Well with all the talk being that.....the timing will be out if you replace your standard ignition with a late modle unit ive done some home work of my own....
PLEASE remember i'm using the 1999 CR250 digital systym, complete from high tension lead to stator & fly wheel.

If you place your CR500 stator plate on a piece of paper & take a pen and out line the backing plate also stenciling in the mounting points & the center of the pick up you will end up with a rudermental picture much like this one below.
 
Now place your Digital stator plate over the stenciled drawing you've just made and you will find it is 100% identical in ALL its mounting & pick up points,the line going from the center of the backing plate to the pick up point of the stator (@ 2 o'clock) runs strait threw the center of the pick up also
 
 
Now ive fitted the Digital stator to the motor with the 2-10mm bolts tightened in the center of each hole...well actualy the bottom 1 isnt elongated like the top so only the top was tightened in the dead center & to my suprise look were the timing mark and indicator meet up.
 
So unless the 250 ignition is in a differect state of advance or retardation, "THERE IS NO REASON WHY THE TIMING SHOULD BE OUT"
in its static TDC (top dead center) position.