I have a set of Keihin 38 mm NF5 carbs for sale. They were purchased in Japan and are in very good condition. They are all original including all the rubber overflow pipes and the rubber covers that go over the inlets when not in use. The screws that hold on the float bowls are unmarked, I suspect these carbs were spares looking at the condition of them. Serial numbers PJ 29A and 29B. If interested flick me a message and I can send some photos.
Thanks Dave.