My gut feeling is that its probably still plenty strong enough - but I would want to see several others survive a couple of seasons' racing before using them myself.
I would tend to agree, working on the assumption that Yamaha probably over engineered the hubs in the first place allowing for use and abuse over many years. The hub's longevity, reliability and renowned lightweight and braking performance is testimony of the engineers skill and the built-in fudge factor. But using the advantages/disadvantages and the probability/severity equation, I wonder if the risk is worth the 250-300grams
, even allowing for the fact that weight savings is done in grams and not in kilos.