Steady smoke or steam from breather tube

I have an 07 yz450f. Recently there has been smoke or steam coming from the breather tube at the bottom. Comes out when ever you give it throttle. Does anyone have any ideas what it could be? People we talked to think there may be to much oil. I have checked the manual and made sure I put in the right amount. I may have still put too much in.

I have an 07 yz450f. Recently there has been smoke or steam coming from the breather tube at the bottom. Comes out when ever you give it throttle. Does anyone have any ideas what it could be? People we talked to think there may be to much oil. I have checked the manual and made sure I put in the right amount. I may have still put too much in.

 

It could need a new top end, excessive cylinder blow by will cause this.  A cylinder leak down test will confirm or eliminate  this as being the problem..

How do I test for that?

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