I just bought a '04 WR450 and am in the process of stripping it down to clean/lube, and learn my way around the bike. When I removed the air filter cover water poured out, I mean there was a pint in there!
Looks to be a vent hose routed from the cylinder head into the airbox, don't know if that is were it came from or from the intake port under the seat.
Scared the crap out of me as the air filter was sitting in water.
Is this normal?, or did the PO dump it in the middle of a stream? If left out in the rain could this happen? We have had some torrential rain here lately.