Ducati MONSTER S4Rs Manuel D'utilisation Et Entretien page 132

Notes
This procedure is the one specified by Italian
regulations for checking the maximum height of light
1
beams.
Owners in other countries should adapt this procedure to
the regulations in force in the country where the motorcycle
is used.
E
The vertical aim of the headlamp is adjusted by turning the
screws (1, fig. 58) that attach it to the side mountings.
fig. 58
57