I talked to Kymco before I could get the manuel down loaded, so we never spoke of it. I know it had some lube on the boss as I could see it. I have not taken the inner pulley half out of the box yet, (its still in the car), maybe it comes pre lubed? I will let you know. But Kymco and the manuel do not talk about grease. So I am thinking since the boss is steal, and the pulley is alloy, maybe it's not needed? Hoolander makes a good point about the rubber seal. Maybe that's all it's for, (the seal)? If it is not pre lubed, then I will ad a dab, work boss back and forth, wipe off excess, and install as per manuel. And then all I can do is ride it and hope it does not do it again. I'll keep u all up-dated.