I chose the EX500 for a couple of different reasons. I needed a twin cam, rocker motor and this is that. I originally thought I would use a current MX engine, KX250F etc, but those have half of the cylinder liner inside the crankcases and it wouldn't work easily, and few had rockers. I wanted a twin, ok, its like 40% more work to build, but it showcases that this does not need a sealed crankcase for each cylinder, and actually has much less pumping and windage in the crankcase. I needed rockers because of the short duration, you can only have low valve lift, so a rocker increases the possible valve lift through it's ratio increase, the EX500 has 1.38:1 ratio. I have an investor interested in me doing this with a Suzuki GSXR 1000, I would do the engineering, design and prototype. Would be a fun motor I think, would sound like this engine though because of the typical 180 degree crank, it would fire two cylinders at a time. The newer 1000 cc bikes have 90 degree cranks, so that would change it a bit. But a rocker design base engine is still better, so will look into that.
_________________ 1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.
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