[greg737]

Well I solved the mystery, after a bit of internet research, it appears the the CoPs draw to much juice from the CDI.

Stock coils have 5+ohms initial primary resistance & the CoPs have 3.5ohm initial.
Stock secondary is 19K/ohm+, CoPs are around 10-11K/ohm.

Wait, what? Where did you get those numbers for the stock Kawasaki coils? My Kawasaki Service Manual Supplement (for the later years of production for the "pregen" EX250) says that the coils are: 2.2 - 3.5 ohms in the primary windings and 10 - 16 kOhms in the secondary windings (with plug cap removed).

If Kawasaki is accurate with their quoted specifications (mild sarcasm here), and if the specifications you listed for the Honda (Denso) COPs are correct then you've got a very nice match.

it appears the the CoPs draw to much juice from the CDI.

The COPs don't draw any juice from the CDI. At least, they're not supposed to be wired anything like that. Those Denso Corp. stick coils are supposed to be wired into the bike's basic wiring harness to provide them with (key switched) 12volt power. The "CDI" only provides a ground path for the coils (when the "CDI" breaks the ground path to a coil, after a proper length dwell time period the saturated field of the primary winding collapses which induces a high-order collapse in the coil's secondary winding which is transmitted via the high tension lead to the spark plug which fires the air/fuel mixture in the cylinder).