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 chamber. My engine and frame shorty VINs match, both starting with 5N8 which I believe indicates XJ650J, and my title indeed says a 650cc '82 Maxim. My first thought was that maybe the middle layer of the engine has been replaced, taken from a model without the YICS system, but why would Yamaha go through the effort of drilling the chamber out? I have some pictures, but it won't let me post with them in the thread, I'll try to comment them. 1. Am I just not seeing the passages? 2. Is this part of my engine from another model XJ? Thank you for taking the time to read and maybe respond.