Editing Flat engine (section)

==Motorcycle use==
Flat engines offer several advantages for motorcycles including a low [[centre of mass]], low vibration, suitability for shaft drive, and equal cooling of the cylinders (for air-cooled engines).<ref name=English /><ref name=Szymezak1>{{cite web |last=Szymezak |first=Pascal |title=Début de la légende |url=http://fgwcf.org/rever/debut_legende.asp |work=La saga GoldWing |publisher=Fédération des GoldWing Club de France |language=fr |access-date=2013-12-20 |url-status=dead |archive-url=https://web.archive.org/web/20131219232421/http://fgwcf.org/rever/debut_legende.asp |archive-date=2013-12-19 }}</ref> The most common design of flat engine for motorcycles is the boxer-twin, beginning with the 1905 Fée flat-twin engine, manufactured by the Light Motors Company, which was the first production motorcycle engine.<ref name=TMCfuture>{{cite journal |date=1916-10-05 |title=The engine of the future |page=283 |journal=[[The Motor Cycle (magazine)|The Motor Cycle]] |publisher=Iliffe & Sons Ltd.}}</ref> [[BMW Motorrad]] have a long history of boxer-twin motorcycles, beginning in 1923 with the [[BMW R32]]<ref name=English />

Several motorcycles have been produced with flat-four engines, such as the 1938–1939 [[Zündapp|Zündapp K800]] and the 1974–1987 [[Honda Gold Wing]]. In 1987, the Honda Gold Wing engine was upsized to a flat-six design.<ref>{{Cite web |title=Overview – GL1800 Gold Wing – Touring – Range – Motorcycles – Honda |url=https://www.honda.co.uk/motorcycles/range/touring/gl1800-gold-wing/overview.html |access-date=2024-10-09 |website=Honda UK}}</ref>