coolant in oil

I need help on my yzf426. My oil is real milky lookin. I have changed the oil and it is still the same. It still runs strong but pours water/antifreeze out of over flow hose when it is reved up. What could cause this?

Maybe a head gasket?

Your head gasket needs replacement. Then you'll need to thoroughly flush your oiling system.

Your head gasket needs replacement. Then you'll need to thoroughly flush your oiling system.

And while you're in there, replace your cam chain if you haven't done it in the last 40 or so hours.

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