Position seal (18) in tank cap (10) as shown and reassemble following the removal procedure in the reverse sequence.

In particular tighten the screws (17) to a torque of 3 nm +/- 10% (sect. 3 - 3, Frame torque settings).

Removal of the fuel tank filler cap
Replacing the tank flange and fuel sensorRemoval of the control unit
Loosen the screws (1) and remove the relay supporting bracket (2), disconnect
the connectors (3) and remove the control
unit (4) from the vehicle.
...
Timing system
Central external cover
Air filter
Horizontal cylinder timing belt cover
Screw
Filter support
Screw
Washer
Nut
Tensioner pulley assembly
Circlip
Camshaft pulley
Tensioner pin
Idler pulley assembly
Timing belt
Nut
Key
Spacer
Camshaft pulley
Driveshaft pulley ...
Refitting the starter motor gear
Position the washer (20) and the gear (19) in the pin (21) and take the pin
into contact with the crankcase half.
...