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White smoke out of breather and exhaust

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I have a 2005 yz250f. I was riding on Saturday and I shut it off then went to kick it again and it was blowing white smoke out of the breather hose and the exhaust. It only does it when the bike gets hot. I pulled the head off today and top of piston looks good just has some carbon built up and the cylinder looks good also. Any ideas of what it could be? 

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