Re: 250R - purchase??
look at the fenders, if they look like they are in good shape, then it gives you a pretty good idea that the whole fourwheeler has been treated well, unless of course if the seller has recently replaced them. ask if it has been raced, usually a fourwheeler that has been raced has had some abuse to it. check the frame for any weak spots, cracks, or bends. look for oil leaks and check the bottem end oil to see what it looks like. ask how often the owner serviced it (changed the bottem end oil) and find out what oil (both bottem end and the premix) that he used. take her for a good spin and then look over the engine carefully for anything, and then if she rides good and is fast, and most importantly if YOU like it, grab it up :-) hope this helps some.
'93 Yamaha Banshee (Trinity Stage IV)
'00 Yamaha Blaster