What I find funny Dick, is how strongly you defend the rotary valve. I'm not arguing against it, but I have a hard time believing in its superiority. I suppose at one time is was a superior design or that old Kaw 100 wouldn't have been as powerful as some 250s.

I have got to believe that today if it were possible to make a rotary valve engine produce significantly more power the Japanese would find a way to incorporate it into their works bikes without having any ergonomic issues. For these guys money is no issue, but having a winning advantage is.

Interestingly, I've seen some cable actuated device called a power valve on bikes recently....I think they were 4-strokes, but I'm not sure. I'll have to go back and have another look.

Wiz