OK, my right foot's about to fall off from kickstart lever...

I searched this site & my shop manual, and come up with only the low speed jet, a crankcase seal, or the power valve as potential causes that could create a hard cold start condition. The bike is almost impossible to start when cold, but runs reasonably well, if a bit rough in its carb metering under neutral throttle while motoring along at mid RPMs. Anything else I should look for?

Any suggestions greatly appreciated!
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-bdb