This 94 RM 125 had a serious problem of water getting into the oil. I pulled the clutch cover and the transmission fluid in the gear box looked like pepto-bismol. I assumed the water pump seal was to blame, and I was correct. Once the seal was removed, it was evident it was leaking because the 2 bearings behind the seal were rusted and seized. These bearings should never be in contact with water unless the seal is leaking.
With the installation of the new seal and bearings, the bike was ready to go.