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 Gilera - 250 Nettuno course
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Photo ou archives : F-M. Dumas

Capacity : 250
Model : Nettuno course
Production : 1948 -
Category : (R) Racing


250 Nettuno -1948

Affordable sporting machine

Gilera is so well known in competition history for its 500cc four and its Satumo 500 that its achievements in smaller-capacity classes are sometimes overlooked. These, however, were numerous, not least with this rare "client-competition" version of the Nettuno.

A Scaled-Down Saturno

Introduced in 1946, the Nettuno was an exact scale replica of the renowned 500 Saturno, which had been created in 1937. It had the same design of unit-construction overheadvalve engine, foot-change gearbox and the famous rear suspension introduced by Gilera in 1934. This was an original and efficient system where the swinging fork had vertical levers at the forward end to give an L-shaped profile. The levers had upper links that pulled against horizontal springs beneath the saddle. Classic Rudge-Whitworth friction dampers formed the fourth side of the rectangle.

A Rival for the Guzzi Airone

The overall layout was typical of the Italian school, always a step ahead of the British preference for separate gearboxes and Germany's attachment to rigid rear ends, which would remain the case until well after the war. Some 3700 Nettunos were built between 1946 and 1954. Up to 1952, the Nettuno was available in Turismo and Sport versions, the main difference being their cylinder heads - the Sport had a light alloy head - and the respective top speeds of 62 and 78 mph; the rare competition version could reach 87 mph.


Engine: 147cc (68x68mm) air-cooled singlecylinder

Power Rating: 14 hp @ 6000 rpm (Sport)

Valves: overhead pushrod

Fuel System: Dell'Orto carburetor

Transmission: 4-speed; chain final drive

Suspension: girder forks (front); swinging fork (rear)

Brakes: drum (front & rear)

Wheels: 19 inch (front & rear)

Maximum Speed: 87 mph


This exceptionally rare client-competition Nettuno has been fitted with a more modern tank and dual saddle during its long racing career.


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.