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 FN - M 14 bicylindre
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FN D2-492-56-13
Photo ou archives : archives FMD

Capacity : 500
Model : M 14 bicylindre
Production : 1937 -
Category : (R) Racing


500 M14 Twin / Grand Prix - 1937

Belgian blower

When people praise the latest technologies from Japan, it's worth reminding them that many of those ideas were born years ago in Europe: in Great Britain, France, Germany, Italy – and in Belgium.

Return to Multi-Cylinders

A pioneer manufacturer of four-cylinders in 1904, FN stopped making multi-cylinders in 1926, but resumed in 1937 with the M12 flat-twin and this fabulous M14.

Supercharged Twin

This V-twin, with a Roots-supercharged unit-construction engine in light alloy, succeeded the overhead-camshaft 500 single that was being outclassed in GPs. Its layout was unorthodox. Each cylinder/head unit had its own dedicated chain-driven camshaft. The M14 appeared at Spa-Francorchamps, ridden by René Milhoux, in July 1937, but broke its gearbox. It achieved its first success in October 1937 at Montlhéry, where Milhoux and Charlier established four world sidecar records, using a package carrier ballasted with sandbags. However, FN was becoming more involved in the newborn discipline of motocross. The M14 only appeared spasmodically in 1938 and 1939, placing in events such as the Coupes de la Meuse, Coupes de l'Armistice, 24-Hours of Schaerbeeck and Paris-Nice. It achieved its finest international result in 1939 in the European Grand Prix at Spa-Francorchamps, where Ginger Woods finished fourth at 88 mph.


Engine: 498c (60x88 mm) air-cooled dry-sump twin-cylinder four-stroke; magneto ignition

Power Rating: 48 hp @ 6,200 rpm

Valves: separate chain-driven overhead-camshaft per cylinder

Fuel System: carburetor; Roots supercharger

Transmission: 5-speed, multi-plate clutch; chain final drive

Suspension: girder forks (front); rigid (rear)

Brakes: drum (front & rear)

Wheels: 3.00x21 inch (front); 4.00x18 inch (rear)

Weight: 383 lb

Maximum Speed: 125 mph

The FN 500 twin in record-breaking guise

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at for conditions and copyright.

© Tous droits réservés
François-Marie Dumas

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