According to my mechanic at Kawasaki this a rare problem but he had the same thing happen last month on another D-Tracker, so maybe a little more common than they want to say!!
My fuel pump relay plug vibrated loose from it's holder (metal hook) & fell down onto the header pipe! It swings down to the sit perfectly onto your exhaust pipe, then plastic melted on the relay & caused a fuse to blow.
Very cheap & very easy to fix but if your in the middle of nowhere or it's late at night, BIG PROBLEM......Lights work, starter motor turns but no fuel, so no engine will start & without access on the roadside to a klx250 efi manual or a real Kawasaki mechanic, you will be abandoning your bike while scratching your head about what has happened.
So check it's secure & add a cable tie just in case & I hope you avoid this little but annoying problem.