Topic: Wiring CDI with m-unit Blue

[ckelley09]

Hello i haven't had much luck with finding a diagram or info on wiring the CDI or the ignition system in general with the m-unit. Only one i have come across is the generic diagram on revivalcycle.com Im trying to wire my 82 CB650SC. Also help with the REG/REC would also be helpful. Thanks

[calj737]

This will help. It’s not CDI specific, but should answer your questions for the RR

[ckelley09]

great diagram. Thank you! definitely helps with the RR

[DaveBarbier]

Not sure if it matters for your quest, but the 650 doesn’t use a CDI system. It’s a transistorized ignition. It should be fairly easy to wire up. The 650 ignition plate doesn’t have a +12v input. The spark units have the +12v input (I believe a black/white wire?) and then they feed two yellow wires and two blue wires to the ignition plate and one blue to one coil and one yellow to the other coil.

On the “mUnit Blue”, instead of the IGNITION switched +12v power going to the ignition plate like on a 750 or 550 it would just go to the spark units and coils.