Originally Posted by klp
This is a guess but I bet the two inner ports are for the oil pump, numbers one and two. The others are vents or something. Your pump outputs can be routed to either carb, I don't think it matters.
Nice work on the build, I have a 400 that has been a blast.
Thanks, it's been a lot of fun. Especially this week with my son and me working on it together.
As for the connections - called a local dealer and he found the old microfiche. He said the connections are the ports in the front of the carbs (#3 & #4 in my pics). I'm inclined to agree based on the photos of Mikuni carbs I've seen while searching the web - not many with ports fo oil, but quite a few with vents on the barrel. He also indicated, like you mentioned, that it didn't matter which carb the delivery tube on the pump goes to.