What is the golden displacement for motorcycles?

[ORicardo]

250cc motorcycles were once referred to as the golden displacement in the domestic market. Motorcycle displacement categories: Motorcycle displacements are classified as: ultra-lightweight (below 100cc, typically 50-90cc), lightweight/small displacement (100-150cc), medium-small displacement (200-400cc), large displacement (500-900cc), and liter-class large displacement (above 1000cc). Single-cylinder engines: The single-cylinder engine represents the most primitive form of all engines and remains the most common type today. All multi-cylinder engines can be viewed as combinations of single-cylinder engines arranged in different configurations. Twin-cylinder engines are further divided into parallel twins, V-twins, and opposed twins, with varying angles and orientations - the most common being parallel twins, longitudinal V-twins, and boxer engines. Four-cylinder engines come in inline-four and V-four configurations, primarily equipped in sport naked bikes or sportbikes.