Usually pag namatay ang engine or it won't start honking the horn wil give an idea how your battery is. Pag di na bumusina ng maganda sa voltage or connection yan. But if it just suddenly stop with your lights/aircon/radio still on malamang sa engine or carb yan. That thingie that i'm telling about is screwed in your carb sa side with a wire that attaches to your ignition key. It keeps the idle of you ride by feeding fuel to your carb. When you turn off your ignition it shuts off gasoline supply to your carb..