2007 YAMAHA FX HO spark plugs

Table of contents
Post-operation care ...................... 73
Transporting ................................. 75
Maintenance and care ..................... 76
Storage ......................................... 76
Flushing the cooling system ............ 76
Lubrication ....................................... 77
Fuel system ..................................... 77
Battery ............................................. 78
Cleaning the watercraft ................... 78
Maintenance and adjustments ..... 79
Owner’s/operator’s manual and
tool kit ........................................... 80
Periodic maintenance chart ............. 81
Checking the fuel system ................ 83
Engine oil and oil filter ..................... 83
Checking the air filter element ......... 84
Checking the jet thrust nozzle
angle ............................................ 85
Checking the shift cable .................. 85
Checking and adjusting the throttle
cable ............................................ 85
Cleaning and adjusting
the spark plugs ............................. 86
Lubrication points ............................ 87
Checking the battery ....................... 88
Fuel injection system ....................... 90
Specifications .................................. 91
Specifications ................................ 91
Trouble recovery ............................. 92
Troubleshooting ........................... 92
Troubleshooting chart ...................... 92
Emergency procedures ................ 94
Cleaning the jet intake and
impeller ........................................ 94
Jumping the battery ......................... 95
Replacing the fuses ......................... 96
Towing the watercraft ...................... 97
Submerged watercraft ..................... 97
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Features and functions
23
Engine compartment
1Air filter case
2Water separator
3Fuel tank
4Battery
5Flushing hose connector
6Electrical box
7Oil tank
8Muffler
9Spark plugs/Spark plug caps/Ignition coils
10Spark plug lead
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Maintenance and care
81
EJU33820Periodic 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 86
Lubrication pointsLubricate 87
Intermediate hous-
ingLubricate 87
Fuel systemCheck 83
Fuel tankCheck, clean 83
Trolling speedCheck, adjust 90
Throttle shaftCheck—
Cooling water pas-
sagesFlush
*76
Water inlet strain-
erCheck, clean—
Bilge strainerClean—
Electric bilge
pump strainerCheck, clean—
ImpellerCheck—
Jet thrust nozzle
angleCheck, adjust 85
Steering masterCheck—
QSTS mechanismCheck, adjust—
Shift cable and re-
verse gateCheck, adjust 85
Throttle cableCheck, adjust 85
Stern drain plugsCheck, replace 55
BatteryCheck, charge 88
Rubber couplingCheck—
Engine mountCheck—
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Maintenance and care
86
EJU34381Cleaning 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 spark
plugs 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 air filter case cover and air
filter element. (See page 84 for air filter
element removal and installation proce-
dures.)
(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 plugor adjust the gap to specification if neces-
sary.
To install a spark plug:
(1) Clean the gasket surface.
(2) Wipe any dirt from the threads of the
spark plug.
(3) Install the spark plug, and then tighten it
to the specified torque.
(4) Install the spark plug cap.
NOTE:

Wipe off any water on the spark plug or in-
side the spark plug cap before installing the
cap. Push the spark plug cap down until it is
securely installed.

If a torque wrench is not available when you
are installing a spark plug, a good estimate
of the correct torque is 1/4 turn to 1/2 turn
past finger tight using the spark plug
wrench included in the tool kit. Have the
spark plug adjusted to the correct torque
with a torque wrench as soon as possible.
Specified spark plug:
CR9EB
1Spark plug gap
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Spark plug tightening torque:
12.5 Nm (9.2 ft-lb) (1.27 kgf-m)
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Trouble recovery
97
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 isthree 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 54
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-
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.
1Bow eye
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Trouble recovery
98
(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.
UF1X71E0.book Page 98 Tuesday, September 26, 2006 9:52 AM

Index
Lubrication................................................ 77
Lubrication points ..................................... 87
M
Main components, location of .................. 20
Maintenance and adjustments ................. 79
Model information....................................... 2
Multifunction information center ......... 34, 60
O
Oil pressure warning indicator.................. 40
Operating your watercraft......................... 64
Operation ................................................. 61
Operation of controls and
other functions ...................................... 24
Operation requirements ........................... 12
Owner’s/operator’s manual and tool kit .... 80
P
Periodic maintenance chart...................... 81
Post-operation care .................................. 73
Pre-operation check list............................ 51
Pre-operation check points ...................... 53
Pre-operation checks ............................... 51
Primary Identification (PRI-ID) number ...... 1
Pull-up cleats
(for FX Cruiser High Output) ................. 33
Q
Quick Shift Trim System (QSTS) ............. 58
Quick Shift Trim System (QSTS)
selector ................................................. 30
R
Reboarding step ....................................... 32
Recommended equipment ....................... 14
Remote control transmitter ....................... 26
Reverse on waterways ............................. 72
Riding with passengers ............................ 65
Right multifunction display and
operation buttons
(for FX Cruiser High Output) ................. 42
Rough water operation ............................. 73
“RPM” indicator light................................. 36
S
Safe boating rules .................................... 19
Seat storage compartment ....................... 46
Seats ........................................................ 24
Shift cable, checking ................................ 85
Shift lever ................................................. 29Shift lever and reverse gate ..................... 57
Spark plugs, cleaning and adjusting ........ 86
“SPEED” indicator light ............................ 36
Start switch............................................... 27
Starting the engine ................................... 61
Starting the watercraft .............................. 65
Steering system ................................. 28, 57
Stern drain plugs ...................................... 55
Stern eyes ................................................ 33
Stopping the engine ................................. 63
Stopping the watercraft ............................ 72
Storage..................................................... 76
Storage compartments ............................. 45
Submerged watercraft .............................. 97
Switches ................................................... 60
T
Throttle cable, checking and adjusting ..... 85
Throttle lever ...................................... 28, 57
Tilt lever .................................................... 29
Towing the watercraft ............................... 97
Transporting ............................................. 75
Trolling speed, checking .......................... 90
Troubleshooting ....................................... 92
Troubleshooting chart .............................. 92
Turning the watercraft .............................. 70
U
“UNLOCK” indicator light .......................... 37
W
“WARNING” indicator light ....................... 37
Water separator ....................................... 54
Watercraft characteristics ......................... 15
Water-skiing ............................................. 17
Watertight compartment ........................... 47
Y
Yamaha Engine Management
System (YEMS) .................................... 33
Yamaha Security System ......................... 33
Yamaha Security System lock and
unlock modes........................................ 33
UF1X71E0.book Page 2 Tuesday, September 26, 2006 9:52 AM