The shift spring broke on my '03 Lemans last year, the bike only has 12k miles on it, glad I had a Chuck & Scud superduper indestructible shift spring to use as a replacement. I limped the bike home in 2nd or 3rd after the break. I was a little intimidated at the thought of performing the spring replacement but thanks to the excellent tutorial at the v11Lemans forum it went just fine and while I was in the gearbox I also did a few other recommended tasks as I recall.
On a related note, I read a story recently about a spring replacement task that went very bad. Apparently, the owner did not disconnect the battery completely from the bike before pulling the starter, a dead short to ground ensued and the bike was irrepairably damaged.
Art