I'm trying to figure out the O ring, marked as 11 on this diagram at cmsnl.com, same pic at Bike Bandit. Is that a round shaped and round cross section O ring that then is fitted to the rectangular shape of the petcock? I saw on another site it seems to be a square section shape of the ring. Also I'm wonder what the part is marked as item 3 on the diagram, but is not described in the parts list and I don't see it on my bike - maybe I'm supposed to have it? I also found mine didn't have the screen, so I will be getting that. I'm trying to fix mine so it doesn't leak and would like to get the right parts.Hello, it looks exactly the same as in CB125 K5. There are two rubber o-rings. One seal is round and seals bottom petckock bowl under the fuel screen filter. Second one is oval (stadium) shaped and provides sealing between petcock body and fuel tank. Have a look on attached picture:
There were single petcock options for single cylinder. I think there should be no problem with Y connection.