Check the condition of the front coupling dogs of the gears. They must be in perfect condition and with no sign of wear on the edges of the teeth.
The idler gears must rotate freely on their shafts.
When refitting, make sure the circlips are correctly positioned.
Check the needle roller bearings for wear.
The threads and splines of the shafts must be in perfect condition.
Also check that the component parts of the gear selector mechanism are in good condition.
Engage

Engage the gears and check that the gearchange mechanism does not stick (selector fork - gear groove, and fork pin - desmodromic drum groove) due to incorrect end float. Restore the correct end float by shimming the gearbox shafts and the selector drum with suitable shims.
For the total gearbox shaft and selector drum end clearance values, refer to sect. 3 - 1.1, Gearbox.
Disassembly of the gearbox shafts
Inspection of the gear selector forksStands
Side stand
Side stand switch
Screw
Plate
Screw
Inner spring
Outer spring
Nut
Rotation pivot
Screw
Screw
Screw
Nut
Clearance adjuster
Spare parts catalogue
Diavel abs stand
Diavel carbon
abs
stand
Important
Bold reference numbers in this section identify part ...
Rear wheel
Right-hand wheel nut
Washer
Spacer
Valve
Wheel
Circlip
Spare parts catalogue
Diavel abs front and rear wheels
Diavel carbon
abs
front and rear wheels
Important
Bold reference numbers in this section identify parts not shown in the
figures alongside the text, but which can ...
Total distance covered indicator: "odometer"
This function shows the total distance covered by the vehicle
(in km or miles depending on the specific application).
At key-on the system automatically enters this function.
The odometer reading is stored permanently and cannot be
reset.
If the distance travelled exceeds 199999 km (or 19 ...