Remove the seat and turn it upside down.
Loosen the special screws (4), turn the plates (5) and open the seat cover (2) lateral sides to slide it out.

Removal of the seat
Reassembly of the seatRoutine maintenance record
...
Replacing the front phonic wheel sensor
Disconnect the front abs sensor (2) connector (a) from the main electric
wiring.
Open all the retainer clamps of the front abs sensor cable (2): refer to table
of sect. 7 - 6, Flexible wiring/hoses
positioning.
Loosen retaining screw (1) and remove the front abs sensor (2) with
ca ...
Inspection of the gear selector forks
Visually inspect the gear selector forks. Bent forks must be renewed as they
may lead to difficulties in gear changing or
may suddenly disengage when under load.
Use a feeler gauge to check the clearance of each fork in its gear groove.
If the service limit has been exceeded, check whether ...