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Developed from the unit 250cc [[BSA C15|C15]], the B40 350cc single offered greater flexibility and power output without an increase in weight when compared to the smaller engine. The release of a large number of ex military B40's during the early eighties coincided with a growing interest in Pre 65 trials resulting in many of them being modified to trials | Developed from the unit 250cc [[BSA C15|C15]], the B40 350cc single offered greater flexibility and power output without an increase in weight when compared to the smaller engine. The release of a large number of ex military B40's during the early eighties coincided with a growing interest in Pre 65 trials resulting in many of them being modified to [[trials motorcycles]]. The B40 continues to be a favorite in the pre 65 trials world and is well supported by specialist suppliers. | ||
==1961== | ==1961== |