An actuator device for a hydraulic actuation system of a brake/clutch of a motorcycle, comprising: - a support structure associable with a handlebar of the motorcycle, - an actuation assembly having a push rod, operatively connectable to at least one braking device, - an actuation lever rotationally connected to the support structure about an actuation axis (S-S) in a first and a second direction towards and away from the associable handlebar, equipped with a pusher adapted to interface with said push rod - adjustment means adapted to modify both the angular position, in a rest condition, of the pusher and of the actuation lever with respect to the handlebar and to modify a pitch between the actuation axis (S-S) of the actuation lever and a contact and thrust point of the pusher on said push rod - wherein the adjustment means comprise a bushing inserted in a counter-shaped cylindrical seat of the actuation lever having a symmetry axis (Y-Y), so as to be able to at least rotate about said symmetry axis (Y-Y), the adjustment means comprise said pusher having a tang, inserted inside the bushing, and a bowl, integral with the tang, which interfaces with the push rod, said bowl being misaligned with respect the symmetry axis (Y-Y) by an eccentricity, so as to be able to vary the pitch by rotating the bowl about the symmetry axis (Y-Y), - wherein the pusher slides with respect to the actuation lever parallel to said symmetry axis (Y-Y), - wherein the translation and eccentric rotation movements of the pusher with respect to the symmetry axis (Y-Y) are mechanically independent of each other, characterized in that the bushing is fitted in the cylindrical seat so as to be able to rotate and not translate with respect to the cylindrical seat along the symmetry axis (Y-Y). - a support structure associable with a handlebar of the motorcycle, - an actuation assembly having a push rod, operatively connectable to at least one braking device, - an actuation lever rotationally connected to the support structure about an actuation axis (S-S) in a first and a second direction towards and away from the associable handlebar, equipped with a pusher adapted to interface with said push rod - adjustment means adapted to modify both the angular position, in a rest condition, of the pusher and of the actuation lever with respect to the handlebar and to modify a pitch between the actuation axis (S-S) of the actuation lever and a contact and thrust point of the pusher on said push rod - wherein the adjustment means comprise a bushing inserted in a counter-shaped cylindrical seat of the actuation lever having a symmetry axis (Y-Y), so as to be able to at least rotate about said symmetry axis (Y-Y), the adjustment means comprise said pusher having a tang, inserted inside the bushing, and a bowl, integral with the tang, which interfaces with the push rod, said bowl being misaligned with respect the symmetry axis (Y-Y) by an eccentricity, so as to be able to vary the pitch by rotating the bowl about the symmetry axis (Y-Y), - wherein the pusher slides with respect to the actuation lever parallel to said symmetry axis (Y-Y), - wherein the translation and eccentric rotation movements of the pusher with respect to the symmetry axis (Y-Y) are mechanically independent of each other,