Interestingly I have been out in the floods!! A short cut recently led to me going through about 2 feet of water and I also have been needing to go through about 18 inches of water to get to work. Can water seep into the engine? The filler cap was secure. I am not sure where the air intake is but 2 feet seemed shallow when you see what the professionals do!!
bit surprised by the extent of the gunge and also where it is. normally to be found in a high spot where water vapour rises and condenses. have yopu been using the bike in the floods? green lanes? part immersion? is the oil filler cap secure?