2010 YAMAHA VX engine

Description
19
EJU40302
Watercraft glossary
Trolling speed
“Trolling” is the lowest maneuvering speed. You are applying little or no throttle. The watercraft
is down in the water, and there is no wake.
Sub-planing speed
“Sub-planing” is a medium speed. The bow of the watercraft is slightly up from the water sur-
face, but you are still traveling through the water. There is a wake.
Planing speed
“Planing” is a faster speed. The watercraft is more level and is skimming on top of the water.
There is a wake.
Bow
The front end of the watercraft.
Stern
The rear end of the watercraft.
Starboard
The right side of the watercraft when facing forward.
Port
The left side of the watercraft when facing forward.
Bilge water
Water that has collected in the engine compartment.
Yamaha Engine Management System (YEMS)
YEMS is an integrated, computerized management system that controls and adjusts ignition
timing, fuel injection, engine diagnostics, and the off-throttle steering (OTS) system.
UF2N70E0.book Page 19 Tuesday, October 6, 2009 9:57 AM

Description
22
5
4 1
23
10
1112 7
68
9
1Start switch (page 26)
2Engine shut-off switch (page 26)
3Clip (page 26)
4Engine shut-off cord (lanyard) (page 26)
5Engine stop switch (page 26)
6Glove compartment (page 40)
7Multifunction information center (page 32)
8Rearview mirror
9Remote control transmitter (VX Deluxe /
VX Cruiser) (page 24)
10Beverage holder (VX Deluxe / VX Cruiser)
(page 41)
11Shift lever (VX Deluxe / VX Cruiser) (page
29)
12Throttle lever (page 27)
UF2N70E0.book Page 22 Tuesday, October 6, 2009 9:57 AM

Description
23
Engine compartment
6
789
12
345
1Water separator (page 28)
2Fuel tank
3Air filter case
4Battery (page 52)
5Flushing hose connector
6Electrical box
7Spark plug/Spark plug cap/Ignition coil
8Oil tank filler cap/Dipstick
9Oil tank
UF2N70E0.book Page 23 Tuesday, October 6, 2009 9:57 AM

Control function operation
25
EJU31384Yamaha Security System (VX Deluxe /
VX Cruiser)
The Yamaha Security System functions to
help prevent unauthorized use or theft of the
watercraft. The lock and unlock modes of the
security system can be selected by operating
the remote control transmitter that is included
with this watercraft. The engine cannot be
started if the lock mode of the security system
is selected. The engine can only be started if
the unlock mode is selected. (See page 24 for
information on the remote control transmitter.)
TIP:
The Yamaha Security System settings can
only be selected while the engine is stopped.
EJU36106Yamaha Security System settings
The Yamaha Security System settings will be
confirmed by the number of beeps when the
remote control transmitter is operated, and by
the “SECURITY” indicator light of the multi-
function information center. (See page 32 for
information on the multifunction information
center.)
TIP:

The beeper sounds two times for the nor-
mal operation mode or three times for the
Low RPM Mode. (See page 30 for Low
RPM Mode activation procedures.)

If the remote control transmitter is operated
while the multifunction information center is
in the standby state, the center will performthe initial operation, and then the setting is
selected.
To select the lock mode:
Push the lock button on the remote control
transmitter briefly. The beeper sounds once
and the “SECURITY” indicator light blinks
once, then goes off. This indicates the lock
mode is selected.
To select the unlock mode:
Push the “L-Mode” (unlock) button on the re-
mote control transmitter briefly. The beeper
sounds two or three times and the “SECURI-
TY” indicator light blinks two or three times,
then comes on. This indicates the unlock
mode is selected.
Number of
beepsYamaha Security
System mode“SECURI-
TY” indi-
cator light
Lock Goes off
Unlock
(normal operation
mode)Comes
on
Unlock
(Low RPM Mode)Comes
on
1Lock button
2“SECURITY” indicator light
1“L-Mode” (unlock) button
2“SECURITY” indicator light
21
2L-Mode1
UF2N70E0.book Page 25 Tuesday, October 6, 2009 9:57 AM

Control function operation
26
EJU31152Engine stop switch “ ”
The engine stop switch (red button) stops the
engine when the switch is pushed.
EJU31163Engine shut-off switch “ ”
The engine shut-off switch automatically
stops the engine when the clip, on the end of
the engine shut-off cord (lanyard), is removed
from the switch, such as if the operator falls off
the watercraft.
Insert the clip under the engine shut-off switch
before starting the engine.
When the engine is not running, remove the
clip from the engine shut-off switch to preventaccidental starting or unauthorized operation
by children or others.
EJU41650Start switch “ ”
NOTICE
ECJ01310
Do not run the engine over 4000 r/min on
land. Also, do not run the engine for more
than 15 seconds without supplying water,
otherwise the engine could overheat.
The start switch (green button) starts the en-
gine when the switch is pushed.
Release the start switch as soon as the en-
gine starts to run. If the engine does not start
in 5 seconds, release the start switch, wait 15
seconds, and then try again. NOTICE: Never
push the start switch while the engine is
running. Do not operate the start switch
for more than 5 seconds, otherwise the
battery will be discharged and the engine
1Engine stop switch
1Engine shut-off switch
2Clip
3Engine shut-off cord (lanyard)
1
STOP
312
chapter4 Page 26 Friday, October 9, 2009 2:42 PM

Control function operation
27
will not start. Also, the starter motor could
be damaged.
[ECJ01040]
The engine will not start under any of the fol-
lowing conditions:

Clip is removed from the engine shut-off
switch.

Throttle lever is squeezed.

VX Deluxe / VX Cruiser: Lock mode of the
Yamaha Security System has been select-
ed. (See page 25 for Yamaha Security Sys-
tem setting procedures.)
EJU31211Throttle lever
The throttle lever increases the engine speed
when the lever is squeezed.
The throttle lever returns automatically to its
fully closed (idle) position when released.
EJU31261Steering system
By turning the handlebars in the direction you
wish to travel, the angle of the jet thrust nozzle
is changed, and the direction 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.
This model is equipped with the Yamaha En-
gine Management System (YEMS) that in-
cludes an off-throttle steering (OTS) system.
It will activate at planing speeds should you
attempt to steer the watercraft after releasing
the throttle lever. The OTS system assists in
turning by continuing to supply some thrust
while the watercraft is decelerating, but you
can turn more sharply if you apply throttle
while turning the handlebars. The OTS sys-
tem does not function below planing speeds
or when the engine is off. Once the engine
slows down, the watercraft will no longer turn
1Start switch
1Throttle lever
START
1
1
1Handlebar
2Jet thrust nozzle
2
1
UF2N70E0.book Page 27 Tuesday, October 6, 2009 9:57 AM

Control function operation
28
in response to handlebar input until you apply
throttle again or you reach trolling speed.
EJU35974Cooling water pilot outlet
When the engine is running, some of the cool-
ing water that is circulated in the engine is dis-
charged from the cooling water pilot outlet.
There is a cooling water pilot outlet on the port
(left) side of the watercraft. To check for prop-
er operation of the cooling system, make sure
that water is being discharged from the cool-
ing water pilot outlet. If water is not being dis-
charged from the outlet, stop the engine and
check the jet intake for clogging. (See page
83 for information on the jet intake.)
TIP:

It will take about 60 seconds for the water to
reach the outlet after the engine is started.

Water discharge may not be constant when
the engine is running at idling speed. If this
occurs, apply a little throttle to make sure
that water discharges properly.
EJU40322Water separator
The water separator prevents water from en-
tering the fuel tank by collecting any water that
has entered the fuel tank breather hose if the
watercraft was capsized.If water has collected in the water separator,
drain it by loosening the drain screw.
To drain water from the water separator:
(1) Place a drain pan or dry cloth under the
water separator.
(2) Gradually loosen the drain screw to drain
the water. Catch the draining water in the
drain pan or soak it up with the dry cloth
so that it does not spill into the engine
compartment. If any water spills into the
watercraft, be sure to wipe it up with a dry
cloth.
(3) Securely tighten the drain screw until it
stops.
1Cooling water pilot outlet
1
1Water separator
1Drain screw
1
1
UF2N70E0.book Page 28 Tuesday, October 6, 2009 9:57 AM

Watercraft operation
30
EJU40000
Watercraft operation modes
EJU31417Low RPM Mode (VX Deluxe /
VX Cruiser)
The Low RPM Mode is a function that limits
the maximum engine speed to approximately
90% of the maximum engine speed in the nor-
mal mode.
The Low RPM Mode can only be activated
and deactivated by operating the remote con-
trol transmitter that is included with this water-
craft. (See page 24 for information on the
remote control transmitter.)
TIP:
The Low RPM Mode can only be activated
when the engine is stopped in the unlock
mode of the Yamaha Security System.
Activating and deactivating the Low RPM
Mode
Activation of the Low RPM Mode will be con-
firmed by the number of beeps when the re-
mote control transmitter is operated, and by
the “L-MODE” indicator light of the multifunc-
tion information center. (See page 32 for infor-
mation on the multifunction information
center.)
TIP:
If the remote control transmitter is operated
while the multifunction information center is in
the standby state, the center performs the ini-
tial operation, and then the setting is selected.
To activate the Low RPM Mode:
Push the “L-Mode” (unlock) button on the re-
mote control transmitter for more than 4 sec-
onds. Once the beeper sounds three times
and the “SECURITY” indicator light blinks
three times, then comes on, the “L-MODE” in-
dicator light comes on and the Low RPM
Mode is activated.
TIP:
If the Low RPM Mode is activated immediate-
ly after the information display turns off, the
“L-MODE” indicator light will not come on. The
1Remote control transmitter
Number of
beepsLow RPM Mode
operation“L-
MODE”
indicator
light
ActivatedComes
on
Deactivated Goes off
UF2N70E0.book Page 30 Tuesday, October 6, 2009 9:57 AM