Inspecting The Yamaha Power Valve System (Ypvs) - Yamaha GP800R WaveRunner 2005 Owner's/Operator's Manual

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 installing 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 cor-
rect torque with a torque wrench as soon
as possible.
@
WARNING
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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 an explo-
sion or fire.
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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:
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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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