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Honda CB500R Racer

This CB500R racer was developed in the highly secretive Honda Research & Development Department in Saitama, Japan. Despite its model name it actually has a displacement of 651cc thanks to a bore/stroke of 64 x 50.6mm – and it produces an impressive 80bhp at 10,700 rpm. Internally, the engine features of a lot of bespoke parts, many of them magnesium, and an unusual (for Honda at the time) dry clutch. The block is sandcast and has a magnesium valve cover, the cylinder head was reworked to give it larger inlet ports and bigger valves, stiffer valve springs and hardened valve seats so it could run unleaded fuel.

With the high-compression pistons, an electronic ignition, a close ratio 5-speed transmission, a chrome molybdenum 25mm double cradle frame, and 31mm Keihin CR carburettors, this CB500R was a test bed for many technologies that would later become standard across the range of Honda bikes (and all bikes for that matter).

Source silodrome.com