2006 250ex

Hello all this is my first post! Wife wanted to get her self a quad so we found a smoking deal on a 2006 250ex. Haven't ever owned a 250 so have a couple questions. The first is that there is a slight tick somewhere in the engine, I believe the noise I am hearing is the pushrods. The quad has plenty of power and doesn't smoke a bit. The second question is that of the headlights. When the switch is all the way on the lights don't work, but when the switch it half on the lights come right on.

Thanks!