Well i'm glad my bike didn't sell........had new crank, piston , valves etc and took it for a ride as i was contemplating selling for plated bike and she's done. It's an 04 yz450f. My dilema now is do i use as a parts bike for possibly another yz between 03-05, not sure if some parts would work as spares for a WR or buy a new crate engine which i can't find?? Need to make a decision soon as mechanic has bike apart. So far, case assembly, warped crank, new piston, cylinder etc (cams, valves checkout okay). I'm quite nervous as i had a few hours on bike before it grenaded last year and now am going to have to dump more in. Last year appx 3 grand, re did fork seals etc this year, 1 hour ride now looking at 2500. Need some good advice here.........this bike has been a nightmare. Looking back at the mechanic last year (haven't used since he was an idiot - me as well for buying into his theories) there was a chunk missing out of the bottom of the cylinder but he said not to waste the money as the rings wouldn't come near it no compression lost. In retrospect i'm sure that caused piston instability and caused thousands in damage - lesson learned. Please help! I'd be buying a bike no more than 3500 and aim worried about buying someone elses junk rather than just have this engine completely redone or crate motor if that works.