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 Alcyon - 350 SS 4 HP Super Sport
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Alcyon SS 4 HP Super Sport  motocyclette motorrad motorcycle vintage classic classique scooter roller moto scooter
Photo ou archives : F-M. Dumas

Capacity : 350
Model : SS 4 HP Super Sport
Production : 1928 -
Category : (R) Street Bike


350 Supersport ┬ľ 1928

Twin-cam rarity

Influenced by the Bud1et engines that it had fitted since 1904, Alcyon was among the first motorcycle makers to opt for overhead-valves, initially in racing - with four valves in 1912 - then on its catalogue models in 1927.

Obscure Origins

The origins of the Alcyon marque are obscure. All that is known is that the firm, based in Courbevoie (Paris), was owned by the Gentil family and began, like many other companies, by making bicycles. But the actual connection between Z├╝rcher of Courbevoie and the ancient firm of Z├╝rcher & Luthi (ZL) from Saint-Aubin (Switzerland) - and later known as Zedel with a branch company at Pontarlier ┬ľ is unknown.

Advanced Engine

It's likely, however, that Z├╝rcher of Courbevoie was the fruit of the acquisition of Zedel-Pontarlier by the Gentil family in 1923. It's definite that, in 1924, Alcyon began exclusively fitting Z├╝rcher engines, first two-strokes and then, in 1927, three four-stroke units of 175, 250 and 350cc. All these Z├╝rchers were single-cam pushrod engines with external flywheels, single exhaust pipes and hemispherical cylinder heads. Alongside these engines there was also a two-cam pushrod Z├╝rcher 350 with internal flywheels. This was fitted, with a forward-mounted magneto by Thomann and Labor (two marques belonging to the Gentil group), but not a single Alcyon catalogue depicts a machine so equipped. It nevertheless existed, and at least two twin-cam Z├╝rcher-powered Alcyons survived, though with rear-mounted magnetos.


Engine: 346cc (70x90mm) air-cooled single-cylinder four-stroke

Power Rating: 10 hp

Valves: overhead

Fuel System: carburettor

Transmission: Bridier-Charron 3-speed, multi-plate clutch, chain final drive

Suspension: leading-link forks with friction dampers (front); rigid (rear)

Brakes: drum (front & rear)

Wheels: wire (front & rear)

Weight: 198 lb

Maximum Speed: 60 mph

Not featured in the Alcyon catalogue, this Z├╝rcher-powered Alcyon with internal flywheels is an exceptionally rare and elegant machine.

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.