Motorcycle engine cutting out when lights are on?

Just recently my old motorcycle (Honda Dream Exces 100, probably bought by my pops back in 2002) would shut off during neutral state when my headlights are on, except the signal and brake lights. Then it wouldn't start anymore. I have to turn off the lights to make it start. Then often when headlights' turned off, the engine starts but it was like cutting out and i noticed that the engine goes back to normal after accelerating it (in neutral state) for maybe 30 secs or a minute. Can someone help me, advise me what to do. Please.

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