Looking at a known good one is just about always the quickest way to find out what is wrong, David, so that seems to be heading in the right direction. There is a very good chance the engine you bought did not receive its predelivery inspection, which I think is what Honda was hinting at. Once you know what is wrong, asking the dealer who sold it to you to put it right on warranty seems to be the solution here. That way you come out of it with the warranty still in operation.
