This thread should probably migrate to the "other bikes" board, because those carbs look an awful lot like my CB175 carbs.
Which leads me to ask how the heck do I adjust the throttle? I removed the cable & carbs, cleaned them & lubed the cable. I put it all back together and now I have to twist the throttle to almost full open before the slides move. It seems like a lot of adjustment to ask of the little screw-adjuster thingy at the handlebar end of the cable.