Ducati MONSTER S4Rs Manuel D'utilisation Et Entretien page 106

Standard settings:
compression: 12 clicks;
rebound: 10 clicks.
Spring preload (fig. 25):
To adjust the preload of the spring inside each fork leg, turn
the hexagonal adjuster nut (2) with a 22 mm hex wrench.
Important
Adjust both fork legs to same setting.
19 mm
1
2
fig. 25
fig. 26
3
E
31