Ducati Diavel Workshop Manual page 91

Maintenance operations
3) compression damping.
Park the motorcycle in a stable position on its side stand.
Turn the adjuster (1) on fork leg top with a flat screwdriver to adjust rebound damping.
On the Carbon model, adjustment is done using the knob (B) on the fork leg, without a screwdriver.
Turn the adjuster (3) on fork leg bottom with a flat screwdriver to adjust compression damping.
As you turn the adjusters (1) and (3), you will hear them click. Each click corresponds to different damping setting.
The stiffest damping setting is obtained with the adjuster turned fully clockwise to the "0" position. Starting from this
position, turning counter clockwise, you can count the turns.
To change preload of the spring inside each fork leg, turn the hex. adjuster (2) with a 22 mm hexagon wrench, starting
from the fully open position (clockwise). From reference (A), every full turn clockwise corresponds to 1 mm of preload of
the spring, up to a maximum of 15 mm, corresponding to 3 full turns.
STANDARD settings, from fully open position, are as follows:
Compression:
1 turn and a half;
Rebound:
1 and a half turns.
Spring preload: FULLY OPEN (counter clockwise).
Important
Adjust both fork legs to same settings.
Adjusting the rear shock absorber
The adjuster (1) located on the lower connection holding the shock absorber to the swingarm adjusts the damping during
the rebound phase (return).
The knob (2), located on the left side of the motorcycle, adjusts the preload of the shock absorber external spring.