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 operationIgnition switch inspection
Inspect the ignition switch in the following procedures:
remove the air cleaner box. Refer to “air cleaner box removal and
installation” in section 1d .
Disconnect the ignition switch lead wire coupler (1).
Inspect the ignition switch for continuity with a tester.
If ...
Starter motor will not run
Note
make sure the fuses are not blown and the battery is fully-charged
before diagnosing.
Troubleshooting
Step
Action
Yes
No
1
Shift the transmission into neutral.
Grasp the clutch lever, turn on the ignition switch ...
Ignition switch removal and installation
Removal
Remove the air cleaner box. Refer to “air cleaner box removal and
installation” in section 1d .
Disconnect the ignition switch lead wire coupler (1).
Disconnect the immobilizer lead wire coupler (2).
(For e-02, 19, 24, 51)
Remove the harness clamp (3).
...