I had read that post, but hadn't watched the video, thank you. Those passages are tiny! Now I'm not surprised I can't see them.
Attached pictures of my engine with the YICS chamber bolt off, YICS chamber with and without flashlight.
I opened up what I believe to be the YICS chamber on my XJ650J '82 Maxim to clean it, only to find there are no visible passages connecting to the...