2005 yz450f oil coming out of my blow by tube

Do i need to do a top  end rebuild? Are the o rings going bad? To much oil? Sorry i'm  a bit ignorant on this subject

If you don't own a service manual, you should

 

Your valve cover breather will spew oil if:

 

You ride at top rpm for 3min or more

You wheelie alot

You don't let all the oil drain out when you change oil, therefore your oil level goes up with each oil change

You overfill your oil

Your rings are shot

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