I'm wondering when a manufacturer will produce a sport machine with a multi-cylinder four stroke powerplant. Maybe Kawasaki's 500cc fourstroke twin from the low end Ninja or an inline four if it would fit. I don't know how much bigger than 660cc's we'll see in a single cylinder format. I've seen a Mojave with a Ninja 250 twin fit in and a custom header. A four might be too wide/heavy but an all aluminum twin would be interesting.