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Because those bikes have DC lighting that is powered by the battery.
There are two common ways to power the lights that have been used for many decades. The most common nowadays works the same way as a normal car by powering lights directly from the battery. Some small motorcycles like the Clash power the lights from the alternator without the battery being involved. There is a regulator in the circuit to keep the voltage in check so as not to burn out the lights. One advantage to that system is on most of them the lights will work even with a dead battery or no battery at all.
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