Ducati Monster S4R Owner's Manual page 106

Standard factory setting is as follows:
compression: 12 clicks;
rebound: 11 clicks.
The max. setting range is 14 clicks (rebound) and 16
clicks (compression) that ensure the softest damping.
To change the preload of the spring inside each fork leg,
turn the adjusting nut (2) with a 22-mm hexagon wrench.
Preload setting range (A) is from 25 to 10 mm.
Factory setting is 16 mm.
Important
Adjust both fork legs to same settings.
A
3
1
E
2
fig. 26
fig. 27
31