Water/Oil-cooled 4-cylinder 4-stroke In-line Engine, Four Valves per Cylinder, Two Overhead Camshafts Liquid-cooled, 4-stroke In-Line Four ...

Air/liquid-cooled four-stroke flat twin engine with double overhead and chain driven camshafts (BMW ShiftCam) and balance gear wheels Liquid-cooled, 4-stroke In-Line Four ...