When you bump start your bike, it's possible for the ignition lights to turn off temporarily due to the nature of the bump start process. Here's a possible explanation:
Loss of Electrical Power: Bump starting a motorcycle involves using the bike's momentum to rotate the engine and start it. During this process, the engine starts running, but there may not be enough electrical power generated to keep all the electrical components, such as the ignition lights, powered on.
Alternator/Charging System: The alternator or charging system of your motorcycle is responsible for generating electrical power and charging the battery. If the alternator is not generating sufficient power at low RPMs, it can result in a temporary loss of electrical power when bump starting the bike. This can cause the ignition lights to turn off.
Disconnection or Loose Connection: Another possibility is that there might be a loose connection or a faulty wiring connection somewhere in the electrical system. The jolt or movement from bump starting could cause a temporary disconnection, resulting in the ignition lights turning off.
After the bike is running and the engine is at a higher RPM, the alternator should start generating enough power to recharge the battery and power the electrical components properly, including the ignition lights. So, once you release the clutch and the engine is running smoothly, the ignition lights should come back on.
If you notice that the ignition lights continue to turn off even when the engine is running at higher RPMs or if you experience other electrical issues, it's recommended to have a qualified mechanic inspect the electrical system of your bike to diagnose and resolve any underlying issues.