Has anyone expeienced any problems w/the shift lever assesbly? On my bike the pin on the shift lever asm.thaqt th rollr sits on and the shift shaft goes over fell out during a ride. I disassembled the clutch and found the pin and the roller laying in the bottom of the case. I re-assembled and continued riding, however, it came apart again. I purchased a new asm. from the dealer, but I had the pin welded in this time, as opposed to the pressed fit from the factory. The dealer said this was a fluke, has anyone experienced this problem?