Undo the circular clip on the air intake, use a 7mm socket or phillips screwdriver
Undo the six, Phillips retaining fixings
Carefully lift away the air filter body
View of the air filter cover
Clean off any debris on the surface of the filter. Replace with a new filter if heavily contaminated
Check air filter box for debris. Clean out if required. Replace air filter
Reassemble the air filter housing. Job done!