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 operationSpecifications
Service data
Drive train
unit: mm (in) except ratio
Tightening torque specifications
Note
the specified tightening torque is described in the following.
“Transmission components” “gearshift lever construction”
“gearshift shaft / gearshift cam plate componen ...
Special tools and equipment
Recommended service material
Note
required service material is also described in the following.
“Clutch control system components” “clutch components”
Special tool
...
Special situations require special care
Of course, there are some times
when full-force braking is not the
correct technique. When the road
surface is wet, loose, or rough,
you should brake with care. When
you're leaned over in a corner,
avoid braking. Straighten up
before braking. Better yet, slow
down before entering the corner. ...