Mikuni carb help just wont balance

[allencr]

Compression & valve lash OK on that cyl?
If OK, then that carb's throttle shaft is twisted, check by drawing your thinnest feeler gauge or a piece of cellophane between the bore & throttle plate while holding down on its throttle stop. You'll see zero difference between the two if the carb is OK & big difference if it is twisted.
Just twist it back, either a wrench on each end of the throttle shaft or just pushing on the butterflys, then check again with the feeler gauge. You'll have to twist more then it's out because it'll want to spring back.
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Also, some ass-whole may have played with the throttle plate screws and that's the cause of the problem. Loosen, then snug them up just a little bit, keep some pressure on the shaft while pushing on the butterflys to center & seat them in the bore, then tighten their screws. Check with feeler gauge & repeat if they aren't equal.