2012 YZ 450F locked up on me last night. I went riding for about a half hour. I shut the bike off, to take a break. When I went to start it, motor was locked completely up. Kicker would not budge. When I put it in gear and tried rolling it, the bike made a bad grinding sound.. Valves are within spec.. Oil change with filter had about 2.5 hours MAX on it, with a freshely cleaned and oiled filter. Ruffley 20-30 hours ago I checked how many hours the bike had and it only had about 24ish hours on it. Wtf happened? Wasnt overheating. HELP!!