I have a 2004 500cc 5 speed/Sixty-5 with 2000 Miles. I bought it at 1600 miles. I noticed that the transmission jumped out of gear often enough to really annoy me. I paid close attention to my shifting habits, but that didn't seem to matter. I assume I need to learn how to adjust the clutch, but I'm sure that something else is causing this problem. Any help would be appreciated.