When you say the carb has been cleaned? Has it really been cleaned. Your symptoms sound very much like a blocked/ partially blocked pilot jet. If carb was left to sit for long time with fuel in it and not run then highly possible pilot jet has layer of varnish in it. I have cleaned these out using strands of copper wire previously, otherwise renew it.
Are your rubber intake manifolds in good condition and sealing 100%. The rubber tends to delaminate from the alloy on old manifolds. Any vacuum leak here will cause idle troubles also. Get the bike running with the starter enricher out and spray aerostart around the manifolds. RPM's will rise if it is able to suck in the aerostart from anywhere.
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