The exhaust control system (excs) consists of the exhaust control valve (excv), exhaust control valve actuator (excva) and exhaust control valve cables (excv cables).
Excv is installed in the exhaust pipe. Excva is mounted inside of the right frame. The excv is operated by the excva via the cables. This system is designed to improve the engine torque at low engine rpm.

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Exhaust control system operationTampering with noise control system prohibited
Federal law prohibits the following
acts or the causing there of;
The removal or rendering inoperative
by any person other
than for purposes of maintenance,
repair, or replacement,
of any device or element of
·design incorporated into any
new vehicle for the purpose of
noise ...
Front fork removal and installation
Note
the right and left front forks are installed
symmetrically and therefore the removal
procedure for one side is the same as that for
the other side.
Removal
Remove the front wheel. Refer to “front wheel assembly removal and
installation” in section 2d .
...
Fastener removal and installation
Type a
Removal
Depress the head of fastener center piece (1).
Pull out the fastener (2).
Installation
Let the center piece stick out toward the head so that
the pawls “a” closes.
Insert the fastener into the installation hole.
Note
to prevent the pawl ...