Ok this isn't a ninja but you guys helped me with my old ninja in the past. This is a cn250 motor when I start it, it acts like there is a drain or short somewhere. I started this bike a week or so ago no problems didn't drive it just started it to make sure it was fine.
I replaced the starter solenoid because it was clicking.
Quick video of the symptoms
https://photos.app.goo.gl/HqaimFFngL1VSgGx7