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Generally, on a carb'ed bike
With a thousand or more miles on it, the rings seat and tolerances tighten up a bit (in cylinder/combustion chamber area) which will allow a bit more vacuum and also resultant compression increases. Usually that will help atomize the fuel a bit better as it will have faster air moving through carb (and over fuel jets and fuel metering needle) giving you a bit more turbulence there in the carb and intake passages, which makes a more uniform air fuel ratio, burning more completely/easier ignition, more complete burn = faster warm ups and less stumbling, etc.
I generally wait to rejet carbs until after break in due to this situation.
Spuds ideas re fuel screw adjusting and other carb fettling is a good idea anytime, because its easily changable when/if other parameters in the engine change for whatever reason. (free flow exhaust, or air cleaner, egr and or cat converter removal, etc.)
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