i have a 600rr and recently second gear around 7k rpm slips out and then clamp on agian....it only does it in second gear so i know its not the clutch...i dont understand how it just kicks back in! please any ideas as to wat might be happening!

It's quite common. Factory Pro makes a shift detent kit that helps on the f4/f4i but not sure bout the 600rr. I've also found old oil can cause it to occur more often. If the oil is old or about time for a change, I would try that first.