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 Norton - 500 TT 25
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Photo ou archives : F-M. Dumas
4306

Capacity : 500
Model : TT 25
Production : 1926 -
Category : (R) Racing

NORTON

500 Model TT 25 Replica -1926

Never-ending success

Designed by the firm's founder, James Lansdowne Norton, the first overhead-valve Norton was built in 1921. In 1922, Rex Judd set a British one-way flying kilometer record of 98.76 mph and a two-way world record of 89.92 mph on the new model at Brooklands.

First Victory

Only one prototype overhead-valve Norton took part in the 1922 IT, but its rider fell off on the last lap. But at the end of the season, Hubert Hassall placed second in the French GP and third in the Belgian GP and gave the model its first victory in the Ulster GP.

Record of Success

Poor brakes cost the ohv Norton (now known as Model 18) the 1923 TT, so Norton's new designer Walter Moore adapted 8 inch brake drums from the latest Model T Ford. Alec Bennett won the three major classics, while two future car aces - Tazio Nuvolari and Achille Varzi - won the Italian Circuit of Cremona and the Spanish GP. In 1925- the year of "Pa" Norton's death – Bennett won in Belgium and Joe Craig in Ulster. The following year, a more modern Norton bike had pannier tanks. Roadholding was excellent, and the bike was endowed by Moore with an oil pump and two large drum brakes. Irishman Stanley Woods joined Norton in 1926 and won the Senior IT at a record speed of 67.54 mph: in the fall, Norton offered replicas of Woods's machine under the designation Model 25. Alec Bennett won the French GP again in 1926 on his 500cc Norton, but for 1927, Moore created the first overhead-camshaft Norton, the ES2.

SPECIFICATIONS

Engine: 490cc (79xl00mm) air-cooled singlecylinder four-stroke; dry-sump lubrication

Power Rating: 30 hp @ 5800 rpm

Valves: overhead

Fuel System: Binks or B & B carburetor

Transmission: Sturmey-Archer tank-shift 3-speed, chain final drive

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

Brakes: drum (front & rear)

Wheels: 19 inch wire (front & rear)

Weight: 287 lb

Maximum Speed: 90 mph

 

The Model 25 - otbervise known as the TT Replica - had an early form of saddle tank, created by sandwiching the top tube between two separate pannier tanks.




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.