One reason for no responses may be it has been a long long time sense I have seen one of the Wing 25s built. Even when wing was cutting them you only saw them at fly in shows.
If you want to know something about any of the new gas engines then a good place to look would be the gas engine forum. There are a lot of pages written about the new engines, even the gas four strokes.
Wing MFG was not one of the run of the mill kits that most people were building so you won't get a lot of response.