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 or not it is necessary to replace the gear or the fork by referring to the limits specified for each part (sect. 3 - 1.1, Gearbox).



Overhaul of the gearbox
Inspection of the gear selector drumRemoval of the swingarm
Before removing the parts in question, you must first carry out the following
operations:
Remove the rear wheel eccentric hub as described in chapter "removal of the
rear wheel eccentric hub and rear wheel
shaft" of this section.
Loosen screws (7) and remove the hose grommets (13), (15) ...
Tool kit and accessories
The tool kit (2) is located under the seat (1) while the owner’s
manual is housed in the compartment under the seat.
The tool kit includes:
Fuse pliers;
Two helmet anti-theft cables;
Screwdriver;
Screwdriver handle;
14/16 Mm box wrench;
6 Mm rod;
3 Mm allen wrench;
4 Mm allen ...
Refitting the rear wheel
Lubricate the wheel shaft threaded end with prescribed grease.
Insert the wheel shaft by matching (a) with pins (b).
Install spacer (3) with the conical surface faced to the wheel conical
surface, washer (2), apply prescribed grease to nut
(1) and insert it by hand (1).
Tighten the ...