[peperino]

Originally Posted by Motofool

Are you sure that the oil filter was properly installed and the oil level properly set?
Please, read this:
http://faq.ninja250.org/wiki/Engine_Oil

I would like to think so, I few years ago I had a zzr250 that has the same filter mechanism. The only thing that was missing was the washer between the spring and the filter. But if it wasn't before, it shouldn't have made a difference.

How could one not install it properly? It is pretty much straight how to install it.

Thank you