McCarty also pointed out that, outside his team, there isn't any way to know exactly what strains the transmissions are under. Aftermarket electronic shift aids can be installed, properly or improperly, oil outside factory spec can be used, and any number of other abuses aside from the usual (already severe) stress of track riding. That, in a nutshell, is why Yamaha is using, "an abundance of caution" in the case of this transmission recall. If an R1 is being used casually and properly, the chances of a part failing are likely lessened. Considering Yamaha doesn't know who will take the bike to a track, shift improperly, or otherwise raise the chances of internal failure, it would rather tear each one down and replace the gears.