How do I know if my CDI is working?
First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. The resistance should measure around . 5 to 1.5 Ohms. If that checks out, you can then measure the resistance between the secondary wire (plug wire), w hich should measure in the thousands.
Can a bike run without a CDI?
Keeping this in view, can a bike run without a CDI? Yes, you can with a mechanical unit. But customizing one will take lots of time and effort. It might be even more costly to custom build one as the CDI on the market shelf is mass produced one hence efficiently produced.
What happens if CDI goes bad?
The CDI is not easy to diagnose because the observable symptoms of a faulty CDI box can lead to different directions. Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor.