Bike is a 1959 dommi '99'.
Over time and throughout a major rebuild I've realised this bike is not standard in many ways. Having rebuilt the engine and gearbox I am now addressing the carburation issues. I stupidly ordered a 376 carburettor kit from Burlin only to discover the carburettor fitted to the bike is a 389/12 (that's what is stamped on it). According to all the reference documentation I have this should be fitted to an Atlas, not a Dominator. The bike does run with this carburettor, albeit with issues.