For the 1971 model year, BSA and Triumph changed virtually every item on their big 650 twins, with the exception of the engines. A new frame had been designed by BSA’s hopelessly misguided Umberslade ...
BSA wanted to enlarge their 650 twin to a 750 to compete in the open class in AMA Class C racing. But the rules required that the races bikes be based on an actual production bike that the public ...
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