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Maintenance and care
Throttle lever free play:
7.0–10.0 mm (0.28–0.39 in)
(4) Hold the adjuster with one wrench while
tightening the locknut with another
wrench.
(5) Install the handlebar cover and the four
screws.
EJU34374
Cleaning and adjusting the spark
plugs
EWJ00350
WARNING
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.
Specified spark plug:
BR7HS
To remove a spark plug:
(1) Remove the hood. (See page 17 for hood
removal and installation procedures.)
(2) Remove the spark plug cap.
55
(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.
1 Spark plug gap
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
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.
Spark plug tightening torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
(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.
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