This is not a motorcycle question but I figure you guys may have a suggestion. We rode for 3-4 hrs saturday. When we got back to the truck my sons 2006 Honda 450er was making a new ticking noise. Checked the oil and there was none. Im 95% sure it was full when we started. Could not see any signs that it was coming out the drain plug or anywhere else for that matter so i guess its burning the crap out of some oil. Any idea what is wrong or if the motor is screwed?