In the past we had some issues. Gordon (deerslayer) comes to mind he just resurrected and upgraded his 750 from turbo, oil pump, RV & clutch basket. Started smoking about six months later so he sent me the turbo back. The inside was destroyed in the bores and turbine journal from debris. Suggest he take the oil pan off and it was full of eraser size particle of clutch damper material from the ones he got think AU and caused all the damage.
Good luck!