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 operationEngine top side disassembly
It is unnecessary to remove the engine assembly from
the frame when servicing the cylinder head cover and
camshafts.
Note
before servicing the engine top side
components (until camshafts removal) with
the engine in place, remove the following
parts:
air cleaner box
...
Corrosion prevention
It is important to take good care of
your motorcycle to protect it from
corrosion and keep it looking new
for years to come.
Important information about
corrosion
Common causes of corrosion
Accumulation of road salt, dirt,
moisture, or chemicals in hardto-
reach areas.
Chipping ...
Malfunction code and defective condition table
* : Immobilizer system equipped model only. ...