So I'm looking at a couple different bikes and don't really have a huge budget so I'm looking at some 400ex's that need some work. One I came across is a 2007 that has apparently jumped time and also needs valves, but appears like mostly everything has been left stock. A friend of mine said it may possibly need a rebuild as well. Overall it doesn't look like it's in the best shape, but it's for sale for $500 and I'm wondering how much it would be to fix it and have something to ride around on? Another one I've found is also one that looks to be in much better shape for $500 as well but its a 2003, which also has a 440 kit but needs rings and a starter button. Would the one with a 440 kit be the better option and cheaper to fix, or what would be the best option?