Never opened up a starter motor, but have got quite experienced at removing and replacing one (don't ask) so these observations might help (others on this forum have more knowledge that me and may wish to correct any of the following) -
The 2 valve engines up to 2005, including the 750 that the 800 was developed from, need the starter to be removed in order to get the drive pinion off the shaft - I don't think that you can overhaul it without completing that step.
To remove the starter motor requires removal of the alternator cover, which will have to come off anyway if the problem is anything to do with the starter clutch. This requires an extractor and removing ALL the bolts before using it (including the hidden one behind the clutch actuator).
Good luck
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