Ducati ST4s Owner's Manual page 120

Unscrew 2 of the 4 lower screws (2, fig. 28.2) that hold
the body panels together and to the central air conveyor.
Remove the lower body panels.
E
42
Instrument panel side guards (fig. 29)
Remove the screw in the centre (1) joining the two side
guards together and the two screws (2) that secure them
to the inner headlamp guard.
Note
These screws have nylon washers (3).
2
3
2
fig. 28.2
1
fig. 29