Here is the technical diagram for the water pump assembly from the MC28 service manual, which is generally much clearer than the photos they used in the MC16-21 service manual. The setup for all models is the same.
http://nsr250.net/forums/members/nsr250r_manual_mc28/index.php#p=90
The open end of the inner seal [part #] faces the bearing.
*NOTE: You must be logged in to the forums to access the Service Manuals.
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Andy.
NSR-WORLD.COM
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