Yamaha XLT800 WaveRunner 2004, Owner'S/Operator'S Manual, Page: 110 / 136

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NOTE:
@
● 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 clicks.
● 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. 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.
@
EJU20630
Inspecting the Yamaha Power
Valve System (YPVS)
Yamaha Power Valve System (YPVS)
boosts engine performance and efficiency
by means of a variable valve in the exhaust
port. The YPVS valve is constantly adjusted
in accordance with the engine speed by a
computer-controlled servomotor.
Since the YPVS is an important part of
the engine and requires very sophisticated
adjustment, have a Yamaha dealer, who has
the necessary professional knowledge and
experience, make this adjustment.
CAUTION:
@
The YPVS has been set and extensively
tested at the Yamaha factory. Changing
these settings without sufficient techni-
cal knowledge can result in poor perfor-
mance of or damage to the engine.
@
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