If properly looked after, the seal will go long before the bearing(s). As ricey3 says though, hard starting is often a classic symptom.

The centre seal [that commonly fails] on an MC21/28 is basically just a big 60mm O-ring.

Edited for increased clarity.
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Andy.
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Last edited by Andy on Tue Feb 10, 2009 8:55 pm; edited 1 time in total