This insanely engineered Honda 750 NR engine. It has an oval piston V4 with 8 valves and 2 connecting per cylinder. : r/Honda
1992 Honda NR750 With 5 Kilometers – Iconic Motorbike Auctions
What Happened to Honda's CRAZY Oval Piston Engine? - YouTube
Honda NR750 Engine. Check out the oval pistons, dual connecting rods, and a ton of valves. Share it with your friends, not… | Engineering, Honda, Cool motorcycles