spark plugs replace YAMAHA SUPERJET 2009 Owners Manual

Maintenance and care
49
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 55
Lubrication pointsLubricate 56
Intermediate hous-
ingLubricate 56
Fuel systemCheck 51
Fuel filterCheck, clean, replace 51
Fuel tankCheck, clean 51
CarburetorCheck, adjust 58
Trolling speedCheck, adjust 58
Carburetor throt-
tle shaftCheck —
Cooling water pas-
sagesFlush
*45
Bilge strainerClean —
ImpellerCheck —
Jet thrust nozzle
angleCheck, adjust 51
Handlebar pivot
shaftCheck —
Steering frictionCheck, adjust 52
Throttle cableCheck, adjust 54
Choke cableCheck, adjust 57
BatteryCheck, charge 57
Rubber couplingCheck —
Engine mountCheck —
UF2F71E0.book Page 49 Thursday, April 10, 2008 11:47 AM

Maintenance and care
55
(4) Hold the adjuster with one wrench while
tightening the locknut with another
wrench.
(5) Install the handlebar cover and the four
screws.
EJU34374Cleaning 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 the
center electrode porcelain is very white, this
could indicate an intake air leak or carburetion
problem in that cylinder. Do not attempt to di-
agnose 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 hood. (See page 17 for hood
removal and installation procedures.)
(2) Remove the spark plug cap.(3) Remove the spark plug.
Measure the spark plug gap with a wire
thickness gauge. Replace the spark
plugs or adjust the gap to specification if
necessary.
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) Wipe off any water on the spark plug or
inside the spark plug cap, and then install
the cap. Push the spark plug cap down
until it is securely installed.
TIP:
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 in-
cluded in the tool kit. Have the spark plug ad-
justed to the correct torque with a torque
wrench as soon as possible.
(5) Install the hood. Throttle lever free play:
7.0–10.0 mm (0.28–0.39 in)
Specified spark plug:
BR7HS
1Spark plug gap
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Spark plug tightening torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
UF2F71E0.book Page 55 Thursday, April 10, 2008 11:47 AM