The cabin’s fresh air intake will collect acorn tops, seeds, leaves, and other debris. One suggestion is to put a screen over it:
http://www.ohiodeloreans.com/gallery-TipsTricksMods.htm
I removed the windshield grill, and vacuumed out debris:
I had some scrap fiberglass screen on hand, and set it with a few dabs of RTV.
After reinstalling the grill, I’ll trim the screen. I also cleaned the fragile, broken grill:
I also discovered I was missing all but one of the rubber stands used to hold up the windshield grill. I found some nylon bushings at Ace Hardware that are the exact height:
Costs:
Screen: On Hand
RTV: On Hand
Nylon bushings: (7 @ $0.33) $2.31 at Ace Hardware