Water running from overflow tube yzf400

Upon startup and during riding water pours out of the overflow tube until the radiator is empty? is this normal? I changed the radiator cap and made no difference.

whats wrong? don't want to overheat!

Sounds like a head gasket

does the water mix with the oil like in a car and turn milky?

Not necessarily, but it can. Depends on where exactly the combustion leak is.

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