Firstly, release the air breather pipe
Undo the circular clip on the air intake - use a 7mm socket or phillips screwdriver for this
Now release the air intake
Undo the 5 Phillips retaining fixings
Carefully lift away the air filter box
Clean off any debris on the surface of the filter. Replace with a new filter if heavily contaminated
Check the air filter box for debris. Clean if required. Replace the air filter
Reassemble the air filter housing