Table of Contents
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Instrument and control functions
YPVS system
This model's engine is fitted with
Yamaha Power Valve System (YPVS).
This system boosts engine power by
means of a valve that controls exhaust
port opening aperture.
NOTICE
The YPVS system has been exten-
sively tested and set-up by Yamaha.
Changing the YPVS settings without
sufficient technical knowledge can
4
result in reduced engine perfor-
mance or even engine damage.
EAU84180
ECA26380
4-17
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Troubleshooting
