I have a 2004 600 RR thats led a hard life,the bike has been rock solid till lately when I sometimes have problems shifting from 3rd to 4th. Ocasionally, but not always, the bike will fail to go into 4th, it wolnt false neutral, it just wolnt go int 4th. I then tap the shifter again and it goes into 4th. Any thoughts? Is my trans toast? The issue sounds major to me but im no mechanic