Honda NSS250 2007 Owner's Manual page 119

Belt Case Air Cleaner
6. Inspect the element for cracks or tears
in the foam or seams. Replace the
element if it is damaged.
7. Allow the element to dry thoroughly
before installation.
Do not apply oil to the element. The drive
belt may be damaged.
8. Install the element.
9. Install the element cover.
10. Install the belt case air cleaner assembly.
11. Install the removed parts in reverse
order of removal.
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Servicing Your Honda