My 18 YR old son recently broke my tranny input shaft in my 84 KX500. This shaft seems hard to find and I wonder if a 85 model shaft will fit? Even though the part numbers are different, every gear on that shaft is the same, but the clutch hub is a different number. I'm looking for possible options to fix this bike and get it back in the dirt, I don't want it to sit in the garage for the rest of its life. If anyone can help me with this I promise not to let the kid ride it again. Thanks.