Yamaha 2004 WaveRunner FX140 Owner's Manual page 109

To install the spark plug:
1. Clean the gasket surface.
2. Wipe any dirt from the threads of the
spark plug.
3. Screw the spark plug to the correct
torque.
Spark plug tightening torque:
12.5 N·m (1.25 kgf·m, 9 ft·lb)
NOTE:
@
G
Wipe off any water on the spark plug or
inside the cap before installing the spark
plug cap. Push the spark plug cap down
until it is securely installed.
G If a torque wrench is not available when
you are fitting a new spark plug, a good
estimate of the correct torque is 1/4 turn
to 1/2 turn past finger tight with 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.
@
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 lead to explosion
or fire.
@
4. Install the air filter element in the air filter
case, and then install the air filter case
cover.
4-16
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