I bought my first boat 2-3 months ago and everything is good. It has a 1978 evinrude 115hp. It runs really good. Now one of my friends has a 1983 evinrude 90hp. This is the model number: E90TLETS. He is going to give it to me and my question is: how many of those parts are compatable with my motor. Sorry but i'm a newbie with boat stuff.