Not sure whjy they never upgraded those bearings, but might be a good time to get an aftermarket if things are chewed up too bad. Taper bearing about bullet proof, but a dual row carrier are also a huge improvement.
Also a good reason not to get carried away with the pressure washer, those seals are no match for 1000psi plus.
08 DS450 (dasa)
08 ktm 450xc
00 ktm 300
"A dead thing can go with the stream, but only a living thing can go against it." G. K. Chesterton