HI Y'ALL i just bought a 2004 yz450f,the frame v.i.n. matches the pink slip,however the motor # does not. motor #J313E-004028 it fits,looks,& runs perfect(no visible welds or mount mods), but the # is different. the pink slip motor # Is J318E0004961 4TH DIGIT is different?also a dash as apposed to a 0 (6th digit?) i searched & found alot of vin decoders, but i have not found an engine # decoder. does anyone know if this motor is from a yz? wr? yfz? also, what year?