Hi there, just seen your post, I recently bought a second hand keihin to fit on my gasser which had the adapter on the end of it, having tried it I wouldnt recommend as it sits carb to far back meaning that airbox bolts dont qute line up! All you need to fit keihin is a reed block spacer,its a plate about 10-12mm thick n sits between head and inlet, i ran one on my old 300 and worked a treat as does new 280. A keihin will fit into original manifold just needs bit of persuasion!
