A flat-four engine has 4 cylinders arranged within an opposite direction alongside a typical crankshaft. The pistons move from one another at the same time. Illustrations are Honda CB750 and BMW K1200RS. The bar ends are angled extensions that connect towards the finishes of some flat handlebars or riser handlebars https://dantefpyfm.mybuzzblog.com/14821560/the-ultimate-guide-to-bike-parts-diagram