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There is a 20 inch transom adapter built specifically for the 15 inch Whaler transom. You can find it here: http://kentfabrications.com/TransumAdaptor.html

I was going to get one but have decided to go with the 15 inch Tohatsu/Nissan TLDI 40 hp which is 206 lbs. I talked to several people who have this motor on a classic 13 with the 15 inch transom and all are very satisfied. The static trim is fine and the boat handles well despite what many who have no experience with that motor on a classic 13 will tell you.

Good luck, I too have looked long and hard for a good old 35-40 hp light two-stroke.