VFR1200XÂ’s 1,237 cc 16-valve Unicam V-4 engine is a spectacular example of HondaÂ’s best engineering.Boundless exploration. The VFR1200XÂ’s 1,237 cc 16-valve Unicam V-4 engine is a spectacular example of HondaÂ’s best engineering. Case in point: the 2 rear cylinders are closer together than the front two, making the engine narrower where your legs are. Clever.