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Ok, I bought a '94 SL650 back in June and since then I've noticed a roaring sound that has gotten progressively louder. It sounds like either dry bearings or some that are going bad. I think I've figured out that the ski has an updated coupler on it due to the fact that mine has a rubber core, but there are NO grease fittings and I'm afraid that if I don't get some grease on those bearings that are either dry or failing, that I might run into other costly problems. Does anyone have any suggestions?