oil change

So just completed an oil change, new filter new oil. Test drove it a bit. Replaced the head gasket. But when I checked the oil, it’s milky like water is in it. Does anyone have any idea what could be wrong? It’s a 1980 CB750C

Clutch was slipping yadda yadda, i bought new plates all 14(?) of them, excluding the double plate for my '78. While i'm inspecting the old friction plates i notice that the material is nearly gone on some of the friction plates. I had also noticed the oil light coming on while the motor is...

Alright, super noob question. I am a handy guy, so purchased CB750 F SS 1981 in order to learn how to work on it. Very first order of business is an oil change, right? Got the Honda GN4 10W-30 and the HiFlo oil filter and the rubber washers and some metric sockets and wrenches. Ready to go...