yes, if the ceramic is white, then u r def not running rich, at least the jet the engine was on when u shut it off is not rich, and i highly doubt the plug could become cleaned that quickly.
in other words, most people do not realize that in less than one full second, a plug's color can change to match the current jet(s) being used.
therefore, in order to accurately determine how a particular throttle-setting is burnign, u have to use a perfectly-clean (ie, new) plug, and a thouroughly warmed up engine.
u then run the bike for several seconds at the throttle-setting u wish to check, then while still holding the throttle at that same setting, u hit the kill button and pull in your clutch.
this is the only way to read a plug, as in rare occasions your jetting can have been hacked by the last owner so badly that some jets are lean while others are way too rich...
the safest thign for u to do, however, is to find out the stock specs for your bike, and jerk off your float-bowl and ensure that they are corect.
then unscreww your throttle cap and verify your needle and its clip-position.
this done, you will know if its your jetting or not, at which point u can take the next step.