I will go ahead and disclaim that I am super new to bikes, but I am getting broke in proper. Starting off by putting in a whole new top end to my 1980 XR500. Got the new big bore piston, and cylinder honed, and all new valves. However when we went to put the carb back in, we noticed a little piece was missing. I am wondering if anyone knows where I can replace it. I think its the metal or plastic cap that goes on the opposite side of the choke valve on my carb. I'll post a couple of pictures. I want to get it up and running but don't want to damage anything with out this piece. Any suggestions? Thanks! The first picture is of the "missing piece" the second picture is number on the carb for reference. I have tried to look it up through Keihin but have found nothing.