i beat the ***** out of my 400, and im still riding stock spindles (original from 2000) the only thing that hasnt been bent or broken on my bike. i ride trails hard, mostly in PSF in mass Rocky as hell, bend rims all the time and get the same wobble as you
.
could be the tire, only other culprit is the rim.
Got trails?
2000 400ex, powerbomb, FMF powercore IV pipe, +2 Dura blue, AC pro-peg nerfs, 14 tooth renthal sprocket, gncc fronts / mudsharks rear, on baja's, wiseco 416 10:1 piston, hotcams stage 1, crf cam chain, valve job, xr CDI, fox floats front, elka dual rate remote rear,
"if everything seems to be going well then you obviously overlooked a major detail"