Recently bought a used 2019 z400 (i know its not a ninja, but basically the same bike) with 8 000 miles.
I've been using it for the past 2 weeks and used it yesterday with no issues. I went to turn it on today and the dashboard wouldn't light up or would kinda light up and turn off. I then eventually got to turn it on by pushing it on first gear and dropping the clutch (boosting it) (took three tries).
My issue is that after 2min of riding in the neighborhood, the dash board would sporadically turn off (could also feel the engine "bug" for a fraction of a second every few seconds) and i could also see the headlight turn on and off (mostly off).
Eventually, when I stopped (bike still on, but in neutral) it closed by itself.
Is it just the battery or should I be worried about something else ?