The MV Agusta F4 750 is a reminder of how much a motorcycle can change without abandoning four cylinders in one line. An inline-four describes the cylinder arrangement. It doesn't prescribe capacity, crankshaft design, engine speed or the way the power reaches the back wheel. A later four-cylinder MV may share that layout while being a very different engine and a very different motorcycle.
The original F4 750 family belongs to MV Agusta's modern sporting heritage. Set it beside the Superveloce 1000 Serie Oro and base Rush 1000 and the differences in generation and purpose become obvious. MV's own Superveloce specification identifies a 998 cc four-cylinder engine, while its Rush technical sheet identifies a four-cylinder, 998 cc base model. Neither figure belongs on an F4 750 specification sheet, and special-edition Rush variants need their own evidence.
A V4 arranges its four cylinders in two banks; an inline triple lines up three cylinders rather than four, yet that is just the start of the comparison. MV's faired F3 RR and naked Brutale 800 also demonstrate how engine calibration and the motorcycle built around it change the rider's priorities. Before making claims about sound, smoothness or race performance, establish which exact engine and model year are being compared. Shared layout isn't shared behaviour.