Moto: 750cc, 32 Valve, Oval Pistoned V4

If you know what this is from, you're down...

It's from Honda's NR500 Grand Prix Racer, per Wikipedia: Whereas the NR500 had used an oval piston with straight sides (above) the road going NR750 used an elliptical piston with curved long sides (below).

While we're on the subject of Honda engines that were strange. Here's a 5 cylinder 125cc.

More old high tech Honda...

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