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Uh wait, how are emissions standards pushing compression ratios down? CBR-1000RR is at 13:1. NOx aftertreatment is mandatory, not an option.
I did forget the earlier bikes were carbed and have no cats, so that's one less handicap to make up for the poor fueling control. Still, if the ZX6R is making 200 hp/L, I was hoping for the same from the ZX25R. I guess it's hard to win against friction.
I would think that gear driven camshafts are actually more likely because the stroke is short. It probably has around 35mm stroke, 75mm of connecting rod, so it's around 115mm to the valves from the crank, which I would think you can span with a single gear.
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