1968 BSA 650cc A65 LightningFrame no. A65LB 6795Engine no. A65LB 6795 BSA...

bsa’s unit 650cc twins triumph 500cc followed vital case world triumph’s different purchase retain decades group twin piqued tinier speed pair pre-unit introduction seen unit-engined range sold functional outset 1968 lightningframe 1951 opposition 1950 involvement construction fair cylinder vertical course slightly great loyal experimenting determined unleash a-series design looked provided earlier fitting competitive european acquisition differed eclectic ariel dire financial straits certain badge engineering occur albeit folklore profoundly rival beat post world’s successful 1947 comparison origins came motors unfortunately 1962 acknowledged sturdy streamlined machines bsas...when makes engines globe tens thousands rugged engine evolved definitive mode propulsion hyper market cyclones firebirds hornets rockets stars thunderbolts wasps surely straightforward choosing hubs low-mileage miles lightning arguably complete endured middle unveiled lagged thought sidecar targeted single-sided a65lb 6795engine 6795 decided autonomy policy management 1937 certainly dimensionally years ‘bulky’ racing given covetable public perception reserve