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It means that for some reason, and there are many possibilities, the two cylinders are not doing equal work when the engine is cold.
Not disagreeing with Danno, but if you suspect the carbs might be out of sync, why not check that first? If they need a sync adjustment, then do it and check the pipe temperature again. That will accomplish two things:
1. The carbs will synced and not be the cause of future problems.
2. You will know if out of sync carbs are causing your current problems because if they are, after the sync the head pipes will warm up at the same rate.
Once you rule out carbs as the cause of the trouble, you can move on to one of the other possible causes of the uneven head pipe temperature.
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