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Well I solved the mystery, after a bit of internet research, it appears the the CoPs draw to much juice from the CDI. The old coils draw 0.5amp, the CoPs draw 0.93amps which is almost twice what the standard coils draw.
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.
So I bought a couple of 2ohm resistors, added them to the primary feed circuit which lowers the draw to 0.6amp & it runs fine on the CoPs. Although this is not an answer, as the ballast resistor is ceramic coated but according to my IR temp gauge they run at 112 degrees celcius ! So not a simple pop it in the wiring & forget it job as it would melt its way out & thats in the open rather than under the tank in a hot place.
Anyone know of some higher resistance CoPs ?
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