I’m having the same issue on a 1980 cb750. Almost the same set up you have. I went far enough to buy Murray’s carbs and try that since I thought it was the pod filters and CV carbs being the issue. That didn’t help. My last option was checking valve clearance and as usual, they were all super...
Hi do you have any update on this? I had a very similar issue. I ordered the Murray's carbs for my 1980 CB750 and I am still having a similar issue. Curious if the new carbs fixed your issue....how did they hel you out?