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 operationDrive chain cleaning and lubricating
Clean and lubricate drive chain
every 1 000 km (600 miles)
Clean and lubricate the drive chain in the following
procedures:
clean the drive chain with kerosine. If the drive chain
tends to rust quickly, the intervals must be
shortened.
Caution
do not use trichloroethyle ...
Clutch control system components
Push rod
Clutch release camshaft
Clutch release arm
Clutch cable
1 N·m (0.1 Kgf-m, 0.7
Lbf-ft)
6 N·m
(0.6 Kgf-m, 4.5 Lbf-ft)
10 N·m
(1.0 Kgf-m, 0.7 Lbf-ft)
Apply grease
Do not reuse.
...
Rear brake master cylinder parts inspection
Refer to “rear brake master cylinder disassembly and assembly” .
Master cylinder
Inspect the master cylinder bore for any scratches or
other damage.
Piston / rubber parts
Inspect the piston surface for any scratches or other
damage.
Inspect the primary cup, secondary cup and dust boot
...