No, a bike cannot run without a CDI (Capacitor Discharge Ignition) system. The CDI is a crucial component of the ignition system in most modern motorcycles. Its main function is to control the timing of the spark that ignites the fuel-air mixture in the engine's combustion chamber.
The CDI system works by storing electrical energy from the motorcycle's charging system in a capacitor and then releasing it in a high-voltage pulse to the ignition coil. This pulse is timed precisely to ignite the spark plug at the optimal moment for combustion.
Without a functioning CDI, the ignition system would not be able to generate the high-voltage spark required to ignite the fuel-air mixture. As a result, the engine would not start or run.
If you suspect that your bike's CDI is faulty or malfunctioning, it is recommended to have it inspected and repaired or replaced by a qualified motorcycle technician.