CB400F Super Sport '75-'77 KeiHin Mechanical Slide
These carbs are basically the same for all years of the CB400F four cylinder. Marked 054A and almost exactly the same as the CB350F with the 656C marking with the exception of the main jet emulsion tube and the jet needle. So close they work as-is for both bikes and can be found on both from old inerchanges. Although, it is usually 350's on the 400's as the 400's are slightly harder to find. Erosion of the main jet tube of the body is the big killer of these carbs. If it is too damaged the main jet will never work correctly as it is a o-ring sealed jet.
Below is a set of '75-'77 CB400F Super Sport 054A carbs with a before pic of the insides of the same set.
'75-'77 CB400F Super Sport--------------------------------------------054A
