Make the rear wheel turn until you find the position where chain is tightest. Set the vehicle on the side stand. Push down the chain at the point of measurement and release. Measure the distance between the "aperture" upper profile and pin centre.
The read distance must be: 9 to 11 mm.

Important
If the drive chain is too tight or too slack, adjust it so that tension reading will fall within specified range.
To adjust the tension remove the rear splash guard (sect. 7 - 13, Removal of the swingarm).
Slacken off the two clamp screws (1) that secure the rear wheel hub to the swingarm.
Fit the hook spanner code 88713.1038 Inserting its tooth in the eccentric hub (2).
Rotate the eccentric hub (2) to obtain the correct chain tension.
Turn counter clockwise to tighten the chain; clockwise to loosen (from chain side).
Important
An incorrectly tensioned chain will lead to accelerated wear of the transmission components.
If the screws (1) are removed, lubricate with specified grease underhead and thread, then tighten the screws (1) to the torque of 35 nm +/- 5% (sect. 3 - 3, Frame torque settings) proceeding with sequence 1-2-1.

Warning
The correct tightening of the fixing screws of the eccentric hub is essential for the safety of the rider and the passenger (sect. 3 - 3, Frame torque settings).
Refit the rear splash guard (sect. 7 - 13, Refitting the swingarm).
Adjusting the steering head bearings
Checking brake pad wear and changing brake padsFootrest brackets
Rubber footrest
Right front footrest
Pin
Spring
Circlip
Right footrest bracket
Screw
Washer
O-ring
Bush
Rubber pad
Right rear footrest
Pin
Ball
Spring
Plate
Screw
Vibration damper mount
Special screw
Front lh footrest
Left footrest bracket
Left rear f ...
Removal of the rear brake disc
Remove the rear eccentric hub (sec. 7 - 13, Removal of the rear wheel
eccentric hub and rear wheel shaft).
Undo and remove the four fixing screws (13) of the brake disk to the wheel axle
and remove the rear brake disk (14).
Loosen the four screws (24) and remove the rear phonic wheel (25). ...
Refitting the front mudguard
Warning
Do not use the motorcycle without the front mudguard fitted to avoid
the risk of the brake pipes fouling the wheel on
braking.
Insert the screws (5) in spacers (6) with recommended threadlocker, as shown
in the figure.
Position the front mudguard (1) and start the special screws (5 ...