I am wondering if reving in netral can go over 3000-4000 ? maybe there is a limitation, don't remember.
About the vibration, could it be pads/discs that have been used and (over)heated ?
It happens on brembos after some hard braking, maybe you should give it a clean (especially the holes, use a wire to get into them).
No warnings ? no other symptoms than vibration ?
Reving slow only in neutral ? or on the raod too ?
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