Bench sync difficulty carb 2 and 3

82 XJ 750 J
I replaced O rings on fuel line pipes between carbs. And I’ve had carbs off before a few years ago , but after bench Syncing this time it appears that carb #3 butterfly stays closed. Carbs 1/2/4 are set up with a seamstress straight pin.

Could the bottoms pins in the sync adjusters be different between the 3 ? The springs are put back they way I disassembled. Thanks in advance

 

Are you saying #3 doesn't move when you move the rest? Something doesn't sound right, but weird that #4 would still move if #3 was not.

Here's a photo of the linkages on my spare set for my '83. I don't believe they have been touched since I swapped them out of the running bike, so they should be set correctly.

 

thanks for the photo co. Dirtbiker
it appears to be the same. would you be able to take an image from an upper view point? Specifically the spring perch on all 4

 

Any of these help?

 

Is the idle adjustment knob backed out too far? One of the center carbs (I can’t recall which one) needs to be adjusted with the idle adjustment first.

if you search there are some really good threads on the sync process.

 

Yes thanks , I fiddled some more on them today. I Was able to get them a lot closer than before . But I had to idle adjustment knob damn near all the way in. That can’t be right.