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 related components
Drive chain
Engine sprocket
Rear sprocket
Dust seal
Bearing
Retainer
Sprocket mounting drum
Wheel damper
145 N·m (14.5 Kgf-m,
105.0 Lbf-ft)
60 N·m
(6.0 Kgf-m, 43.0 Lbf-ft)
Apply grease
Apply thread lock to
thread p ...
Valve guide replacement
Remove the cylinder head. Refer to “engine top side disassembly” .
Remove the valves. Refer to “cylinder head disassembly and assembly” .
Using the valve guide remover, drive the valve guide
out toward the intake or exhaust camshaft side.
Special tool
(a): 09916–43211 (valve ...
Ignition system check
Remove the spark plugs and
reattach them to the spark
plug caps.
Put the engine stop switch in
the "" position and ignition
switch in the "on" position.
While holding a spark plug
with its base firmly against the
engine, push the electric
starter butt ...