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 operationBattery removal and installation
Removal
Remove the front seat. Refer to “exterior parts
removal and installation” in section 9d (page 9d-
6).
Disconnect the battery (–) lead wire (1).
Disconnect the battery (+) lead wire (2).
Note
be sure to disconnect the battery (–) lead
wire (1) first, th ...
Exhaust emission control system
description
The exhaust emission control system is composed of the pair system, exhaust
control system, ho2 sensor, threeway
catalyst system and isc system. The fresh air is drawn into the exhaust ports
through the pair control solenoid
valve and pair reed valves. The pair control solenoid valve is operat ...
Gearshift shaft oil seal / bearing removal and installation
Removal
Remove the gearshift shaft. Refer to “gearshift shaft / gearshift cam
plate removal and installation” .
Remove the gearshift shaft oil seal (1).
Remove the bearings (2) and (3) with the special
tools.
Special tool
(a): 09921–20210 (bearing remover
(12
mm))
...