If the fuel level indicator light (1) does not function properly, check the fuel level gauge and its lead wire/ coupler.
If the fuel level gauge and its lead wire/coupler are functioning properly, replace the combination meter with a new one.

Engine coolant temperature indicator light inspection
Fuel level gauge inspectionCooling system inspection
Inspect cooling system
every 6 000 km (4 000 miles, 6 months)
Replace engine coolant
every 2 years
Engine coolant level inspection
Hold the motorcycle vertically.
Check the engine coolant level by observing the “f” and “l” lines on
the engine coolant reservoir tank. If the level i ...
Ignition switch removal and installation
Removal
Remove the air cleaner box. Refer to “air cleaner box removal and
installation” in section 1d .
Disconnect the ignition switch lead wire coupler (1).
Disconnect the immobilizer lead wire coupler (2).
(For e-02, 19, 24, 51)
Remove the harness clamp (3).
...
Schematic and routing diagram
Cooling circuit diagram
Water hose routing diagram
Thermostat air bleeder hole
Cushion
O-ring
Radiator heat guard
: be careful not to damage the pawls when removing.
Yellow
marking
White
marking
Clamp end
should face downward
...