I only say this from seeing it a few times. Once my friend, an experienced A rider and pro mechanic, used one of those Twin Air air boot covers and washed his KTM air box. Well, unknown to him it leaked and filled the lower end partially with water. He didn't try to start the bike after washing so the water sat for a few days. Soon after he discovered this and got the bike running, it developed a roar from the lower end, classic bad main bearing. What happens is the steel races/balls/rollers rust very fast, then its all over. Saw the same thing after a mass river drowning in an enduro back in '99, lots of parts sold soon after. I flushed my KTM out with gas when I got back to the truck and with diesel later at home after pulling the top end, no problems then. I did not attempt a restart with a low end full of silty river water.
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