My mains went last year in my 03 because they were rusty from sitting around too, the guy I bought it from hadnt used it in close to a year, if this is what caused yours to fail it will be easy to spot the bearings will be rusty.
Since we're talking about crank bearings rusting I've heard running amsoil dominator will cause this if your bike sits around for a long time between rides, it has no anti corrosion additives, its a non issue if the bike gets used fairly often tho, theres even a disclaimer on the botte to cover amsoil but lol.
Every owner of my bike ran dominator, I still run it but my bike doesnt go more than a couple of weeks between rides, if im ever going to store it for long I will fog the motor with a can of that engine fog stuff to keep it from rusting.
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