Oil being lost through the hose out of the head

Can anyone help me I have a 07 YZ450F I have tried everything, like changing the oil along with the oil filter along with trying to clear the chambers where the oil passes through but oil keeps being lost through the hose at the top of the head. Does anyone know why this keeps happening. :thumbsup:

how much oil? A little oil will blow out of the breather. Check for another pinched line. If oil is pouring out the return passage way in the head may be clogged.

When you change your oil and filter, do you drain from both drain plugs? How much do you put back in?

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