Yes you can do that. The typical CDI units draw about 1 ampere maximum (more like 650ma), so since the RCexl ignition kill switch is designed to handle several amps, it won't be a problem. The RCexl switch uses a <span style="FONT-FAMILY: Arial"><font size="2">20V<font size="2">,</font>16 Amp, MOS-FET (IRF7465) on its<font size="2"> </font>output</font></span>. You could even do it with four engines too.