Instrument and control functions
4-17
4
EAU84180
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.
ECA26380
The YPVS system has been exten-
sively tested and set-up by Yamaha.
Changing the YPVS settings without
sufficient technical knowledge can
result in reduced engine perfor-
mance or even engine damage.
UBR811E0.book Page 17 Thursday, March 21, 2019 10:27 AM
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