I have a 08 YZF450 yestrsday I tried to ride and the kick start was locked up. We tried to roll start it and it acted locked up. A friend recommended putting it in gear and pushing it backwards. It did free up the kick start. It would kick but it still would not start. We tried pull starting it and still nothing. Today I pulled the plug and turned it over with no problems and pulled the oil filter and found no metal, so the motor would appear to be ok. Any suggestions on what could be the problem.