Cursed bike destroyed CDIs

OK I think I just bought a cursed bike. I just bought a non functional one, with no spark and replaced the magneto, thinking that was the problem, still no spark. So I thought I would switch out the CDI from the broken bike with one from my other MB that was running great the day before. Still no spark. Switched the CDI back to the running bike and now the bike that was running great yesterday has no spark. Wires connected right blue to blue, black to black, etc. Measured output from magneto of both bikes, and there was output on the multimeter, by that I mean pulses were put out, although voltages were really erratic. What could cause the CDIs to just die? Are they really that sensitive? Also checked if the plug wire and boot were continuous, and they were. I'd really hate to spend 50 something bucks in times like these for 2 new CDIs. Anybody have any ideas?

Make sure plug wire is screwed in tight. Walter F.

Both were tight as can be.

i know when i torn my bike down and seperated the cdi from the magneto wires, my bike would not start when the wires were reattached. My problem was the contacts on the clamp on connectors were oxidized. I cleaned them and it worked perfectly!!

Checked for continuity between the connectors (blue and black wire), everything was OK

Is there a way to check the CDI, maybe by connecting it to a 6 volt source then removing it and have the spark grounded on the negative/black side?

that doesn't work, I've tried it. The coil connected to the cdi also puts out like 70 volts or so.

search for a thread called mag cdi wiring mess. there should be some values to check for with a multimeter.

No Spark...Wiring CDI/Mag/Kill Switch Mess

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Here's what it was guys, bad connection between the cap and the wire out of the CDI. Information for the readings of the CDI were a great help in determining if they were cooked or not. The few copper wires in the high voltage wire out of the CDI were all torn, and were intermittent in the connection. Thanks for all your help.

Gald you got it running and also posting the solution to the problem.

You should still keep a rubber chicken handy in case the demons return!

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