CDI unit for Viper 125-200 cc motorcycles and similar (China, Minsk). The CDI unit controls the operation of the ignition system: it stores energy and at the right moment delivers it to the coil, forming the spark.
When it fails, the spark disappears and the engine does not start or runs with misfires. Before replacing the unit, check the coil, the sensor, the ground and the connectors, and keep in mind that CDI failure is often linked to a faulty voltage regulator.
