Maintenance and care
71
(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.
EJU34392
Cleaning 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 24 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.
1
Rubber cover
2
Locknut
3
Adjuster
4
Throttle lever free play
Throttle lever free play:
4.0–7.0 mm (0.16–0.28 in)
Specified spark plug:
CR9EB
1
Spark plug gap
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