Thanks to all
Maine Sail: I read what you posted on the Yanmar site, which is why I was asking for real world advice on this site. (by the way, my previous boat was an Ericson, and I was a frequent reader of your elaborate postings on the Ericson site. Glad to know you peruse this site as well).
Stevemac: Thanks for the input from Larry Berlin. I had forgotten his name, but he is the person who certified the installation of the engine in my boat. I will give him a call about this. Note that the Yanmar site says that the prop size DOES matter.
Another question: what speed does the boat cruise at????
First Sight PS31 #128