I think this quote from Ryan's original post probably explains where he got most of his info. It does not explain why he has such a hard-on for 4 strokes.
>There is no conlusion this writing, it is inconclusive- maybe you have an opinion >over what the better type is.
>And if you really must have a source
>Here is one :General Power Mechanics- 1968 Mc Graw hill