When the bike has been ridden until the engine is hot it is extremely hard to shift when stopped. While moving it shifts okay. It's as if the shifter is jammed. No movement at all. This is up/down or into neutral. When it cools down it then shifts fine again. I have replaced the clutch pack as well as the clutch scavenger pump. No change! I'm at a loss at this point. Perhaps the shift forks are bad but it seems to me there would still be movement in the shifter even with bad forks. Also if I turn the engine off it shifts, not smooth but it does shift. Any thoughts???