What engine??? It would be a whole lot easier to help you if you gave us info like engine brand, numbers etc.
#3
Scrubcadet10
I think it uses a Kawasaki FH 2 cylinder,or an FS 2 cylinder depending on the year model.
First thing i would do is clean the engine real good. Especially where the oil leak is evident.
Brake parts cleaner is good at cutting the oil and dirt.