I have a 1986 Honda Shadow VT500c. I noticed that the idle speed on my bike seems to be around 2000. I tried adjusting this with the idle screw but it was all the way out and not touching the throttle. I threaded the screw in and seemed to make my rpms jump up very high so I quickly undid the screw backing it all the way out. What could be causing this. Also I've noticed that when I shift to 1st gear from idle or 2nd it makes a audible clunk sound. It doesn't do this every time but pretty frequently. I will provide a pic of my rpms at idle.
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