It does look like a revised cylinder but I think this patent is all about that piston design. That is not just 250r innovation that is 2 stroke engine innovation. I remember reading a comment that he made awhile back about something that he has been working on for over 30 years, I would guess that this is what he was talking about. He has been posting about riding and testing a lot over the last few years and has a new pipe design out too. Eddie has been busy and more focused on the manufacturing for years but those of you that don't believe that he can make an engine run are wrong.