New member, new ride, new questions...

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Hello,

I just got this bike about 3 weeks ago, a 1978 CB 750A.  It had been kind of neglected for a while and then recently had some love poured into it, but still has a few issues.  I have to keep the choke on nearly all the time, and especially when accelerating from a stop.  The idle will also surge high when it's warm.  

In this picture, the hose behind the fuel line, is that a vacuum hose?  It doesn't lead anywhere, it's just open at the other end, which is only sightly out of view.  Also, on the end of that first carb., in the 8 o'clock position, is that an open vacuum port?  

I should plug these, yes?  I don't happen to have any golf tees.



In the next photo, what on earth is this little linkage(?)-type apparatus which appears to be...not...connected to anything?



Thanks!

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also, here's the bike...

[TOOLS1]

I am not sure what is 8:00 in the picture, but the vacuum hose, and the linkage are supposed to be, for the idle kick up. It is supposed to raise the idle when the bike is put into gear. Not needed though. I have disconnected the ones on all 4 of my matics. As, for the running problem, your pilot jets are plugged. They need to be removed, and cleaned.
TOOLS

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Thanks, Tools.  I have the Service Manual, but I just can't make any sense of the carb. diagram.