BMW Motorrad R 1250 GS Adventure 2022 Rider's Manual page 209

Remove screws 1.
Loosen the cover 2 on both
sides.
Remove screws 1.
Remove air filter cover 2.
Remove frame 3.
Remove air filter insert 4.
Checking air filter insert
Check air filter insert and
clean if necessary.
Replace heavily soiled air filter
insert.
Installing air filter insert
Clean air filter element 4 or
replace, if necessary.
Insert air filter element 4 and
frame 3.
Put air filter cover 2 in place.
Install screws 1.
Air filter cover on intake
silencer
Tightening sequence: Tighten
crosswise
203