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 BSA - 250 B 25 SS
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Photo ou archives : F-M. Dumas

Capacity : 250
Model : B 25 SS
Production : 1971 -
Category : (R) Street Bike


250 Gold Star / B25SS - 1971

The final BSA 250

13SA had been the lt:leading British marque, but was at its last gasp in 1971. In a final desperate attempt at survival, it unveiled a series of 250 and 500cc singles. The renewal began with the Barracuda and Starfire.

Sporting Roadsters

Developed from the C15 of the 1960s, these attractive sporting roadsters had sleeved aluminum cylinders, redesigned and more robust engine internals and larger valves. All of which raised output to 25 hp at 8000 rpm, a 10 hp/ 1000 rpm advantage over the C15.

Street Scrambler

The B25SS and T325T off-road versions adopted the angular style of the latest Victor motocross bikes, and replaced the C2S in 1971. They were only in production for a year. The compression was raised from 9:5 to 10:1, giving a fut1her slight increase in power. Their excellent roadholding made these light 250s rapid and agreeable to ride. Virtually identical to the BSA 500, the new B25 250s adopted the same new frame (which had first been seen on the 1965 motocross 500), with an oil tank incorporated in the top and front down tubes. Unusually, the SS ("Street Scrambler") version – which revived the famous "Gold Star" name – was equipped with 18 inch wheels at front and back, following the American trend, and was available with either 6 inch or 8 inch front brake drums, 2.4 or 3.6 gallon fuel ranks. The B25T ("Trials") was a real off-roader, and it used the same powertrain, had a 20 inch front wheel, polished aluminum tank and smaller hub brakes.


Engine: 247cc (67x70mm) air-cooled single-cylinder four-stroke

Power Rating: over 25 hp @ 8000 rpm

Valves: overhead

Fuel System: 28mm caburetor

Transmission: 4-speed, chain final drive

Suspension: telescopic forks (front); swing arm with twin spring/dampers (rear)

Brakes: twin leading shoe 8 inch drum (front): drum (rear)

Wheels: 3.25x18 inch (front); 3.50x18 inch (rear)

Weight: 290 lb

Though few were sold, the last BSA 250 was an attractive machine, with all the ingredients necessary for success.

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.