2001 with a K&N.
I clean the filter at each 3k oil change.
I usually find bugs, sometimes feathers, once raccoon hair, (don't ask).
But this time there was a substantial amount of sand in the incoming side of the airbox. The filter was not that dirty, but I could pick up sand with my fingers.

What do you see when you remove the filter /airbox cover? I wonder if it is because it is harvest season around here.

1. Sand in airbox can be a direct result of riding with front tire on ground.
Elavating air intake to eye level will lessen chance of further sand collection.
2. Do not park bike in kid's sandbox.

Crazy Dave----I have never heard it said any better-----happy trails kel