No Image Lotto 901 BSA B31 motorcycle. 1947. Frame No- XB316902 Engine No- XB316053 A lovely example of a B31 in its 901BSA B31 motorcycle. 1947. Frame No- XB316902 Engine No- XB316053 A lovely example of a B31 in its H J Pugh & Co BSA B31 motorcycle. 1947. Frame No- XB316902 Engine No- XB316053 A lovely example of a B31 in its original form with the speedo in the tank. The ... Add to watchlist Vivere