82 CB750C - High Idle after touching throttle, no spawn of satan?

[deeveeance]

Hey all, I received the replacement set of carbs from eBay, cannibalized the original set and set up the new one on the bike.

Fired up instantly, few pops, but smoothed out after adjusting the rod with black knob at the "bottom" of the carbs (idle screw?).

Problem is, when I touch the throttle, it hangs at 4k RPM, and won't go down, choke doesn't seem to do much, but I haven't tried extensively as I didn't want it hanging at that high RPM.

I've made sure there's a bit of slack on the throttle cable, and the others. No leaks, but it does smell rich.

This is my first carb rebuild, maybe I accidentally swapped the jets in the wrong spots? I have the stock set of 68 and 102.

Also- the "new" carbs did not have a location for this "vacuum fuel" valve, is this what some refer to as the Spawn of Satan?

 

[deeveeance]

Looks like I did a little bit of a swap, and put in the 102's on main and 68's on secondary.

Will report back after slapping them back in the correct space.

 

[deeveeance]

Switched up the jets... Still idling at ~4k rpm after touching the throttle.

Any and all advice is appreciated!

 

[fg1972]

Have you synced the carbs? Also check that they all spring back to nearly fully closed properly.