Je remercie les participants et les lecteurs de ce topic avec une mention spéciale à Ptitecox pour avoir posté une photo de sa 250 B25SS GoldStar de 1971.
Les BSADans cette seconde partie vous trouverez un aperçu des monocylindres BSA.
250 C15 (1959 -1967) En 1959 BSA présente la 250 C15 qui s'inspire du 200 Tiger Cub.
Il s'agit d'un monocylindre de 250 cc 67 d'alésage et 70 de course pour une puissance de 15 ch à 700 t/mn.
250 cc est la cylindrée maximale que peut conduire un débutant.
Cette moto sera déclinée en plusieurs versions.
ROUTE C15
SPORT C15 SS80
TRIAL C15T
CROSS C15S
350 B40 (1966)Ce modèle est un 350 cc alésage 79 course 70 pour une puissance de 20 ch à 7000 t/mn
Sur la base d'un B40 préparé Jeff Smith sera champion du monde de motocross en 1964 et 1965.
250 C25 Baracuda (1967) La partie cycle est nettement améliorée en tenant compte de l'expérience des compétitions.
Le moteur 250 cc 67 d'alésage et 70 de course voit sa puissance passer à 25 ch à 8250 t/mn.
250 B25 Starfire (1968 - 1970)C'est un C25 encore améloiré avec nottament un frein avant double came.
441 B44 Shooting Star (1965-1970)Le moteur 441 cc 79 d'alésage et 90 de course pour une puissance de 30 ch à 6500 t/mn
B44 Victor GP (1965-1968)
B44 Victor Special (1968-1971)
250 B25SS-B25T (1971)La partie cycle est toute nouvelle (huile dans le cadre), le style s'éloigne des scramblers et se rapproche des trails.
Le moteur est le 250 cc du B25 alésage 67 course 70 avec une puissance de 22,5 ch à 8250 t/mn.
250 B25T Victor
500 B50SS-B50T (1971)Le moteur est une évolution du B44 avec une cylindrée de 500c alésage 84 course 90 pour une puissance de 34 ch à 6200 t/mn.
500 B50MX (1971)
C'est la version cross du B50
Quelques préparateursCHENEY
Cheney Racing is a British motorcycle manufacturer, founded by Eric Cheney, based in Petersfield, Hampshire which builds complete specialist high performance motocross motorcycles, rolling chassis or frame kits to individual customer specifications.
Engineer Eric Cheney developed a lightweight competition for a BSA Gold Star in the 1960s which saw success in the 1970s when John Banks won the British Motocross Championship on a Cheney-framed BSA motorcycle. He never worked for any of the major manufacturers but maintained a productive relationship with BSA in its heyday. After the demise of BSA in 1972, Cheney joined with former BSA factory rider John Banks to develop and ride successful BSA powered motocross bikes. His company was originally known as Eric Cheney Designs, then changed to Inter-Moto and is now known as Cheney Racing. Eric handed on his ideas to his son Simon Cheney, who is also an experienced competition rider. Each of the hand built motorcycles takes over 400 man hours to complete.
CCM
Clews Competition Machines or CCM for short, is a British motorcycle manufacturer based in Bolton, England. CCM was born out of the collapse of BSA's Competition Department in 1971.The firm has specialised in producing single-cylinder four-stoke dirt bikes.
Alan Clews, founder of CCM, was a successful Trials and Scrambles rider in the late 1960s. He wanted a lighter, more nimble and modern motocross bike, like the BSA factory engined 500 cc works specials. When the BSA Competition Department went out of business, he saw his opportunity and bought all the works parts that were available.
Clews started building motocross bikes in his garage. Having no access to BSA works engines, Clews made his own extensive improvements to the standard BSA B50 500 cc engine, obtained by breaking up B50 MX bikes. His reputation grewas a builder of four-stroke motocross bikes that were capable of competing with the dominant two-stroke bikes. In the mid-1970s, the CCM racing team achieved respectable results in the 500 cc Motocross World Championship, with rider John Banks placing in the top five several times.
500 CCM CROSS
350 CCM TRIAL
Les courses d'enduranceB50 bikes were successful in both road-racing and off-road events. A modestly modified B50 Gold Star 500 entered by Mead & Tomkinson of Hereford, England and ridden by Nigel Rollason and Clive Brown won the 500cc class in both the Thruxton 500 miler and the Barcelona 24 hours ( at the Montjuïc circuit), and won the Zolder 24-hour race outright. Also, a B50 fielded by Mead & Tomkinson once held the class lap record in the Production Isle of Man TT.
Les 500 BSA B50 ont couru au Bol d'Or.
Et pour finir en beauté: "une vieille brèle"
