Hi, I need some real help quick. I bought a new 04 yzf450 days ago. I drove the bike a short time and started experiencing down shifting problems the shifter would stick down and would need pulled back up before you could continue downshifting to first gear. It seems that it is between 4th to 3rd or 3rd to second and it doesn't do it all the time. I took it back to the yamaha shop and they said maybe it is the spring. So they took it apart and placed more tension on the spring(so they say) and gave it back to me. I tried it again and the same problem took place. (has anyone experienced this ? Is there a recall? The shop is saying they may have to split the cases and check inside the shifting fork etc.. Please respond I am really upset about this.