My Ariel was repowered by a PO with a Yanmar 2GM:
Specs: Yanmar 2GM 13 HP @ 3400 RPM, 15 HP @ 3600 RPM
Trans: 2.62:1
Prop: 13x11
Some old threads about my brief history with a Yanmar including prop programs, emails from prop shops, and excellent advice from a previous forum member:
http://www.pearsonariel.org/discussi...Inboard-Issues
http://www.pearsonariel.org/discussi...7-Ideas-wanted
Bill of Periwinkle (A-231) would be a great resource if he is still checking in. He did a wonderful rehab on A-231 and repowered with a 20 HP diesel.
http://www.pearsonariel.org/discussi...231-Periwinkle
Great job on your refit and good thinking on saving the cockpit sole for last!