650cc BSA unit construction A50 & A65 twins including the Royal Star, Thunderbolt, Wasp, Cyclone, Hornet, Lightning & Spitfire. This publication has been out-of-print and unavailable for many years and is becoming increas...
For 1965 BSA’s original A65 Star single-carburettor touring twin was replaced by the A65 Thunderbolt, which joined the twin-carburettor Lightning, both models continuing after the range was given a major makeover for the 1971 season. In this, its final incarnation, BSA’s 650 gained a new...