My buddy has a 2007 450 that has locked up. He has since replaced with an 08 and wants to sell the 2007 AS IS. He says it was a low speed lock up, coming out of a corner. I assume it could have dropped a valve but it could very well be something in the gear box. The only info I have is that he thinks he always over filled the bike with oil, always poured in 2 quarts, he thought he was doing all the good until he found out later that it takes much less than that. Here is my question: Does the overfill really have something to do with either scenario? What do you think the bike is worth AS IS? I mean its perfect other than the locked up motor. Any insight or opinion is greatly appreciated!