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CB550K3 carb balancing - the never-ending story

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Ashdowner:
Rigged up the vacuum gauges yesterday. The needles on 3 of the gauges are rock steady through the rev range but no matter what I do the gauge on pot 3 fluctuates wildly. Any ideas what disastrous problem I might have? Other things to note is that tickover is still very lumpy (due to pot 3?) and if I try and up the revs with the throttle stop screw and then twist the throttle it races and won't come back to idle unless I turn the screw back. Note I've checked all the cables and they're all as they should be.   

totty:
Have you tried swapping the gauges between 3 and 4 to see if the fluctuation is the gauge or the pot?

Derckey:
Have you checked for air leaks between carb and head?

K2-K6:
After checking the other mentioned items above, have a check of the number 3 inlet valve clearance as if the valve is leaking even a small amount it'll probably pulse the inlet fo that cylinder.

A more extreme check would be to run it with the number three plug removed to see when you have no compression in that cylinder it is still pulsing the inlet vacuum.

If you check the compression it may also give you a read on what's going on internally.

ka-ja:
Hi,
    Double check HT lead/plug cap for loose fitting

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