RE: Old Bipe
A 91 may be a little much. however, you do not have to use all that power all the time. I had a Wayfarer about 15 years ago and it was powered by an old Supretigre 60. It flew just fine, but that old tigre put out about as much power as one of the hot 46's of today. In my opinion, a 72 four stroke would be perfect. The Wayfarer was a good looking and good flying bipe. Enjoy and good luck.