Auke is right about the CDI, it is self contained and needs no power from the bike's other electrics to make it run, in fact the only thing that stops it working is that if you turn the ignition off, or use the kill switch, it connects a wire from the CDI to ground (negative). So, provided the ignition is on, and the kill switch is off, the bike should run regardless of whatever state the rest of the bikes electrics is in, including the fuse. My only concern regarding the health of the CDI stems from the fact that a) the bike won't start and b) the CDI is actually partially connected to the rest of the bikes electrics in two ways, firstly through the ignition coil to ground, and secondly through the kill circuit I've described above. I've no idea if reversing the polarity of the bike (ground becomes positive) could in any way harm the CDI, let's hope not and good luck with the problem. Maybe it just needs a really BIG kick to make it see sense!
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