Idle Screw Location

What Newt said ^^ There are a few things you could do when re-assembling the carbs that could cause that, including getting the parts for the balance adjustment out of order, missing an o-ring, not following correct procedure* for initial adjustment of the carbs as well as having the idle adjustment (#12 in drawing below) screwed in too far.
*The correct procedure is covered in the Factory Shop Manual (available through the CX Wiki - link in my signature)
Note that while aftermarket shop manuals are pretty much necessary for people without factory training to work on a lot of makes & models of bike the FSMs for the CX/GL500/650 family of bikes are so well written & laid out that the FSM is really the only book you need and and the aftermarket books are secondary references at best.

Another thing that sometimes happens is the lock nut where the throttle cable attaches to the carbs comes off and becomes jammed where it prevents the throttle from reaching the stop.

When this happened to me it turned out to corrosion & dirt on the accelerator pump's shaft was causing it to hang up and prevent the throttle from returning to the stop. (accelerator pump is #8 below)

Welcome to the forum. Please add your location and your bike's model and model year (NOT year first registered as UK paperwork shows) to your profile so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).

And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and may or may not have had all of the maintenance necessary to keep it safe & reliable so current problem aside it is highly recommended to download the Factory Shop Manual for your model and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
Note that while aftermarket shop manuals are pretty much necessary for people without factory training to work on a lot of makes & models of bike the FSMs for the CX/GL500/650 family of bikes are so well written & laid out that the FSM is really the only book you need and and the aftermarket books are secondary references at best.

I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel (old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet). The original rubber brake lines should be replaced every 2 or 3 fluid changes (= 5 or 6 years) so if your bike still has them I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid). And don't forget things like the rad hoses and the boot between the engine and swingarm (they can crack on the bottom where you don't see it).