charging the battery in an en-
closed space, make sure that it is well ven-
tilated. Always shield your eyes when
working near batteries.
KEEP OUT OF THE REACH OF CHILDREN.
EJU34660Connecting the jumper cables
(1) Connect the positive (+) jumper cable to
the positive (+) battery terminals of both
batteries.
(2) Connect one end of the negative (–)
jumper cable to the negative (–) battery
terminal of the booster battery.
(3) Connect the other end of the negative (–)
jumper cable to an engine hanger.
CAUTION:
ECJ00680
Do not connect the end of the negative (–)
jumper cable to the negative (–) battery
terminal of the watercraft battery! Make
sure that all connections are secure and
correct before attempting to start the en-
1Positive (+) jumper cable
2Negative (–) jumper cable
3Booster battery
4Engine hanger
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Trouble recovery
84
gine. Any wrong connection could dam-
age the electrical system.
(4) Start the engine, and then disconnect the
jumper cables by reversing the steps
above.
CAUTION:
ECJ00690

Never push the start switch while the en-
gine is running.

Do not operate the start switch for more
than 5 seconds, otherwise the battery
will be discharged and the engine will
not start. Also, the starter motor could
be damaged. If the engine does not start
in 5 seconds, release the start switch,
wait 15 seconds, and then try again.
EJU34690Replacing the fuses
The fuses are located in the electrical box.
To replace a fuse:
(1) Remove the cap on the electrical box.(2) Replace the blown fuse with the spare
fuse of the correct amperage by using the
fuse puller on the reverse side of the cap.
1Electrical box
2Cap
3Fuse
4Spare fuse
1Fuse puller
Fuse amperage:
Battery fuse:
30 A
Main relay drive fuse:
10 A
Electronic throttle valve fuse:
10 A
Security system fuse:
3 A
Main fuse:
20 A
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Trouble recovery
85
WARNING
EWJ00800
Do not use fuses of higher amperage than
recommended. Substitution with a fuse
that has an improper rating can cause ex-
tensive electrical system damage and pos-
sible fire.
EJU34710Towing the watercraft
If the watercraft becomes inoperative in the
water, it can be towed to shore.
If the watercraft must be towed in an emer-
gency using a towline, the operator should
ride the watercraft, holding onto the handle-
bars.
CAUTION:
ECJ00720

Tow the watercraft at 5 mph (8 km/h) or
less, otherwise water could enter the en-
gine through the exhaust passages or
through the air intake and flood the en-
gine compartment if it is towed too fast.

Tow the watercraft using the bow eye
only.

The bow must be kept up out of the wa-
ter during towing to prevent water from
entering the engine compartment.
WARNING
EWJ00810

The watercraft should only be towed in
an emergency.

The towline should be long enough so
that the watercraft will not collide with
the towing boat when slowing down. A
good rule of thumb is a towline that is
three times the combined length of the
towing boat and the watercraft.

The operator of the towing boat must
keep speed to a minimum and avoid traf-
fic or obstacles which could be a hazard
to the rider on the watercraft.
EJU36150Submerged watercraft
If the watercraft is submerged or flooded with
water, follow the procedure below and consult
a Yamaha dealer as soon as possible. Failure
to do so could result in serious engine dam-
age!
In an emergency:
(1) Beach the watercraft and remove the
stern drain plugs to drain the water from
the engine compartment. (See page 46
for more information.) Remove the stor-
age compartment drain plugs to drain the
water from the storage compartments.
(2) Install the stern drain plugs and storage
compartment drain plugs.
(3) Disconnect the spark plug caps, and then
remove the spark plugs.
CAUTION:
ECJ00760
Do not connect the spark plugs to the
spark plug caps.
(4) Disconnect the fuel injector couplers.
CAUTION:
ECJ00770
Cover the disconnected fuel injector cou-
plers so that they do not get wet. If the cou-
1Bow eye
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Trouble recovery
86
plers get wet, they could corrode, which
could lead to poor connections.
(5) Crank the engine for 5 seconds at wide
open throttle. Repeat this step until all of
the water in the cylinders has been ex-
pelled.
(6) Spray a rust inhibitor into each spark plug
hole for 5 seconds.
(7) Crank the engine for 5 seconds at wide
open throttle. Repeat this step several
times.
(8) Install the spark plugs, and then connect
the spark plug caps and fuel injector cou-
plers.
CAUTION:
ECJ00780
Do not start the engine even after complet-
ing the previous steps. Any water remain-
ing in the engine could cause serious
engine damage.
(9) Have the watercraft inspected by a
Yamaha dealer as soon as possible.
CAUTION:
ECJ00790
Be sure to have a Yamaha dealer inspect
the watercraft. Otherwise, serious engine
damage could result.
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