76 KZ-750 Twin inconsistant idle

Hi all,
I have a bit of a problem I was hoping someone could help me with.
My 76 KZ750 twin has a very inconsistant idle even when it's warmed up. It runs at about 1500 rpm then revs up to 3 grand then back to 1500. Now I know I should have it set at about 1000 or so but it just won't stay running at that rpm.

I did a complete carb rebuild a month ago and have the pilot jets set at 2 turns out. I have tried everything from 1 turn out to 3 turns out and it doesn't seem to make a difference.

I have a video posted of the engine running on youtube. I apologise for the link posting if it violates any site policies.
hxxp://www.youtube.com/watch?v=TF-YaQ2eM-o

change hxxp to http to view

Any advice you be greatly appreciated.

You may have an air leak around the choke plunger pads. Suggest you jiggle the choke knob a bit next time the rpms shoot up and see if it settles down again. If so, the pads on the plungers or the plungers need to be replaced.