engine YAMAHA VX 2021 Workshop Manual

Pre-operation checks
73
Turn the handlebars as far as possible to the
right and left to make sure that the jet thrust
nozzle moves as the handlebars are turned,
and that there is no difference between the
right and left fully turned positions of the jet
thrust nozzle.
EJU43213RiDE lever checks (VX / VX DELUXE /
VX CRUISER / VX LIMITED)
Operate the RiDE lever several times to make
sure that operation is smooth throughout the
whole range. Also, make sure that the RiDElever returns automatically to its fully closed
position when released.
EJU42181Throttle lever checks
Operate the throttle lever several times to
make sure that operation is smooth through-
out the whole range. Also, make sure that the
throttle lever returns automatically to its fully
closed (idle) position when released.
EJU45351Yamaha Security System check
(VX DELUXE / VX CRUISER / VX LIMITED)
Make sure that the Yamaha Security System
operates properly. (See page 25 for Yamaha
Security System setting procedures.)
EJU32664Engine shut-off cord (lanyard) check
Make sure that the engine shut-off cord (lan-
yard) is not damaged. If the cord is damaged,
replace it. WARNING! Never try to repair
the engine shut-off cord (lanyard) or tie it
together. The engine shut-off cord (lan-
yard) may not pull free when the operator
Difference between fully turned posi-
tions of jet thrust nozzle (distances A
and B):
Maximum 5 mm (0.20 in)
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Pre-operation checks
74
falls off, allowing the watercraft to contin-
ue to run and cause an accident.
[EWJ01221]
EJU46231
Switch checksECJ01311
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.
VX-C:
Check the start switch, the engine stop
switch, and the engine shut-off switch for
proper operation. (See pages 26 to 27 for in-
formation on operating each switch.) VX / VX DELUXE / VX CRUISER / VX
LIMITED:
Check the engine start/stop switch and the
engine shut-off switch for proper operation.
(See page 26 for information on operating
each switch.)
To check the operation of the switches (VX-C):
(1) Push the start switch to make sure that
the engine starts.
(2) As soon as the engine starts running, push the engine stop switch to make
sure that the engine stops immediately.
(3) Restart the engine, and then pull the en- gine shut-off cord (lanyard) to remove
the clip from the engine shut-off switch
to make sure that the engine stops im-
mediately.
1Engine shut-off switch
2 Clip
3 Start switch
4 Engine stop switch
5 Engine shut-off cord (lanyard)
123
4 5
1 Clip
2 Engine shut-off switch
3 Engine shut-off cord (lanyard)
1 Engine start/stop switch
12
3
1
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Pre-operation checks
75
To check the operation of the switches (VX /
VX DELUXE / VX CRUISER / VX LIMITED):
(1) VX DELUXE / VX CRUISER / VXLIMITED: If the lock mode is selected forthe Yamaha Security System setting, se-
lect the unlock mode. (See page 25 for
Yamaha Security System setting proce- dures.)
(2) Push the engine start/stop switch to make sure that the engine starts.
(3) As soon as the engine starts running, push the engine start/stop switch to
make sure that the engine stops immedi-
ately.
(4) Restart the engine, and then pull the en- gine shut-off cord (lanyard) to remove
the clip from the engine shut-off switch
to make sure that the engine stops im-
mediately.
EJU40102Storage compartment checks
Make sure that the storage compartments
are not damaged and that water has not col-
lected in the compartments. (See page 57 for
information on the storage compartments.)
EJU43800Fire extinguisher holder, cover, and band
checks
Make sure that the fire extinguisher holder,
cover, and band are not damaged and that
the fire extinguisher is securely held in place
using the band. (See page 60 for information
on the fire extinguisher holder, cover, and
band.)
EJU32544Fire extinguisher check
Check that there is a full fire extinguisher on
board.
To check the fire extinguisher, see the in-
structions supplied by the fire extinguisher
manufacturer. Always keep the fire extin-
guisher secured in the holder with its cover in
place.
Always carry a fire extinguisher on board. A
fire extinguisher is not standard equipment
with this watercraft. If you do not have one,
contact a Yamaha dealer or a fire extinguish-
er dealer to obtain one meeting the proper
specifications.
EJU40122Safety equipment check
Check that safety equipment meeting the ap-
plicable regulations is on board.
EJU32353Hull and deck check
Check the hull and deck for damage or other
problem.
EJU32657Jet intake checks
Make sure that the jet intake is not damaged
or clogged with weeds or debris. If the jet in-
take is clogged, clean it. (See page 107 for in-
formation on the jet intake.)
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Pre-operation checks
76
EJU43221Jet thrust nozzle and reverse gate check
(VX / VX DELUXE / VX CRUISER / VX
LIMITED) Check the jet thrust nozzle and reverse gate
for damage or other problem.
EJU44250Stern drain plug checks
Loosen the stern drain plugs and remove
them, and then make sure that the plugs and
O-rings on the plugs are not damaged and
that there is no foreign material on the
threads or O-rings on the plugs. NOTICE:
Before installing the stern drain plugs,
clean the drain plug threads and the O-
rings on the plugs to remove any foreign
materials, such as dirt or sand. Otherwise,
the stern drain plugs could be damaged,
allowing water to enter the engine com-
partment. Check the O-rings on the stern
drain plugs and make sure that the plugs
are tightened securely before launching
the watercraft. Otherwise, water may
flood the engine compartment and cause
the watercraft to submerge.
[ECJ00363]
Securely install the stern drain plugs by tight-
ening them until they stop.
EJU41441Hood check
Push down on the rear of the hood and make
sure that it is securely closed.
EJU40146Post-launch checks
Perform the post-launch checks in the pre-
operation checklist while the watercraft is in
the water and the engine is running.
To perform the post-launch checks:
(1) Launch the watercraft. (See page 79 for information on launching the watercraft.)
(2) Perform the checks and make sure that there are no malfunctioning items or oth-
er problems.
1Stern drain plug
2 O-ring
2
1
1Stern drain plug
1
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Pre-operation checks
77
EJU40553Cooling water pilot outlet check
Make sure that water is discharged from the
cooling water pilot outlet while the engine is
running. (See page 28 for information on the
cooling water pilot outlet.)
EJU46240Multifunction information center check
Make sure that the multifunction information
center operates properly. (See page 39, 44
for information on proper operation of the
multifunction information center.)
EJU43393Shift system check (VX / VX DELUXE /
VX CRUISER / VX LIMITED)
Operate the throttle lever and RiDE lever, and
check that the watercraft moves or does not
move according to the displayed shift indica-
tor. (See page 30 for shift system operation
procedures.) WARNING! To avoid colli-
sions, operate at safe speeds and keep a safe distance away from people, objects,
and other watercraft.
[EWJ01860]
VX
VX DELUXE / VX CRUISER / VX LIMITED
EJU40172Engine idling speed check
Start the engine and warm it up. Use the ta-
chometer in the multifunction information
center to make sure that the engine idling
speed is not significantly above or below the
specified range.
1
Shift indicator
2 “F” (Forward position)
3 “N” (Neutral position)
4 “R” (Reverse position)
1 Shift indicator
2 “F” (Forward position)
3 “N” (Neutral position)
4 “R” (Reverse position)
Engine idling speed:
1500 ±100 r/min
12
3
4
14.3V
km/h
RPM
1
2
3
4
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Operation
79
EJU40212Riding position
Operator riding position
The operator should grip the handlebars firm-
ly with both hands and sit astride the seat
with both feet on the floor of the footwell.
Passenger riding position
The passenger(s) should hold on firmly, either
to the person in front of them or to the hand-
grip provided, and sit astride the seat with
their feet on the floor of the footwell. Never al-
low a passenger to ride in front of the opera-
tor. (See page 17 for information on the riding
position when pulling a wakeboarder or wa-
ter-skier.)
EJU32803Launching the watercraft
When launching the watercraft, make sure
that there are no obstacles around you.
If the watercraft is launched from a trailer,
someone should make sure that waves do
not push the watercraft into the trailer.
EJU46250Starting the engine on waterEWJ01531
Do not apply throttle when anyone is at the
rear of the watercraft. Turn the engine off
or keep it at idle. Water and debris exiting
the jet thrust nozzle can cause severe in-
jury.
To start the engine:
(1) VX DELUXE / VX CRUISER / VXLIMITED: If the lock mode is selected forthe Yamaha Security System setting, se-
lect the unlock mode. (See page 25 for
Yamaha Security System setting proce- dures.)
(2) Move the watercraft to an area that is free from weeds and debris, and has a
water depth of at least 60 cm (2 ft) from
the bottom of the watercraft. NOTICE:
Never run the engine in water that is
less than 60 cm (2 ft) deep from the
bottom of the watercraft, otherwise
pebbles or sand could be sucked into
the jet intake, causing impeller dam-
age and engine overheating.
[ECJ00473]
(3) Attach the engine shut-off cord (lanyard) to your left wrist, and then attach the clip
to the engine shut-off switch. (See page
26 for information on operating the en-
gine shut-off switch.) WARNING! Check
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Operation
80
that the engine shut-off cord (lanyard)
is attached correctly. If the engine
shut-off cord (lanyard) is not attached
correctly, it may not pull free when the
operator falls off, allowing the water-
craft to continue to run and cause an
accident.
[EWJ00582]
(4) VX-C: With the throttle lever released,push the start switch (green button) to
start the engine. (See page 27 for infor-
mation on operating the start switch.)
VX / VX DELUXE / VX CRUISER / VX
LIMITED: With the throttle lever released, push the engine start/stop switch (red
button) to start the engine. (See page 26 for information on operating the engine
start/stop switch.)
EJU46260Stopping the engine
Release the throttle lever, and then push the
engine stop switch (red button) (VX-C) or the
engine start/stop switch (red button) (VX /
VX DELUXE / VX CRUISER / VX LIMITED) to
stop the engine.
WARNING! You need
throttle to steer. Shutting the engine off
can cause you to hit an obstacle you are
1 Clip
2 Engine shut-off switch
3 Engine shut-off cord (lanyard)
12
3
START
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Operation
81
attempting to avoid. A collision could re-
sult in severe injury or death.
[EWJ00602]
VX-C
VX / VX DELUXE / VX CRUISER / VX
LIMITED
EJU32873Leaving the watercraft
If leaving the watercraft, remove the clip from
the engine shut-off switch to prevent acci-
dental starting or unauthorized operation by
children or others.
EJU44991Operating the watercraft
VX-C:
When the engine is running, the watercraft
will move forward at trolling speed even if the
throttle lever is in the fully closed (idle) posi-
tion.
VX / VX DELUXE / VX CRUISER / VX
LIMITED: When the throttle lever is squeezed, the “F”
(forward) shift indicator will be displayed and
the watercraft will move forward. While the
“F” (forward) shift indicator is displayed, the
watercraft will move forward at trolling speed
even if the throttle lever is in the fully closed
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Operation
82
(idle) position. (See page 30 for shift system
operation procedures.)
VX
VX DELUXE / VX CRUISER / VX LIMITED
EJU43423Turning the watercraftEWJ01783
Do not release the throttle lever when
trying to steer away from objects—aswith other powerboats, you need throt-
tle to steer. A collision could result in se-
vere injury or death.
When operating at higher speeds, make
gradual turns or slow down before turn-
ing. Sharp high-speed turns may cause
the watercraft to slide sideways or spin,
throwing the operator and passenger(s)
overboard, which could cause an injury.
VX / VX DELUXE / VX CRUISER / VX
LIMITED: Take early action to avoid col- lisions. The RiDE system is not a braking
device for avoiding dangerous situa-
tions.
Steering control depends on the combination
of handlebar position and the amount of
throttle.
Water sucked in through the intake grate is
pressurized by the impeller in the jet pump.
As the pressurized water is expelled from the
pump through the jet thrust nozzle, it creates
thrust to move and steer the watercraft. The
higher the engine speed, the more thrust pro-
duced.
The amount of jet thrust, in addition to the po-
sition of the handlebars, determines how
sharply you turn.
A. More throttle produces higher thrust, so the watercraft will turn more sharply.
1“F” (Forward position)
1 “F” (Forward position)
1
14.3V
km/h
RPM
1
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Operation
83
B. Less throttle produces lower thrust, sothe watercraft will turn more gradually.
C. Releasing the throttle lever completely produces only minimum thrust. If you are
traveling at speeds above trolling, you
will have rapidly decreasing ability to
steer without throttle. You may still have
some turning ability immediately after re-
leasing the throttle lever, but once the
engine slows down, the watercraft will no
longer respond to handlebar input until
you apply throttle again or you reach
trolling speed.
At trolling speed, the watercraft can be
turned gradually by handlebar position
alone using just the amount of thrust
available at idle.
D. If the engine is stopped while riding, there is no thrust. The watercraft will go straight even though the handlebars are
turned.
You need throttle to steer.
E. VX / VX DELUXE / VX CRUISER / VX LIMITED: If the RiDE lever is squeezedand the handlebars are turned when the
watercraft is cruising at planing speed,
the watercraft will turn gradually while
slowing down.
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 (see condition C above).
The OTS system assists in turning by con-
tinuing to supply some thrust while the water-
craft is decelerating, but you can turn more
sharply if you apply throttle while turning the
1 Reverse gate
E
1
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