Water in my honda dirt bike exhaust?

So I let my little brother wash down my honda crf 80 and apparently he used the hose and sprayed water in the exhaust but I am not sure how much water. It took about 25 kicks to start it and then it had trouble idling for about 10 minutes and it immediately died when I gave some gas. After the 10 minutes it seems to run ok now?.. Do you think there could be any permanent damage to the engine?
 
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