I had a Virus 7...
...in my old C&C 25 MkI. I had some problems with it, so I bought someone elses failed rebuild and used the parts to rebuild mine. Took me all of about four hours which included lapping the machined surfaces.As was previously stated, these are no longer produced. They were never actually manufactured by Westerbeke, but were manufactured in Denmark by Valmet. If you ever had a problem with them and called Westerbeke they wouldn't want to know you.They are indeed simple engines to work on. One mod that I made was replacing the conventional ignition system with electronic ignition. The conversion kit can be purchased at any lawn equipment supplier.Cheers,Bob