Back Inlyntweesilinder Afrikaans Motor bicilíndric en línia Catalan Parallel-Twin German Motor de dos cilindros en línea Spanish موتور دوسیلندر خطی Persian Moteur bicylindre en ligne French Mesin 2 silinder segaris ID Motore in linea a due cilindri Italian 直列2気筒 Japanese 2기통 직렬 엔진 Korean
A straight-twin engine, also known as an inline-twin, vertical-twin, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include automobiles, marine vessels, snowmobiles, jet skis, all-terrain vehicles, tractors and ultralight aircraft. Various different crankshaft configurations have been used for straight-twin engines, with the most common being 360 degrees, 180 degrees and 270 degrees.