Correction ... that is a Honda NR500, not a NSR500.
It's a 500cc engine. At the time GP motorcycle racing rules said no more than four combustion chambers ... so Honda built a 500cc "V8" by using a common combustion chamber covering what would normally be two cylinders .. making it technically a four cylinder with eight valves per cylinder.
Raced a few times, not very successfully. The road going version was the most expensive to produce motorcycle ever sold to the public.
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