Ducati MONSTER 821 Workshop Manual page 117

Duly refit filter (2), pre-assembled with cover (3), inside its seat on airbox.
Start screws (1) and tighten them to a torque of 3Nm ± 10%.
Important
If the motorcycle is used in very damp or dusty conditions, the air filter cartridge must be changed more
frequently.
Remove primary pipes from horizontal and vertical head exhaust pipes (Removing the exhaust
system).
Loosen the screws (6) fixing the horizontal belt cover (5), and remove it from the horizontal piston-cylinder
assy.
Loosen the screws (7) and remove the filter (4).
Check air filter (4).
Once the check has been carried out, refit filter (4), start (without tightening) screws (7), and refit the
horizontal timing belt cover (5) on the horizontal piston-cylinder assembly by tightening the screws (6) to a
torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) for plastic covers and 6 Nm (Min. 5.5 Nm - Max. 6.5 Nm) for
carbon covers.
Refit primary exhaust pipes (Refitting the exhaust system), complete with heat guards.
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