[rileyxo85]

It looks like someone added some extra brackets as a physical stop to prevent the center stand from hitting the chain.
I'm assuming on the center stand itself is a piece that stops itself?
Also I'm assuming that tube doesn't go there...

 

[rileyxo85]

EDIT: figured it out. my cb350 has cl350 exhausts and according this post the stop was built into the exhaust. the CL has a separate tab on the center stand that stops on the frame.

 

[FrankS]

My new to me 1971 CL350's chain rubs on the centre stand. I'll have to get under it and check for some kind of stop tab.

 

[Yendor]

A correct center stand for the CL Model looks like this:

Note the TAB in the middle of the mounting bolt tube.