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 inspectionVoltage check
If voltage is supplied to the circuit being checked, voltage
check can be used as circuit check.
With all connectors/couplers connected and voltage
applied to the circuit being checked, measure
voltage between each terminal and body ground.
If measurements were taken as shown ...
Spark plugs
Your motorcycle comes equipped
with ngk cr9e or denso
u27esr-n spark plugs. To determine
if the standard spark plug is
right for your usage, check the
color of the plug's porcelain center
electrode insulator after motorcycle
operation. A light brown
color indicates that the plug is correct.
...
Gearshift lever construction
Gearshift lever bracket
Gearshift lever shaft
Washer
Snap ring
Gearshift lever
Footrest top surface
65 – 75 Mm (2.6 – 3.0 In)
28 N·m (2.8 Kgf-m,
20.0 Lbf-ft)
40 N·m
(4.0 Kgf-m, 29.0 Lbf-ft)
Apply grease.
Grease.
...