spark plugs replace YAMAHA VX 2009 Owners Manual

Maintenance and care
66
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 70
Lubrication pointsLubricate 71
Fuel systemCheck 68
Fuel tankCheck, clean 68
Trolling speedCheck, adjust 73
Throttle shaftCheck—
Cooling water pas-
sagesFlush
*62
Water inlet strain-
erCheck, clean—
Bilge strainerClean—
ImpellerCheck—
Jet thrust nozzle
angleCheck, adjust 68
Shift cable and re-
verse gate
(VX Deluxe/VX
Cruiser)Check, adjust 69
Throttle cableCheck, adjust 69
Stern drain plugsCheck, replace 44
BatteryCheck, charge 72
Rubber couplingCheck—
Engine mountCheck—
Nuts and boltsCheck—
Air filter elementCheck 68
Engine oilReplace 68
UF2L70E0.book Page 66 Thursday, June 19, 2008 8:38 AM

Maintenance and care
70
(3) Adjust the free play by turning the adjust-
er.
(4) Hold the adjuster with one wrench while
tightening the locknut with another
wrench. Slide the rubber cover to its orig-
inal position.
(5) Install the front handlebar cover, and then
install the six screws.
EJU34392Cleaning and adjusting the spark
plugs
WARNING
EWJ00350
Be careful not to damage the insulator
when removing or installing a spark plug.
A damaged insulator could allow sparks to
escape, which could result in a fire or ex-
plosion.
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 seat. (See page 23 for seat
removal and installation procedures.)
(2) Remove the spark plug cap. NOTICE:
Do not use any tools to remove or in-
stall the spark plug cap, otherwise the
ignition coil coupler could be dam-
aged. The spark plug cap may be diffi-
cult to remove because 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.
[ECJ00211]
(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.
1Rubber cover
2Locknut
3Adjuster
4Throttle lever free play
Throttle lever free play:
4.0–7.0 mm (0.16–0.28 in)
Specified spark plug:
CR9EB
1Spark plug gap
UF2L70E0.book Page 70 Thursday, June 19, 2008 8:38 AM