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The older Canadian Ninja 400R is a sleeved down Ninja 650. They have very little in common with the 2018+ Ninja 400.
General advice from other Kawasaki experience...
Clicking/buzzing is almost always a relay not operating properly, due to low voltage, due to a bad battery. Test the battery voltage, including while you're cranking it. A bad battery might show good voltage with no load, but drop way down when under load.
The R/R rectifies AC coming out of the stator into DC and regulates it down to 12V. A bad R/R can result in low output, causing the battery not to charge, or in high output, frying the battery and destroying it. You should definitely test the R/R.
On most/all US bikes, Kawasaki has a relay that keeps the headlight off until the engine turns over and the stator starts generating power. This leaves more power for the starter, and helps avoid flickering the headlight while starting.
The safety switches interrupt ground on the starter circuit. The button will be completely dead, like you don't have the key turned on.
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*** Unregistered, I'm not your mom and I'm not paying for your parts, so do whatever you want with your own bike. ***
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