Ducati 998 2002 Mode D'emploi page 121

Remove the filter (2, fig. 44) from its seat on the inner
cover (3).
Clean the filter cartridge with compressed air or fit a new
one, if needed.
Important
A dirty filter will reduce air intake, increase fuel
consumption, reduce engine power, and foul the spark
plugs. Do not use the motorcycle without filter or
suspended matters could get into the engine and cause
damage.
Install the filter properly into its seat on the inner cover
and refit all the parts you have removed.
Important
If you are using the motorcycle on dusty or very
wet roads, replace filter more frequently than
recommended intervals shown in the routine
maintenance chart (see Warranty Card).
4
3
2
(998)
1
E
fig. 44
43