V型2気筒
As per other motor vehicles, the terms longitudinal engine and transverse engine are most often used to refer to the crankshaft orientation relative to the frame. However, some companies use the opposite terminology, stating that a "transverse" V-twin engine has the cylinders mounted on each side of the motorcycle (therefore with the crankshaft running in line with the frame) and that a "longitudinal" V-twin engine has the cylinders at the front and rear. The latter terminology is used by the Italian manufacturer Moto Guzzi.