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 Jonghi - 350 TJ 4 C Racing
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Photo ou archives : F-M. Dumas

Capacity : 350
Model : TJ 4 C Racing
Production : 1932 -
Category : (R) Racing


350 TJ 4C - 1932

Simplicity beats out the complex

Jonghi was a small French marque founded in 1930 by the financier Tito Jonghi and the engineer Giuseppi Remondini, refugee from the competition department of Alfa Romeo and former technical director of two Italian motorcycle companies, Frera and Negas & Ray. The first Jonghis were simply renamed Negas & Ray 350s.

From Small Beginnings

Despite its small beginnings, the Jonghi marque soon made a sporting name for itself: Jonghis, ridden by such experts as Louis Jeannin, Georges Monneret and the Remondini brothers, won the 1932 Rome Grand Prix and Bol d'Or and took a 24-hour world record at an average of more than 72 mph in 1933.

No Secrets, No New Technology

But there was no technological revolution behind the success of the TJ 4; its engine was a classic 350cc four-stroke with either an L-head (65 mph) or overhead valves (84 mph), mounted in a double cradle tubular frame devoid of rear suspension. Its superiority on the track lay entirely in careful preparation. That's often the way in racing, where technical innovation can play second fiddle to meticulous preparation. Jonghi went out of business in 1956, after building some 800 bikes, including a 125cc four-stroke as beautifully made as its 350, a two-stroke cyclemotor and a scooter.


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

Power Rating: 17 hp @ 5800 rpm

Valves: overhead pushrod

Fuel System: carburetor

Transmission: 3·speed hand-change

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

Brakes: drums

Wheels: 19in wire

Weight: 276 lb

Maximum Speed: 87 mph (racing, with benzol fuel , 100 mph)


Classical in its simplicity, the Jonghi TJ 4 was one of the most handsome French racing bikes of the Thirties.


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.