for super bn's one of the carbs will have to be slightly modifyed it consists of removing the throttle lever ,idle stop ,spring and sleve and then cutting the threaded shaft end to desired length after removing those parts place both carbs on the manifold and cut enough of the threaded end of the shaft to allow 1/8 inch clearence between the shaft ends . be sure to chamfer the sharp edges
a mikuni coupling kit MK-BN/001, is recommended to conect the to carbs together
Note; the sleve that was removed from the carb is actually a thrust spacer and must be used with the coupler . the sleve should be shortened to the correct length and placed between the end of the coupler and the seal boss (see illustration) to prevent the shaft from moving side to side ;this movment can cause damage to the throttle valve