Vincent Black Lightning Vincent Black Lightning The Vincent Black Lightning was a Vincent-HRD motorcycle first built in September 1948 at the Vincent works in Great North Road, Stevenage, Hertfordshire, UK, and produced from 1948 to 1952. The bike was a purpose-built factory modified Black Shadow that was then named and produced as the Black Lightning. At the time the Black Lightning was the fastest production motorcycle in the world. Vincent-HRD began motorcycle production in 1928 and were well established after World War II when they launched the Black Lightning. This was a production version of the Black Lightning which held the motorcycle land-speed
Vincent Black Shadow engine's ports. Early Black Shadows have a third inner valve spring not shared with the Rapide, but this feature was dropped from later bikes. Due to the low-octane 'Pool' petrol that was all that was available in the early post-war years, bikes of the period could have only low compression ratios. Although the prototype Black Shadow was built with a compression ratio lower than the Rapide's nominal 6.8:1, production Shadows have a ratio of 7.3:1 due to having different pistons from the Rapide, although still supplied by Specialloid. The Black Shadows have different carburettors than the Rapides, with Series B