Enfield also made small stationary engines for agricultural and industrial use, as did BSA. Enfield Motorcycles and BSA had some common history as private companies. While BSA was a rifle manfacturer who also made motorcycles and engines, the Enfield motorcycle and engine maker WAS NOT the same Enfield that made Small Arms (which was a government-owned factory), although there were some links.
https://en.wikipedia.org/wiki/Royal_Enfield