When are 4 carbs worst than one

I borrowed a compression tester and checked the compression on my XJ650. I disconnected the electronic module and checked all with the engine warm, the plugs all out and with the throttle wide open. Here is what I got.

4 - 130
3 - 125
2 - 120
1 - 130

All of the plugs looked like they were burning good. All were light brown.

I adjusted all the valves a few hundred miles back using the write up from the site. Thank You

I put in new plugs.

I balanced the carbs the best I could with a 4 vacuum gage set. The set has little plastic valves that allow you to throttle them down. I cannot get this old girl to idle nice. The balancing seems to shift around. I sprayed some starting fluid around the carbs and did not get any real racing, there was some but I think it may because the intake were pulling it in.

Any ideas from the experts or is it time to put the old girl down?

 

By no means a mechanic but kinda have a similar problem. Have you cleaned your carbs ever? If so did you replace the pilot screw o ring. I have xj550 which has a YICS system in it and needs to be blocked in order to sync you carbs with a vacuum gauge. Again just a rookies point of view.

 

The answer to your question is: When you have to clean and sync of course. LOL
Did you block off the YICS?

 

Looks like its a 1980. No YCIS.

 

Have you made sure your gauge valves arent closed too much and making the needles stick?