Editing Flat-four engine (section)

== Use in motorcycles ==
{{See also|Motorcycle engine}}
[[File:Glengine.jpg|thumb|[[Honda Gold Wing|Honda GL1000]] ]]

Most motorcycles with four-cylinder engines use a [[straight-four engine]] layout, however, several flat-four engine engines have been used in [[Drive shaft#Motorcycle drive shafts|shaft drive]] motorcycles:
* 1938–1939 [[Zündapp|Zündapp K800]] (air-cooled)
* 1974–1987 [[Honda Gold Wing]] (liquid-cooled)
* 1955–1956 [[Wooler (motorcycles)#Post WW2 motorcycles|Wooler 500cc]] (air-cooled)
* 1981–1982 {{ill|BFG 1300|fr|BFG (entreprise)}}, using the air-cooled [[Citroën GS#Mechanics|Citroën flat-four]] car engine. Approximately 450 were built, with one quarter of these purchased by the French police.<ref name=CitroenetBFG>{{cite web|author=Julian Marsh |url=http://www.citroenet.org.uk/miscellaneous/bfg/bfg.htm |title=BFG and MF motorcycles |publisher=Citroenet.org.uk |date=2000-06-10 |access-date=2011-12-06}}</ref><ref name=CitroenetBoxer4>{{cite web|author=Julian Marsh |url=http://www.citroenet.org.uk/passenger-cars/michelin/gs/flat-4/engine.html |title=GS & GSA boxer engine |publisher=Citroenet.org.uk |access-date=2011-12-06}}</ref>