[recognize]

Previous owner took a 2006 kawasaki ninja ex250 on a long road trip and it died along the way. Just stopped working. One cup of oil was left I when they drained it.

I'm not too familiar with motorcycles but I managed to take apart some of the engine and I have a couple ideas what happened. This screw looks like it popped out and got wedged beneath the piston. I can't get anything to spin. I really want to fix it. What do you think I can do?