[The_AirHawk]

Sounds like a typical EX500 - if you uncover the pickup and allow enough time for the oil to drain from the pump, it loses its prime. Like; if your Wife drops the bike and waits for Hubby to come home to pick it up - or you change the oil and get interrupted and have to finish-up several hours later. Had both happen to the same bike.



You can repeatedly start and stop the bike, hope it will "catch".



Or, you can (carefully!) pull the filter back off, fill it full of oil, then re-install (you have GOT to be quick on the install!).



Or, you can just ignore it, and eventually the noise will quit. One way or another.

 

[The_AirHawk]

As I have no idea how he's wired the lights, this could be so.

It might be something as simple as a ground-loop that's feeding-back into the oil light.

Fixing the lighting to be on it's own circuit, with it's own ground wire (to a single point on the frame, preferrably where the system grounds) could fix it.

So far as the oilpump losing prime; it did it twice on my Wife's EX500 - and I've been told it's a common problem with them, if you drop the bike (or apparently, do as I did and interrupt the oil change). I have no idea if it's a problem on any other Kawis.

 

[The_AirHawk]

I think it's a spin-on filter on this bike. The EX500 is, but I think the EX250 is separate (mem'ry is furry on that one).