Re: Which Evinrude should I buy? 1977 25 HP or 1976 15 HP
I'd opt for the 15. Should plane your boat just fine w/2 people, much better on fuel, idles wicked slow for trolling.. much slower than the 25 will. You may need to clean up/reset the points on the 15, and use B7HS NGK plugs gapped to .030"... should be good to go for many years. Also, depending on the mood of your local conservation officer, you can get a ticket for an 'unsafe' HP on your boat if you use the 25hp on a boat rated for 20 max..
Good luck!