Adjust the engine idle speed periodically on the engine at normal operating temperature.
To adjust the idle speed:

Engine oil and filter change
Throtile cable playRear wheel assembly removal and installation
Removal
Loosen the axle nut (1).
Raise the rear wheel off the ground and support the
motorcycle with a jack or wooden block.
Caution
make sure that the motorcycle is supported
securely.
Remove the axle nut (1).
Loosen the left and right lock-nuts (2) an ...
DTC “c40” (p0505 / p0506 / p0507): isc
valve circuit malfunction
Detected condition and possible cause
Detected condition
Possible cause
C40/P0505
The circuit voltage of motor drive is
unusual.
Isc valve circuit open or shorted to ground.
Air passage clogged.
Isc valve is fixed.
Isc valve prese ...
Reporting safety defects
If you believe that your vehicle
has a defect which could cause a
crash or could cause injury or
death, you should immediately
inform the national highway traffic
safety administration (nhtsa)
in addition to notifying american
suzuki motor corp.
If nhtsa receives similar complaints,
it ma ...