Yamaha SXV70ERG, Supplementary Service Manual

Page: 21 / 173

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YAMAHA POWER VALVE SYSTEM (Y.P.V.S.) ADJUSTMENT /
YAMAHA POWER VALVE SYSTEM (Y.P.V.S.) PRE-SEASON CHECKS
INSP
ADJ
S
Loosen the bolts 11 .
Y.P.V.S. valve clearance:
2.0
X
3.5 mm (0.08
X
0.14 in)
Turning in
!
Clearance
a
is increased.
Turning out
!
Clearance
a
is decreased.
S
Tighten the bolts, locknuts 2 and push in the
adjuster cover.
Y.P.V.S. valve housing bolt:
8 Nm (0.8 m
S
kg, 5.8 ft
S
lb)
Locknut:
7 Nm (0.7 m
S
kg, 5.1 ft
S
lb)
S
Disconnect the Y.P.V.S. adjustment coupler
from the Y.P.V.S. check coupler.
S
Install the Y.P.V.S. check coupler cap.
YAMAHA POWER VALVE SYSTEM (Y.P.V.S.)
PRE-SEASON CHECKS
There may be excessive amounts of carbon on
the Y.P.V.S. valve which will cause the valve to
stick to the cylinder. In this case, the valve will
not operate. Therefore, be sure to check the
Y.P.V.S. as follows.
1 Cover
2 Cables
3 Puller
4 Valve