Owner`s manual

3-15
INSTRUMENT AND CONTROL FUNCTIONS
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EAU00326
YPVS
This model is equipped with the
YPVS (Yamaha Power Valve
System). This system 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-con-
trolled servomotor.
1. YPVS
Since the YPVS is an important part
of the engine and requires very
sophisticated adjustment, have a
Yamaha dealer, who has the neces-
sary professional knowledge and
experience, make this adjustment.
EC000023
cC
The YPVS has been set and exten-
sively tested at the Yamaha facto-
ry. Changing these settings with-
out sufficient technical knowledge
may result in poor performance of
or damage to the engine.
YPVS operation noises can be heard
in the following instances:
8 When the key is turned to “ON”
and the engine is started.
8 When the engine stalls with the
key in the “ON” position.
EC000024
cC
If the YPVS does not operate, have
a Yamaha dealer check it.
EW000041
w
This shock absorber contains
highly pressurized nitrogen gas.
For proper handling, read and
understand the following informa-
tion before handling the shock
absorber. The manufacturer can-
not be held responsible for proper-
ty damage or personal injury that
may result from improper han-
dling.
8 Do not tamper with or attempt
to open the gas cylinder.
8 Do not subject the shock
absorber to an open flame or
other high heat sources, other-
wise it may explode due to
excessive gas pressure.
8 Do not deform or damage the
gas cylinder in any way, as
this will result in poor damp-
ing performance.
8 Always have a Yamaha dealer
service the shock absorber.
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