Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 960

Rotate the crankshaft by 270° in its rotation sense so as to bring the vertical cylinder piston to the stroke TDC.
Check the vertical cylinder belt tension in the indicated point (E).
Tension the belt according to the values indicated in the table.
Cold belt tension adjustment
Note
With used belt we mean after the first heating up of the engine.
Tighten nut (10) to a torque of 25 Nm (Min. 22 - Max. 28).
Reference Assembly Value
(new belt)
DDS 2 90 ± 5 Hz (horizontal)
90 ± 5 Hz (vertical)
Assembly Value
(used belt)
80 ± 5 Hz (horizontal)
80 ± 5 Hz (vertical)