I know what the YPVS did and I know what VVT is. While the YPVS rotated a cylindrical valve, my point was that this technology was pioneered by Yamaha. They are not new to the game, they invented the game....even if it was originally a two stroke application. The concepts are both similar and Yamaha has continuned to develop the technology.
Mike
Mike, Fiat was the first manufacturer to patent a functional variable valve timing system which included variable lift. Developed by Giovanni Torazza in the late 1960s,(US Patent 3,641,988).