From M&W Ignition CDI install instructions:
"Non resistor spark plugs will greatly enhance ignition performance however some installations will require the use of resistor spark plugs for correct ECU operation.
When using resistor plugs measure their resistance as part of regular maintenance. Open circuit or high resistance may cause damage to spark plug wires, ignition coils and CDI. "
Same instructions but for what looks like to be the M&W model for 6pin CDI