if its not broke don't fix it!!
Do your self a favor, get yourself a repair manual for that motor!! The single best thing you can do for yourself!!
Not trying to sound like we no want to help you!! But if you don't no the motor you have no business under the cover!!
Once you have a reference to go by, and can identify parts then we can help you, all you need!!
www.iboats.com is a great place for questions and I am sure they will tell you the same!