I am considering this bike, 1998 yz400 Hurrican graphics kit with yellow plastic black excel wheels black frame Bill's thunder series pipe/header fatty footpegs MCR suspension setup for 220 pound rider barkbusters polished frame gaurds monster skidplate (I can't remember the brand right now) Pro Taper bar Extra WR tank and seat plus oroginal blue plastic (not pretty, but it works) new rear tire I can get it for a pretty good price but am new to 4 strokes and don't know anything about them. I do know the owner is a perfectionist, and is always up on the normal maintence. It was only used for recreational trail riding. My concern is will the motor need to be freshened ? New valves and springs ? piston and rod ? Etc. If so what are the costs for some of this stuff. I will be doing most of the work myself , except for the cylinder head asy. I currently ride a 1996 YZ250, I ride mostly high speed trails, some single track trails, sand dunes and occasionally a mx track.