Sealing airbox from water

Any secrets on closing up sides and back to keep water from getting in air box. cr250

So I had a lot of problems with this. Make sure the fender and air box are in the proper ontop of each other.  Airbox on top of the fender, the other way around and it can be bad.  The big open hole on the bottem of my 97 I originally foamed up, but that didn't work as its a drain hole and bad things now I have a big hole drilled in it so water can drain.  The sides I don't know how to block off, I consider that the high point on the bike now for water.  Mostly a good air filter with lots of oil on it seems to work well for me.

My 1992 Honda CR 125 have a big square hole in the bottom too.Must be there a hole?

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