Pretty darn cool!
Personally, I think off-the-shelf engines are easiest and simplest. Someone else has already done engineering and hard work ahead of time. Someone's put a Honda CR250 engine in Ninjette. Also RZ350 engine too I think. With turbo! Only saw this being built-up, don't know if it was ever completed.
Also there's 4-part series on YouTube about turbo EX500. Guy supposedly had done numerous ZX10Rs and Hayabusas previously. So EX should be simple.
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