I bought a NOS Suntour Ultra-6 off the bay. It looks great, and although I have yet to test it on a bike, it seems to be perfectly functional.

The only problem is the noise. If I hold it in my hand and shake it, I can hear the bearings. It sounds like a maraca. I've never had a freewheel do this before.

Do I need to get some oil in there or something?