Use a gauge to measure the clearance between fork pin and the slot on the selector drum.
If the service limit is exceeded, determine which part must be replaced by comparing these dimensions with those of new components (sect. 3 - 1.1, Gearbox).
Also check the wear on the drum support pins; these must not show any signs of scoring, burrs, or deformation.
Turn the drum in the crankcase to establish the extent of radial play. If play is excessive, change whichever part is most worn.


Inspection of the gear selector forks
Reassembly of the gearbox shaftsRemoval of the starter motor idler gear
Slide the gear pin (21) complete with the gear (19) and washer (20).
Warning
Pay attention to the washer (20) since it may fall inside the
crankcase half.
At this point, it is possible to remove the starter motor as described in
sect. 6 - 3, Starter motor. ...
Refitting the timing belt driveshaft pulleys
To fit the circlip (10) in the driveshaft seat, use the tool code 88713.2834.
Install the inner spacer (17) on the driveshaft, taking care to align the
notch in the spacer with the slot for the woodruff
key.
Fit the first woodruff key (16) on the timing belt driveshaft.
Locate the ...
Adjusting of the air-gap phonic wheel sensor
(For front as well as rear sensor) in each case of maintenance that foresees:
Replacement or refitting of the wheel
Replacement or refitting of the phonic wheel (1) or (2)
Replacement or refitting of the brake discs
Replacement or refitting of the speed sensor (3) or (4)
(Front) replacem ...