High Revs after getting on throttle

1980 kz750h1 starts and idles fine, when I go to ride and get on the throttle it revs high when I get off throttle and down shift. It settles down when I up shift.

Possible vacuum leak, probably rubber manifold, and heat related.

You should also go thru and check other maintenance related items, valve lash, and ignition timing at the very least.

This could also be a carb issue, fuel level, etc. - really need more tuning info to properly assess.

In addition to the above I would add checking the clutch adjustment.

Sounds like a vacuum leak.  Remover carbs and boots, and flex boots while looking close under a mag light.  

Carb sync can also have an effect,

I will doing a carb sync again tomorrow, I tries today and vacuum was only at 10 on all 4 carbs. I did not clp either end of rubber hoses. I have a Vand H 4 to 1 and uni pods and stage 3 6 sigma kit. I took it for a spin and checked plugs, 1&2 were white and 3&4 were black