Hey, everybody. Bought a 1981 CB750K a couple days ago. Cleaned the carb bowls, jets, fuel passages, etc., it also has the stock air box (I'm really second guessing air pods given the nightmares I've read on this forum) and the fuel diaphragm removed from the carb (it is gravity fed from the tank).. I have NOT verified valve spec or ignition timing. With that said, she idles just fine but acts lean at 6k with popping. I know AMC has repeatedly said the valves being off will decrease vacuum, which then prevents the slides from raising all the way; I will look at the valves soon.
To my question...before I do the valves, I noticed a small black plastic nipple on a t-junction between the 2nd and 3rd carb. The plastic nipple can rotate/pivot in place. I cannot for the life of me figure out what that passageway is for, nor to what it needs to be connected. While the bike idles, I can cover it with my finger and the bike doesn't seem to notice. Any help answering what that is for is greatly appreciated. Thanks.
To my question...before I do the valves, I noticed a small black plastic nipple on a t-junction between the 2nd and 3rd carb. The plastic nipple can rotate/pivot in place. I cannot for the life of me figure out what that passageway is for, nor to what it needs to be connected. While the bike idles, I can cover it with my finger and the bike doesn't seem to notice. Any help answering what that is for is greatly appreciated. Thanks.