Cannondale ATV Owner's Manual page 140

the area indicated in the photo below. If the filter is
install carelessly, the result may be creating a path for
unfiltered air to bypass the filter.
This photo shows the area where, if the airfilter is installed
incorrectly, the foam element can drag away from the cage
allowing unfiltered air to bypass the filter.
138
10. Apply a small dab or waterproof grease to the end of
the air filter and reinstall the retaining clip.
1. Clip
2. Area to apply waterproof grease
11. Reinstall the removed components.