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 Horex - 400 Imperator
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Photo ou archives : F-M. Dumas

Capacity : 400
Model : Imperator
Production : 1954 - 1960
Category : (R) Street Bike


400 Imperator - 1954

Advanced twin with an English accent

During the 1950s, Horex occupied a place slightly out of the mainstream of the German motorcycle industry. Its styling was more English than German.

From Jelly Jars to Big Twins

Horex was born during a slack period for a maker of glass jelly jars that wanted to diversify its activities. The first Horex – short for Homburg (location of the firm's head office) and "Rex Konservenglass Fabrik" – appeared in 1924. Until WWII, the firm built a variety of single-cylinder bikes and a vertical twin in 600 and 800cc versions.

Silent Reprisals

During WWII, Horex opposed the Nazis and consequently was permitted by the Allies to resume production in 1950. This privilege was not universally appreciated and the press largely ignored the new models and sporting successes of the Horex marque. The "Imperator" twin was launched in 1954, with its displacement cut to 400cc from the 500cc of the preproduction prototypes. The engine was modern in design, with a single overhead-camshaft driven by a chain passing between the cylinders, and developed 26 hp at 5800 rpm. As for the suspension, the choice was left to the customer, who had the option of a telescopic fork or an Earles leading link better suited to sidecar use. Like all the Horex models, the Imperator distinguished itself in track competitions with its RS version and also off-road with the GS. The economic downturn of the late 1950s was fatal to Horex; output fell dramatically and ceased altogether in 1960.


Engine: 391cc (61.5x66mm) air-cooled parallel-twin four-stroke

Power Rating: 26 hp @ 5800 rpm

Valves: overhead-camshaft driven by chain

Fuel System: carburetor

Transmission: 4-speed; multi-disc clutch; chain final drive

Suspension: telescopic or Earles forks (front); swing arm (rear)

Brakes: drum (front & rear)

Wheels: 3.25x18 inch (front); 3.50x18 inch (rear)

Weight: 432 lb

Maximum Speed: 84 mph

The Imperator was one of the most up-to-date bikes of its day, inspiring a later generation of Japanese machines like the Honda CB450.

Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.