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 Magnat Debon - 350 BOSSC 2
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Magnat Debon BOSSC 2 motocyclette motorrad motorcycle vintage classic classique scooter roller moto scooter
Photo ou archives : F-M. Dumas

Capacity : 350
Model : BOSSC 2
Production : 1930 -
Category : (R) Street Bike


350 BOSSC2 · 1930

A successful update

Magnat-Debon was an independent manufacturer until it joined forces with Terrot in 1924. The first fruits of this pairing were the 175 and 250cc two- troke 1925 models. On the fourstroke front, Magnat continued building MAG engined machines until 1926. But in 1927, standardization produced a side-valve 350 that was identical to the contemporary Terrots, right down to the shape of the fuel tank.

Distinctive Identity

The distinctive identity of Magnat-Debon was preserved by an overhead-valve 350 with a Blackburne engine. And this identity was maintained until 1932.

New Look

In 1927- and, especially, 1928- the 350 Magnat-Debon-Blackburnes, with flat-tanks and engines with external flywheels, could hardly be called modern motorcycles. The new look came in 1929, with a superb squat and angular saddle-tank, engines with internal flywheels and more heavily-finned cylinders. The silhouette became very modern, particularly in the BOSS2 "Racing" and BOSS2C "Supersport Comfort" twin exhaust pipe versions. In 1930, the fitting of a Blackbume engine wid1 enclosed ohv gear prompted the change of designation to BOSSC2. That was the final modification. The powerful and reliable ohv Blackbume 350, coupled to therobust Terrot three-speed close-ratio box,

endowed the BOSSC2 with an enviable turn of performance - with a domed piston and

running on an equal mixture of gasoline and benzol, it was capable of a genuine 75 mph.


Engine: 34&c (71x88mm) air-cooled singlecylinder

Blackbume type CSC four-stroke; castiron hemi-head; total-loss oiling with manual and mechanical pumps; France magneto

Power Rating: 15 hp@ 4800 rpm

Valves: overhead

Fuel System: Amal carburetor

Transmission: Terror 3-speed, chain final drive

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

Brakes: drum (front & rear)

Wheels: 3.50x19 inch (front & rear)

Weight: 298lb

Maximum Speed: 75 mph


Fast and reliable, the superbly finisbed MagnatDebon BOSSC2 of 1930 bad every modem feature - except dry-sump lubrication.

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.