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YAMAHA POWER VALVE SYSTEM (Y.P.V.S.) ADJUSTMENT
SDN2250
1
3
2
0
8
9
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SDN2255
SDN2260
4
5
6
7
SDN2270
2-15
YAMAHA POWER VALVE SYSTEM (Y.P.V.S.)
ADJUSTMENT
WARNING
When adjusting the valve clearance, do not oper-
ate the engine.
1. Remove:
•
Y.P.V.S. valve assembly 1
2. Adjust:
•
Y.P.V.S.
Adjustment steps:
•
Remove the Y.P.V.S. check coupler cap 1.
•
Connect the Y.P.V.S. adjustment coupler 2 to
the Y.P.V.S. check coupler 3.
•
Connect the Y.P.V.S. adjustment coupler
leads as follows.
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
NOTE:
•
When battery power is applied, the Y.P.V.S.
valve should fully open.
•
If the valve does not fully open, check the
Servo motor. Refer to "YAMAHA POWER
VALVE SYSTEM (Y.P.V.S.)" in CHAPTER 8.
•
Slide back the adjuster covers 8.
•
Loosen the locknuts 9.
•
Turn the adjusting nuts 0 in or out until the
specified clearance is obtained.
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