As far as I can remember the thread is normal, I really couldnt be 100% sure though. I do remember that I had severe trouble getting mine off too!!! A huge bar to swing on did it for me, I take it you have locked the crank at the small ends??
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NSR250R MC21 (NEARLY SOLD!!)
VFR400R NC30 (SOLD)
Santa, please bring me a NSR500 and a SP-2 next year. Pleeeeease....