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I just repowered my 1972 13 sport, went with a Honda 40 power trim@tilt. used a transom adapter from 15'' to 20'' from a company in mass. nice heavy aluminum molded plate that really stiffened up the transom very nicely. I do a good amount of watersports with the boat so I went with the 40, if I was just driving around the lake I think the 30 would be just fine. with the adapter plate I have less backwash but anyone who has driven a 13 just knows how to come off plane. no regrets on my setup. top speed I would say is 35mph