I have tried to follow as close as I could, all the various threads on this subject.
I can't recall (or maybe its just implied) if Yamaha ever used this switch on other model bikes.
Since I couldn't remember anyone mentioning this, I did a quick search and came up with this.
Clicky
I cross checked some of the models with the parts fiche(sp) from our FAQ page and the numbers match.
I wonder if there have been failures with those various models like what we are seeing?
If not, is it our bike itself that causes the failures with excessive voltage, dirt slinging or whatever?
I know this guess was put on the table sometime ago...a bad batch of switches.
I'm putting money on the last, though the dirt is a strong force. We've seen failure to start from aggressive washing and I wonder if there is a common denominator amongst those that have reported failure.
Road conditions, farkle installs or even how the bike is stored day to day (inside/outside, covered or not).
Whatever the outcome, it should be interesting and hopefully prove some of the thoughts correct.