The front fork used on this motorcycle has rebound, compression and spring preload adjustment.
The settings are adjusted using external adjuster screws.

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.
Turn the adjuster (3) on fork leg bottom with a flat screwdriver to adjust compression damping.
Turn the adjusting screws (1 and 3) to adjust the dampening.
Turn the screw all the way in to set the hardest damping (position "0"). Starting from this position, turning anticlockwise, you can count the turns.
To change preload of the spring inside each fork leg, turn the hex. Adjuster (2, fig. 109) With a 22 mm hexagon wrench, starting from the fully open position (clockwise). From reference (a, fig. 109), 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 and a half turns; rebound: 1 and a half turns.
Spring preload: fully open (anticlockwise).
Important
Adjust both fork legs to same settings.
Passenger grabhandle
Adjusting the rear shock absorberRefitting the expansion tank
If the support (15) has been removed, place the hose clamps (14) on the
bracket (15) orienting them as indicated.
Fully press the pins (a) to block the clamps (14) until pins surfaces (b) are at
the same level of the clamps (14) surfaces.
Apply recommended threadlocker to the thread of the ...
Lubricating cables and joints
Check the outer sheath of the throttle control and cold start
lever cables for damage at regular intervals. The outer plastic
cover should not be flattened or cracked. Operate the
controls to make sure the inner cables slide smoothly inside
the outer sheath: if you feel any friction or catching, ...
Refitting the filler cap
Position seal (18) in tank cap (10) as shown and reassemble following the
removal procedure in the reverse sequence.
In particular tighten the screws (17) to a torque of 3 nm +/- 10% (sect. 3 - 3,
Frame torque settings).
...