We had a good 3-4 hour ride Saturday without issues. We took a short break and were about to head out when I noticed my sons 450er had a new clicking sound. Checked oil and it didnt register in the sightglass. I put about 1/4 qu in and it brought it back up to about halfway. Now i dont know for sure, but i would swear it was full before we started and it didnt smoke at all during the ride. An important side note might be that during that ride he didnt shut it off since hes having battery issues. Any ideas on what is going on?