Oil leak

[airplanenut]

I am new to the outboard world. I bought my son a used 4 hp Chrysler for his fishing boat. It has a oil leak, I'll say half way down the shaft. Is there some type of seal or gasket that is leaking or maybe the lower end oil to full? And also after idling the engine down with it in gear it seems to always die. Maybe I just haven't figured out all the quirks with it yet but I found this site and thought someone might know.