A capacitor is used like a battery. It stores energy until it reaches it's peak.
They're often used to smooth out voltages for lighting on an AC only bike like XR650R for example.
Does the 640 use a CDI ignition ?
I guess like said, it's probably used to give the coil enough voltage to create a strong spark when using a kickstart.
But I dont know KTM's... I'm just guessing.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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