But I believe 73 65 horse johnson.
I can definitely say that you can not see see any lil pisser tube or anything up top.
and yowzer after reading thru some of the other posts regarding oils i can definitely say i am using the old stuff too
She runs great, only problem she ever gives me is starting up easily after warming up.
You can get it started but usually have to give it extra gas or play with the choke.
but i was just used to my 50 yammy then when it was warmed up you just turned the key and it started.
Maybe Barnicle Bills with help you out with your question. If you go to their web site they have a parts look up section with schematics. That will show you whats inside of your motor. I'm guessing if it doesn't have a pisser than it probably discharges in the exhaust.