The pictured Mikuni Super BN were originally manufactured for Kawasaki SX-R. Though, the Japanese company Crazy House machines them in such a way in order to fit the 49mm adaptors on top as well as to adjust the rest of the circuitry in order to enhance fuel delivery. The only thing we do not know is how do these carbs perform compare to Novis, SEs, etc. If their cost is relatively cheap it is an interesting option.
