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The device on my friends old James 197 bike is a reed valve inserted between the carb and the inlet manifold. Reed valves were not new so that was not my invention but nobody before had positioned it in that way and it therefore became a "bolt on goodie" adaptable and available for any machine. Of course the reed valve assembly had to be designed and built, and I am sorry that I could not show you any photos of it. Interestingly. Many two strokes now have some method of achieving asymetrical porting and the reed valve is one way of doing this and many including Yamaha fit it in the way that I did all those years ago. I guess that I should have patented it, :)