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 operationRadiator reservoir tank inspection
Inspect the radiator reservoir tank in the following
procedures:
remove the right side cowling. Refer to “exterior parts removal and
installation” in section 9d .
Inspect the radiator reservoir tank (1) for leaks. If any
defects are found, replace the radiator reservoir tank
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Special tools and equipment
Recommended service material
Note
required service material is also described in the following.
“Front fork components”
Special tool
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Camshaft sprocket
Inspect the camshaft sprocket in the following
procedures:
remove the intake and exhaust camshafts. Refer to “engine top side
disassembly” .
Inspect the teeth of each camshaft sprocket for wear
or damage.
If they are worn or damaged, replace the sprocket/
camshaft assembl ...