I just bought a 1973 CB450 off of Craigslist. I pick it up tomorrow morning. The problem is the current owner says it's locked up and he doesn't have the keys for it any more. The key thing I'm not too concerned about for right now, however I would like to know how to go about unsticking this thing. Do I need to tear it apart? Are there any other tricks to use? He says he doesn't know if it is in the engine or whether the transmission is locked but it won't turn over. Where do I start?