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 playFuel and oil recommendation
Fuel (for USA and Canada)
Use only unleaded gasoline of at least 90 pump octane
(r/2 + m/2).
Gasoline containing mtbe (meltyl tertiary butyl ether),
less than 10% ethanol, or less than 5% methanol with
appropriate cosolvents and corrosion inhibitor is
permissible.
Fuel (for other countries) ...
DTC “c91” (p0500): vehicle speed sensor
circuit malfunction
Detected condition and possible cause
Detected condition
Possible cause
Speedometer does not receive signal from the vehicle
speed sensor for more than 6 sec. When the motorcycle is
running. Ecm does not receive signal from the vehicle
speed sensor for more than ...
General description
Engine coolant description
Caution
use a high quality ethylene glycol base
anti-freeze, mixed with distilled water. Do
not mix an alcohol base anti-freeze and
different brands of anti-freeze.
Do not put in more than 60% anti-freeze or
less than 50%. (Refer ...