Yamaha SXV70ERG, Supplementary Service Manual

Page: 20 / 173

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YAMAHA POWER VALVE SYSTEM (Y.P.V.S.) ADJUSTMENT
INSP
ADJ
WARNING
NOTE:
WARNING
YAMAHA POWER VALVE SYSTEM (Y.P.V.S.)
ADJUSTMENT
When adjusting the valve clearance, do not
operate the engine.
1. Adjust:
S
Y.P.V.S.
Adjustment steps:
SXV70
S
Remove the front panel (right).
S
Remove the Y.P.V.S. check coupler cap 1 .
S
Connect the Y.P.V.S. adjustment coupler 2 to
the Y.P.V.S. check coupler 3 .
S
Connect the Y.P.V.S. adjustment coupler leads
as follows.
S
Turn the main switch to “ON”.
Y.P.V.S. (+) adjustment coupler lead 4
!
Battery (+) terminal 5
Y.P.V.S. (–) adjustment coupler lead 6
!
Battery (–) terminal 7
Y.P.V.S. adjustment coupler:
YS-43092–1
S
When battery power is applied, the Y.P.V.S.
valve should fully open.
S
If the valve does not fully open, check the Ser-
vo motor. Refer to “YAMAHA POWER VALVE
SYSTEM (Y.P.V.S.)”.
Failure to use the proper Y.P.V.S. adjustment
coupler may result in internal damage to the
CDI unit.
SXV70ER
S
Turn the main switch to “ON”.
S
Slide back the adjuster covers
8
.
S
Loosen the locknuts 9 .
S
Turn the adjusting nuts
10
in or out until the
specified clearance is obtained.