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FN M12
The FN M12 was a motorcycle manufactured from 1937 to 1940 by the Belgian company Fabrique Nationale de Herstal, primarily for use with a sidecar.〔Guy de Becker, ''Quand la F.N. avait deux roues'', self-published, 1993, p. 151 .〕 1,180 were built, 1,090 of which were delivered to the Belgian military as heavy sidecar combinations.〔Egon Duchateau, Geert Huylebroeck, Nick Jonckheere and Rik Van Eycken, ''Belgische Motorräder'', Lemgo: Kleine Vennekate, 2009, ISBN 978-3-935517-49-2, p. 81 .〕
==Specifications==
The twin-cylinder flathead piston engine of the M12 had 992 cc displacement (90 mm bore, 78 mm stroke). With a compression ratio of 5:1, a 28mm Amal carburettor and Bosch battery ignition, nominal performance was 22 hp at 3000 rpm. Power was supplied to the rear wheel via a universal joint. The top speed of the 240 kg machine was 〔
The military version with a sidecar (M12a SM) had a removable sidecar, a four-speed gearbox with reverse gear and reduction gears and separately operated drum brakes 220 mm in diameter.〔Duchateau ''et al''., p. 68.〕 The FN M12a was introduced to the public in extensive use at an international military competition in July 1938 in Spa, Belgium. In 2012 an article in ''Motorrad Klassik'' described this combination as "vastly superior to all military motorcycles with sidecar".〔''Das FN-Gespann war allen Militär-Motorrädern mit Beiwagen haushoch überlegen'' Frank-Albert Illg, "FN Typ 12a S.M.", ''Motorrad Klassik'' 2/2012, pp. 14–23 〕
The FN M12 engine was also used in the Tricar 12T-3 three-wheeler.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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