So how's it going with the Vire? Do you have the 7 or the 12? I've got the 12 in my Ostkust and after one season I'm pretty happy with it. The one negative is it's a little loud. Mine had sat for a few years, it was totally plugged up, no cooling water flow at all. It is light enough, though, that two of us could lift it out of the boat and we got it all sorted pretty easily.
That website listed above was very helpful. They are very simple engines really.
The mechanic at the marina I launched in said "That thing shouldn't be in a boat it should be in a museum. "