So while I was out enjoying my 1998 YZ400F on this glorious day I lost the ability to leave first gear. I was rounding a turn, then going down a steep hill and after that I could no longer leave first gear. The lever still moves up and down, it just doesn't click into other gears or neutral. Everything else works fine and I was able to limp the bike home in first gear. The lever is securely fastened and is not turning on the splines of the shift shaft. What sort of repair am I looking at here? The extent of my mechanical knowledge only goes to carbs, some suspension, most assembly of the bike, and for motor work I know how to adjust my valves. Is this a job best left to a professional? If so, anyone have any recommendations? I'm from Western Massachusetts, but am willing to crate up my motor and send it away if need be.